69 results on '"Yoon-Seok, Youm"'
Search Results
2. Synovial fluid levels of TWEAK and matrix metalloproteinase 1 in patients with osteoarthritis, and associations with disease severity
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Il-Yeong Hwang, Yoon-Seok Youm, Sung-Do Cho, Seung-Won Choi, Mun-Hee Bae, Seon-Jae Park, and Han-Wook Kim
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Orthopedic surgery ,RD701-811 - Abstract
Purpose: This study assessed the levels of soluble tumor necrosis factor–like weak inducer of apoptosis (TWEAK) and matrix metalloproteinase 1 (MMP-1) in the synovial fluid from osteoarthritic knees to determine their role as well as the relationship between these levels and the severity of osteoarthritis (OA). Methods: Synovial fluid was obtained from 44 knees of 40 patients. The Kellgren–Lawrence (KL) grade was measured using radiograph. The concentration of TWEAK and MMP-1 in the synovial fluid was assessed by enzyme-linked immunosorbent assay. The underlying inflammatory factors (erythrocyte sedimentation rate and C-reactive protein) were also measured. We analyzed the correlation between the factors measured. In addition, the samples were subdivided into three groups according to OA severity using the KL grade, and the differences in TWEAK and MMP-1 levels between groups were analyzed. Results: The TWEAK and MMP-1 levels in the synovial fluid showed a positive correlation with each other. The TWEAK and MMP-1 levels were compared between the three groups according to the KL grade, and the levels showed a significant difference. A post hoc test demonstrated that the group with advanced OA showed a lower concentration of both factors when compared to groups with early OA. Conclusion: The concentration of TWEAK and MMP-1 in the synovial fluid were relatively high in the early stage of OA, and the levels decreased as the OA progressed.
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- 2018
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3. The Prevalence of Vitamin D Deficiency in Patients Undergoing Total Knee Arthroplasty: A Propensity Score Matching Analysis
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Young-Dae, Jeon, Sung-Do, Cho, Yoon-Seok, Youm, Joon-Yeon, Song, Kyung-Joo, Lee, and Ki-Bong, Park
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Prevalence ,Humans ,Orthopedics and Sports Medicine ,Obesity ,Vitamins ,Vitamin D ,Arthroplasty, Replacement, Knee ,Propensity Score ,Vitamin D Deficiency - Abstract
Purpose We investigated and compared the serum 25-OH vitamin D [25(OH)D] level and prevalence of vitamin D deficiency (VDD) between patients who underwent total knee arthroplasty (TKA) and healthy participants through a matched analysis. Methods The unmatched case group consisted of 824 patients who underwent TKA and the unmatched control group 2,794 healthy participants examined at our institution. The control group was matched on the various characteristics—sex, age, weight, body mass index (BMI), blood chemistry, and season of sampling—through propensity score matching (PSM). After PSM, 501 and 721 patients were matched in the case and control group, respectively. Levels of blood chemistry including 25(OH)D were examined and VDD was defined as Results The average serum 25(OH)D level was significantly lower in the OA group (15.3 ng/mL) than that in the control group (19.9 ng/mL, p Conclusions The patients who underwent TKA had lower serum 25(OH)D level and higher VDD prevalence compared to the healthy participants who matched using PSM. There were no differences in VDD rates by sex or obesity and the VDD prevalence was more than 70% during all season. Therefore, in patients undergoing TKA, general attention to VDD is required regardless of sex, obesity, and season. Summary Serum 25-OH vitamin D [25(OH)D] level and vitamin D deficiency (VDD) prevalence were compared between patients undergoing total knee arthroplasty and healthy individuals. The differences in serum 25(OH)D level and VDD prevalence were significant between the two groups after propensity score matching
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- 2022
4. Does posterior tibial slope affect the results of conservative treatment for anterior cruciate ligament tears?
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Ki Bong Park, Sung Do Cho, Hee Yoon Chung, Yoon-Seok Youm, and Doo Guen Yang
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Adult ,Male ,medicine.medical_specialty ,Knee Joint ,Anterior cruciate ligament ,medicine.medical_treatment ,Radiography ,Conservative Treatment ,Group A ,Group B ,medicine ,Humans ,Orthopedics and Sports Medicine ,Rehabilitation ,Anterior Cruciate Ligament Reconstruction ,Tibia ,business.industry ,Anterior Cruciate Ligament Injuries ,Surgery ,medicine.anatomical_structure ,Orthopedic surgery ,Tears ,Female ,business ,Body mass index - Abstract
To evaluate the association between posterior tibial slope (PTS) and the short-term results of conservative treatment for the patients with anterior cruciate ligament (ACL) tears. Thirty-seven patients (37 knees: male 33, female 4) who were managed with the same treatment protocols for ACL tears were included. All patients applied ACL brace and underwent standardized rehabilitation protocol. Group A consisted of 14 patients with successful results after conservative management and group B consisted of 23 patients who received operative treatments due to failed conservative management. For each group, a plain radiograph was used to measure the PTS. The demographic data of patients and differences of PTS between each group were analyzed. The mean age was 33.2 years in group A and 29.7 years in group B, respectively (p = 0.8). There was no significant difference between each group in terms of gender, body mass index, and injury mechanism. There was no significant difference between each group in the classification according to the isolated or combined injury (p = 0.83). The mean PTS was 8.3° in group A and 10.2° in group B. The mean PTS in group A was significantly lower than that in group B (p = 0.03). The patients with successful results after conservative management had a lower mean PTS than those with failed conservative treatment (8.3° vs. 10.2°, p = 0.03). The failure of conservative treatment after ACL tear was found to be associated with increased PTS.
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- 2020
5. Distal Femur Fractures Treated with Distal Femoral Locking Plate Fixation: A Retrospective Study of One Year Mortality and Risk Factors
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Kwang-Hwan Jung, Yoon-Seok Youm, Seung-Hyun Jung, Jae-Min Oh, and Ki Bong Park
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- 2023
6. Fitness of lospa® knee prosthesis with distal femoral cut surfaces of Korean women in total knee arthroplasty
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Young-Jin Choi, Sung-Do Cho, Yoon-Seok Youm, Yong-Tae Joo, and Moon-Hee Bae
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Sports medicine ,RC1200-1245 - Published
- 2017
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7. Iatrogenic Medial Collateral Ligament Injury by Valgus Stress During Arthroscopic Surgery of the Knee
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Sung Do Cho, Kwang Hwan Jung, Sun Hwan Kwon, Yoon-Seok Youm, and Woo Young Jin
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Adult ,Male ,musculoskeletal diseases ,medicine.medical_specialty ,Knee Joint ,medicine.medical_treatment ,Radiography ,Medial Collateral Ligament, Knee ,Physical examination ,Unnecessary Procedures ,Arthroscopy ,Young Adult ,03 medical and health sciences ,Postoperative Complications ,0302 clinical medicine ,medicine ,Humans ,Orthopedics and Sports Medicine ,Aged ,Retrospective Studies ,030222 orthopedics ,Medial collateral ligament ,Braces ,medicine.diagnostic_test ,biology ,business.industry ,Magnetic resonance imaging ,Retrospective cohort study ,030229 sport sciences ,Middle Aged ,Prognosis ,musculoskeletal system ,biology.organism_classification ,Magnetic Resonance Imaging ,Brace ,Surgery ,Valgus ,Female ,Stress, Mechanical ,business ,Splint (medicine) ,human activities - Abstract
Purpose To evaluate the radiographic and clinical follow-up results of iatrogenic medial collateral ligament (MCL) injuries caused by valgus stress during arthroscopic surgery of the knee. Methods This study retrospectively evaluated 15 knees in 15 patients (8 female and 7 male patients), with a mean age of 58 years (range, 45-66 years), with iatrogenic MCL injuries caused by valgus stress during arthroscopic surgery of the knee. All patients were treated conservatively without an immobilizer or brace. The mean follow-up period was 24 months (range, 18-51 months). Evaluations included magnetic resonance imaging immediately postoperatively, as well as physical examinations and valgus stress radiographs (at 0° and 30° of knee flexion) 6 weeks after surgery and at final follow-up. Results Postoperative magnetic resonance imaging in all patients showed increased signal intensity, swelling, and partial loss of continuity at the meniscofemoral portion of the MCL. Physical examination showed mild tenderness in only 1 patient after 6 weeks and none at final follow-up. Valgus stress tests and valgus stress radiographs showed no significant differences between the injured and uninjured knees at 6 weeks postoperatively and at final follow-up (P > .05). Conclusions Iatrogenic MCL injuries during arthroscopic knee surgery could be treated successfully without a splint or brace. Level of Evidence Level IV, prognostic case series.
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- 2019
8. Anterior knee pain after total knee arthroplasty
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Young-Jin Choi, Sung-Do Cho, Yoon-Seok Youm, Yong-Tae Joo, and Moon-Hee Bae
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Sports medicine ,RC1200-1245 - Published
- 2017
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9. How the results of conservative treatment for ACL tears are different by posterior tibial slope?
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Yoon Seok Youm, Sung Do Cho, Young Jin Choi, Yong Tae Joo, and Moon Hee Bae
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Sports medicine ,RC1200-1245 - Published
- 2017
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10. Enhanced Reality Showing Long-Lasting Analgesia after Total Knee Arthroplasty: Prospective, Randomized Clinical Trial
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Dae Kwon Park, Sung Do Cho, Yoon-Seok Youm, Chang Ho Hwang, and Kyo-in Koo
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Long lasting ,Male ,Visual analogue scale ,medicine.medical_treatment ,Analgesic ,Total knee arthroplasty ,lcsh:Medicine ,Article ,law.invention ,03 medical and health sciences ,0302 clinical medicine ,Randomized controlled trial ,law ,medicine ,Humans ,030212 general & internal medicine ,Prospective Studies ,Range of Motion, Articular ,Prospective cohort study ,Arthroplasty, Replacement, Knee ,lcsh:Science ,Aged ,Pain, Postoperative ,Multidisciplinary ,business.industry ,Virtual Reality Exposure Therapy ,lcsh:R ,Middle Aged ,Arthroplasty ,Treatment Outcome ,Anesthesia ,Female ,lcsh:Q ,Analgesia ,Range of motion ,business ,030217 neurology & neurosurgery - Abstract
To overcome the limitation of short-term efficacy of virtual reality (VR), an enhanced reality (ER) analgesia, (combination of the VR, real-time motion capture, mirror therapy [MT]) involving a high degree of patients’ presence or embodiment was explored. Patients, who underwent unilateral total knee arthroplasty (TKA), received ER analgesia. The duration was 5 times a week, for 2 weeks for one group and 5 times a week, for 1 week in the other. Visual Analogue Scale (VAS) at rest and during movement, active knee range of motion (ROM) for flexion and extension were measured repeatedly. After screening 157 patients, 60 were included. Pre-interventional evaluation was performed at 6.7 days and ER was initiated at 12.4 days after surgery. Evaluation was performed at 5, 12, 33 days after the initiation of ER. Analgesia in the 2 week therapy group was effective until the third evaluation (p = 0.000), whereas in the other group, it was effective only until the second evaluation (p = 0.010). Improvement in ROM in the 2 week group was also maintained until the third evaluation (p = 0.037, p = 0.009). It could lay the foundations for the development of safe and long-lasting analgesic tools.
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- 2018
11. Pigmented villonodular synovitis after anterior cruciate ligament reconstruction using active bioprosthetic composite artificial ligament
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Sung Do Cho, Yoon-Seok Youm, Sun Jae Park, and Hyung In Cho
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musculoskeletal diseases ,Male ,medicine.medical_specialty ,Anterior cruciate ligament reconstruction ,Knee Joint ,medicine.medical_treatment ,Anterior cruciate ligament ,Immunology ,Synovitis, Pigmented Villonodular ,03 medical and health sciences ,0302 clinical medicine ,Rheumatology ,Synovectomy ,Internal medicine ,medicine ,Immunology and Allergy ,Humans ,030212 general & internal medicine ,030203 arthritis & rheumatology ,medicine.diagnostic_test ,business.industry ,Magnetic resonance imaging ,Prostheses and Implants ,Middle Aged ,musculoskeletal system ,medicine.disease ,Surgery ,medicine.anatomical_structure ,Knee pain ,Pigmented villonodular synovitis ,Ligament ,medicine.symptom ,business ,human activities - Abstract
Pigmented villonodular synovitis (PVNS) is a proliferative disease that develops in the synovium of joints, especially the knee joints. A 52-year-old man visited our hospital with left knee pain, swelling and symptoms of collapse. Twenty-one years earlier, he had undergone anterior cruciate ligament (ACL) reconstruction using an active bioprosthetic composite (ABC) as an artificial ligament. T1 and T2 weighted magnetic resonance imaging of the knee joint showed rupture of the ABC ligament and low signal intensity of hyperplastic synovium. Arthroscopic total synovectomy without ACL reconstruction was performed and the lesion was histopathologically diagnosed as diffuse PVNS. Clinical outcomes included good pain relief and no recurrence of the disease after 5 years of follow-up.
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- 2019
12. Preemptive Femoral Nerve Block Could Reduce the Rebound Pain After Periarticular Injection in Total Knee Arthroplasty
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Seung-Hyun Jung, Hye Yong Cho, Sung Do Cho, Yoon-Seok Youm, Kwang Ho Kim, and Chang Ho Hwang
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Male ,medicine.medical_specialty ,Opioid consumption ,Visual analogue scale ,Postoperative pain ,Total knee arthroplasty ,Walking ,Injections, Intra-Articular ,03 medical and health sciences ,0302 clinical medicine ,030202 anesthesiology ,Humans ,Medicine ,Orthopedics and Sports Medicine ,Postoperative Period ,Prospective Studies ,Range of Motion, Articular ,Arthroplasty, Replacement, Knee ,Aged ,Pain Measurement ,Pain, Postoperative ,030222 orthopedics ,Electromyography ,business.industry ,Nerve Block ,Single injection ,Femoral nerve block ,Surgery ,Analgesics, Opioid ,Anesthesia ,Female ,Range of motion ,business ,Periarticular injection ,Femoral Nerve - Abstract
Background We evaluated the effectiveness of postoperative pain management using intraoperative periarticular injection (PAI) and/or electromyography-guided preoperative femoral nerve block (FNB) in knees undergoing total knee arthroplasty (TKA). Methods This study included 90 patients (90 knees) who underwent primary TKA. Thirty patients received a single injection of electromyography-guided FNB, 30 received intraoperative PAI, and 30 received both. Pain at rest and while moving was evaluated by a visual analog scale (VAS) at 0, 4, 8, 24, and 48 hours. Postoperative range of motion, time to walking, amount of opioid consumption, and complications were analyzed. Results VAS immediately after surgery was significantly higher in the FNB group than in the PAI and combined groups, but did not differ significantly in the latter 2 groups. VAS after 4 and 8 hours showed similar results. VAS after 24 hours was significantly higher in the PAI than in the FNB and combined groups. After 48 hours, there were no differences among the 3 groups. Total opioid consumption was lower in the combined than in the FNB and PAI groups. Postoperative range of motion and time to walking were similar in the 3 groups. Conclusion PAI was more effective than FNB during the early (0-8 hours) postoperative period after TKA. Patients treated with PAI, however, experienced rebound pain at 24 hours. The combination of PAI and FNB may provide greater postoperative pain management than either alone for the first 24 hours after TKA.
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- 2016
13. Patterns and Influencing Factors of Medial Meniscus Tears in Varus Knee Osteoarthritis
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Yoon-Seok Youm, Sung Do Cho, Jong-Hyun Kim, Kwang Ho Kim, and Hye Yong Cho
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musculoskeletal diseases ,Medial meniscus ,Total knee arthroplasty ,Osteoarthritis ,03 medical and health sciences ,0302 clinical medicine ,medicine ,Orthopedics and Sports Medicine ,In patient ,Knee ,Orthodontics ,030222 orthopedics ,business.industry ,030229 sport sciences ,Varus ,Varus knee ,medicine.disease ,musculoskeletal system ,eye diseases ,body regions ,medicine.anatomical_structure ,Tear ,Tears ,Surgery ,Original Article ,sense organs ,business ,human activities - Abstract
Purpose To investigate the patterns of medial meniscus (MM) tears in patients with varus knee osteoarthritis who underwent total knee arthroplasty and analyze the factors that could affect MM tears. Materials and Methods The patients (365 knees, 268 patients) were classified into three groups; group I with MM posterior horn (PH) tear only; group II with MM root tear only; and group III with MMPH plus root tear. The following factors were evaluated: age, gender, body mass index, varus deviation of the mechanical axis, medial proximal tibial angle, posterior tibial slope (PTS), and anterior cruciate ligament (ACL) integrity (normal, degeneration, and tear or absence). Results MM tears were identified in all knees. The patterns of the combined MMPH tears in group III were less complex than those in group I. Varus deviation and PTS were significantly greater in group III than groups I and II. In group III, there were significantly more cases of ACL tear or absence than groups I and II. The others showed no differences among three groups. Conclusions Severe varus knee osteoarthritis was always accompanied by MM tears. Risk factors for MMPH plus root tears were severe varus deformity, great PTS, and ACL tear or absence.
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- 2016
14. Bilateral Hypoplasia of the Medial and Lateral Menisci
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Tae Wook Kang, Yoon-Seok Youm, Sung-Do Cho, and Hye-Yong Cho
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musculoskeletal diseases ,Case Report ,Meniscus (anatomy) ,03 medical and health sciences ,0302 clinical medicine ,Bilateral hypoplasia ,medicine ,Knee ,Meniscus ,Orthopedics and Sports Medicine ,Lateral meniscus ,Hyperextension injury ,030222 orthopedics ,medicine.diagnostic_test ,business.industry ,Magnetic resonance imaging ,030229 sport sciences ,Anatomy ,musculoskeletal system ,medicine.disease ,Hypoplasia ,body regions ,medicine.anatomical_structure ,Knee pain ,Surgery ,medicine.symptom ,business ,human activities - Abstract
Hypoplasia of the meniscus is a very rare congenital abnormality, with only a few cases reported to date. A 9-year-old girl visited our hospital due to lateral knee pain following a hyperextension injury to the left knee. Magnetic resonance imaging showed hypoplasia of the medial and lateral menisci, as well as a posterior horn tear of the lateral meniscus, in both knee joints. To our knowledge, this is the first report of a patient with hypoplasia of the medial and lateral menisci in both knee joints.
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- 2017
15. Synovial fluid levels of TWEAK and matrix metalloproteinase 1 in patients with osteoarthritis, and associations with disease severity
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Seung Won Choi, Seon-Jae Park, Il-Yeong Hwang, Hanwook Kim, Sung-Do Cho, Mun-Hee Bae, and Yoon-Seok Youm
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Male ,0301 basic medicine ,Pathology ,medicine.medical_specialty ,Enzyme-Linked Immunosorbent Assay ,Osteoarthritis ,Matrix metalloproteinase ,03 medical and health sciences ,0302 clinical medicine ,Disease severity ,lcsh:Orthopedic surgery ,Synovial Fluid ,Humans ,Medicine ,Synovial fluid ,Inducer ,030203 arthritis & rheumatology ,business.industry ,Cartilage ,Cytokine TWEAK ,Middle Aged ,Osteoarthritis, Knee ,medicine.disease ,lcsh:RD701-811 ,030104 developmental biology ,medicine.anatomical_structure ,Apoptosis ,Female ,Surgery ,Tumor necrosis factor alpha ,Matrix Metalloproteinase 1 ,business ,Biomarkers - Abstract
Purpose: This study assessed the levels of soluble tumor necrosis factor–like weak inducer of apoptosis (TWEAK) and matrix metalloproteinase 1 (MMP-1) in the synovial fluid from osteoarthritic knees to determine their role as well as the relationship between these levels and the severity of osteoarthritis (OA). Methods: Synovial fluid was obtained from 44 knees of 40 patients. The Kellgren–Lawrence (KL) grade was measured using radiograph. The concentration of TWEAK and MMP-1 in the synovial fluid was assessed by enzyme-linked immunosorbent assay. The underlying inflammatory factors (erythrocyte sedimentation rate and C-reactive protein) were also measured. We analyzed the correlation between the factors measured. In addition, the samples were subdivided into three groups according to OA severity using the KL grade, and the differences in TWEAK and MMP-1 levels between groups were analyzed. Results: The TWEAK and MMP-1 levels in the synovial fluid showed a positive correlation with each other. The TWEAK and MMP-1 levels were compared between the three groups according to the KL grade, and the levels showed a significant difference. A post hoc test demonstrated that the group with advanced OA showed a lower concentration of both factors when compared to groups with early OA. Conclusion: The concentration of TWEAK and MMP-1 in the synovial fluid were relatively high in the early stage of OA, and the levels decreased as the OA progressed.
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- 2018
16. Does Posterior Tibial Slope Affect Graft Rupture Following Anterior Cruciate Ligament Reconstruction?
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Sung Do Cho, Han Wook Kim, Chae Chil Lee, Yoon-Seok Youm, Mun Hee Bae, Seung-Hyun Jung, and Seon Jae Park
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Adult ,Male ,Reoperation ,medicine.medical_specialty ,Anterior cruciate ligament reconstruction ,Adolescent ,Anterior cruciate ligament ,medicine.medical_treatment ,03 medical and health sciences ,Young Adult ,0302 clinical medicine ,Postoperative Complications ,Risk Factors ,medicine ,Humans ,Orthopedics and Sports Medicine ,In patient ,Tibia ,Young adult ,Retrospective Studies ,Rupture ,030222 orthopedics ,Anterior Cruciate Ligament Reconstruction ,business.industry ,Anterior Cruciate Ligament Injuries ,Case-control study ,Retrospective cohort study ,030229 sport sciences ,Middle Aged ,musculoskeletal system ,Surgery ,surgical procedures, operative ,medicine.anatomical_structure ,Case-Control Studies ,Female ,business ,Body mass index - Abstract
The purpose of this study was to evaluate the association between posterior tibial slope (PTS) and anterior cruciate ligament (ACL) graft rupture in patients who have undergone ACL reconstruction by comparing results in patients who experienced graft rupture and a matched control group.The study included 64 knees of 64 patients (58 men and 6 women), of mean age 31 years (range, 18-60 years) who underwent revision ACL reconstruction for ACL graft rupture, as well as a control group without ACL graft rupture matched for age, sex, body mass index (BMI), and left or right side. The mean time to failure in study group was 48.5 months, and after revision surgeries, the mean follow-up period was 37.7 months. The graft used for the primary surgery was autograft in 3 patients (4.7%) and allograft in 49 patients (76.6%). The type of graft could not be confirmed in the remaining 12 patients (18.7%). PTS was measured on plain radiographs and compared in the 2 groups.Mean PTS was significantly higher in patients with (13.2° ± 2.5°; range, 8.5°-18.2°) than without (10.9° ± 3.1°; range, 4.9°-13.6°) rerupture (P.01). When mean PTS was compared in the 37 patients who underwent primary surgery by the same surgeon, it was significantly higher in patients with (13.5° ± 2.5°; range, 8.5°-18.2°) than without (11.1° ± 2.9°; range, 5.1°-13.6°) rerupture (P.01). PTS in patients with rerupture was not significantly associated with age, gender, BMI, and right or left side. The odds ratio of ACL graft rupture in knees with PTS ≥12° was 4.52 (P.001).This study showed that mean PTS was significantly greater in patients with than without noncontact ACL graft rerupture (13.2° vs 10.9°, P.01). The failure of ACL reconstruction appears to be associated with increased PTS, with PTS ≥12° a risk factor for the failure of ACL reconstruction.Level III, retrospective comparative study.
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- 2017
17. Anterior knee pain after total knee arthroplasty
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Yong-Tae Joo, Sung-Do Cho, Moon-Hee Bae, Yoon-Seok Youm, and Youngjin Choi
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musculoskeletal diseases ,030222 orthopedics ,medicine.medical_specialty ,business.industry ,Anterior knee pain ,Rehabilitation ,Total knee arthroplasty ,Physical Therapy, Sports Therapy and Rehabilitation ,030229 sport sciences ,musculoskeletal system ,Surgery ,03 medical and health sciences ,0302 clinical medicine ,medicine ,Orthopedics and Sports Medicine ,lcsh:Sports medicine ,business ,lcsh:RC1200-1245 - Published
- 2017
18. How the results of conservative treatment for ACL tears are different by posterior tibial slope?
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Moon Hee Bae, Yong Tae Joo, Yoon-Seok Youm, Youngjin Choi, and Sung Do Cho
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musculoskeletal diseases ,medicine.medical_specialty ,business.industry ,musculoskeletal, neural, and ocular physiology ,Rehabilitation ,Physical Therapy, Sports Therapy and Rehabilitation ,musculoskeletal system ,Surgery ,Conservative treatment ,surgical procedures, operative ,medicine ,Tears ,Orthopedics and Sports Medicine ,lcsh:Sports medicine ,business ,lcsh:RC1200-1245 ,human activities - Published
- 2017
19. Total Knee Arthroplasty Using a Posterior Cruciate Ligament Sacrificing Medial Pivot Knee: Minimum 5-year Follow-up Results
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Hye Yong Cho, Sung Do Cho, Seon Ho Lee, and Yoon-Seok Youm
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musculoskeletal diseases ,medicine.medical_specialty ,5 year follow up ,business.industry ,medicine.medical_treatment ,Total knee arthroplasty ,Medial pivot ,musculoskeletal system ,Arthroplasty ,Surgery ,medicine.anatomical_structure ,Radiological weapon ,Posterior cruciate ligament ,Medial Pivot ,medicine ,Original Article ,Knee ,Orthopedics and Sports Medicine ,business ,human activities - Abstract
Purpose To evaluate minimum 5-year follow-up clinical and radiological results of total knee arthroplasty (TKA) using a posterior cruciate ligament sacrificing (PS), non-substituting Advance Medial Pivot Knee. Materials and Methods One hundred and twenty knees in 80 patients who could be followed up for more than 5 years after TKA using the PS Advance Medial Pivot Knee were evaluated retrospectively. The evaluations included the preoperative and postoperative range of motion (ROM), tibiofemoral angle, Knee Society (KS) knee and function scores, and Western Ontario and McMaster Universities Arthritis Index (WOMAC) score. The Kaplan-Meier method was used for survival analysis. Results The ROM increased from a preoperative mean flexion contracture of 7.6° and further flexion of 115.1° to a postoperative mean flexion contracture of 1.5° and further flexion of 120.5°. The tibiofemoral angle was changed from 4.6° varus preoperatively to 5.8° valgus postoperatively. The KS knee and function scores as well as WOMAC score significantly improved after surgery (p
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- 2014
20. 3D CT analysis of femoral and tibial tunnel positions after modified transtibial single bundle ACL reconstruction with varus and internal rotation of the tibia
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Jin Eo, Jae-Ryong Cha, Sung-Do Cho, Kwang-Hwan Jung, Yoon-Seok Youm, and Ki-Jae Lee
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Adult ,Male ,musculoskeletal diseases ,Adolescent ,Knee Joint ,Anterior cruciate ligament reconstruction ,Anterior cruciate ligament ,medicine.medical_treatment ,Condyle ,Tendons ,Arthroscopy ,Young Adult ,Imaging, Three-Dimensional ,medicine ,Humans ,Orthopedics and Sports Medicine ,Femur ,Tibia ,Orthodontics ,Anterior Cruciate Ligament Reconstruction ,medicine.diagnostic_test ,business.industry ,Anatomy ,Middle Aged ,Allografts ,musculoskeletal system ,medicine.anatomical_structure ,Female ,Tomography ,Tomography, X-Ray Computed ,business - Abstract
Introduction We analyzed the location of femoral and tibial tunnels by three-dimensional (3D) CT reconstruction images after modified transtibial single bundle (SB) anterior cruciate ligament (ACL) reconstruction, creating a femoral tunnel with varus and internal rotation of the tibia. Material and methods Data from 50 patients (50 knees) analyzed by 3D CT after modified transtibial SB ACL reconstructions were evaluated. 3D CT images were analyzed according to the quadrant method by Bernard at the femur and the technique of Forsythe at the tibia. Results The mean distance of the femoral tunnel center locations parallel to the Blumensaat's line was 29.6% ± 1.9% along line t measured from the posterior condylar surface. The mean distances perpendicular to the Blumensaat's line were 37.9% ± 2.5% along line h measured from the Blumensaat's line. At the tibia, the mean anterior-to-posterior distance for the tunnel center location was 37.8% ± 1.2% and the mean medial-to-lateral distance was 50.4% ± 0.9%. Discussion The femoral and tibial tunnels after modified transtibial SB ACL reconstruction creating a femoral tunnel with varus and internal rotation of the tibia (figure-of-4 position) were located between the anatomical anteromedial and posterolateral footprints.
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- 2013
21. Symptomatic mucoid degeneration of the anterior cruciate ligament
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Sung-Do Cho, Yoon-Seok Youm, Jae-Ryong Cha, Kwang-Hwan Jung, and Chae-Chil Lee
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Adult ,Male ,musculoskeletal diseases ,medicine.medical_specialty ,Knee Joint ,Anterior cruciate ligament ,Humans ,Medicine ,Orthopedics and Sports Medicine ,Anterior Cruciate Ligament ,Pathological ,Aged ,business.industry ,Retrospective cohort study ,Middle Aged ,musculoskeletal system ,Surgery ,medicine.anatomical_structure ,Knee pain ,Concomitant ,Orthopedic surgery ,Female ,Joint Diseases ,medicine.symptom ,business ,Complication ,human activities - Abstract
Mucoid degeneration of the anterior cruciate ligament (ACL) is a little-known entity. The aim of this study was to detail the clinical, radiological, arthroscopic and pathological findings of this condition and to report clinical outcomes following arthroscopic partial excision of the ACL. Between 1999 and 2009, 80 knees in 78 patients were diagnosed as having mucoid degeneration of the ACL based on MRI and clinical findings, and subsequently underwent arthroscopic treatment. Of these, 68 knees in 66 patients, with a median age of 51 years (range, 35–75 years), were followed-up for at least one year. All patients had insidious onset of knee pain, while 56 knees (82 %) had associated extension deficits and 36 knees (53 %) had restricted flexion. MRI findings typically showed diffuse thickening and increased signal intensity of the ACL. Arthroscopic examination revealed notch impingement and bulging of hypertrophied ACL into lateral compartments. Associated lesions included meniscal tears in 33 knees and chondral lesions of at least Outerbridge grade 2 in 56 knees. All knees underwent arthroscopic partial excision of the hypertrophied ACL, with three undergoing preoperative and 30 undergoing concomitant meniscectomies. Pain relief was achieved in 58 of 62 knees (94 %) following partial excision of the ACL. Extension deficits were normalized in 49 of 56 knees (88 %), and restricted flexion was normalized in 33 of 36 affected knees (92 %). Four knees of four patients had postoperative symptoms of anterior instability. Pain and limitation of motion due to mucoid degeneration of the ACL can be improved by arthroscopic partial excision of the ACL with or without notchplasty. However, one potential complication is the development of postoperative symptoms of anterior instability. Retrospective study, Level IV.
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- 2012
22. Fitness of lospa® knee prosthesis with distal femoral cut surfaces of Korean women in total knee arthroplasty
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Moon-Hee Bae, Yong-Tae Joo, Yoon-Seok Youm, Youngjin Choi, and Sung-Do Cho
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medicine.medical_specialty ,Knee prosthesis ,business.industry ,Rehabilitation ,medicine ,Total knee arthroplasty ,Physical Therapy, Sports Therapy and Rehabilitation ,Orthopedics and Sports Medicine ,lcsh:Sports medicine ,business ,lcsh:RC1200-1245 ,Surgery - Published
- 2017
23. Can We Use the Posterior Condylar Off set as a Predictive Factor for Overhang of the Implant in Total Knee Arthroplasty?
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Sun-Ho Lee, Sung-Do Cho, Yoon-Seok Youm, Jin Eo, and Ki-Bong Park
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musculoskeletal diseases ,medicine.medical_specialty ,Total knee arthroplasty ,Condyle ,Distal femur ,stomatognathic system ,medicine ,Orthopedics and Sports Medicine ,Posterior condylar off set ,Orthodontics ,business.industry ,musculoskeletal system ,Aspect ratio ,Surgery ,Predictive factor ,Overhang ,Femoral diaphysis ,Orthopedic surgery ,Original Article ,Implant ,business ,human activities ,circulatory and respiratory physiology - Abstract
Purpose We tried to demonstrate whether the posterior condylar offset (PCO, the distance from the femoral diaphysis posterior cortex to the posterior condylar margin) and ratio (PCOR, dividing PCO by the maximum antero-posterior diameter of the distal femur) could be used as predictive factors for overhang of the implants or using gender implants in total knee arthroplasty (TKA). Materials and Methods One hundred and one women who underwent TKA using NexGen® (LPS) implants, were analyzed prospectively. After distal femoral resection, the mediolateral (ML) width was measured at four points (anterior, distal anterior, distal posterior and posterior) and compared with the ML width of the implant. The aspect ratio (AR, ML/AP ratio) and anterior/distal posterior ML width (Ant/DP) were calculated. Preoperative radiographic PCO and PCOR were measured. Differences of PCO, PCOR, AR and Ant/DP according to the size were analyzed and correlations between PCO, PCOR and AR were also analyzed. The patients were classified into two groups according to the presence of overhang, and differences of each parameter were compared between the two groups. Results The size of the implant was positively correlated PCO, not significantly correlated with PCOR, and negatively correlated with AR and Ant/DP. PCO and PCOR and AR showed no correlation with each other. PCO and PCOR were not significantly different between the two groups. However, AR and Ant/DP were statistically low in the group with overhang. Conclusions Preoperative radiographic PCO or PCOR could not be used as a predictive factor for overhang of the implants or using gender implants in TKA.
- Published
- 2011
24. What have we learned from LCS mobile-bearing knee system?
- Author
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Sung-Chan Ahn, Woo-Shin Cho, Yoon-Seok Youm, and Dong-Wook Sohn
- Subjects
Adult ,Male ,Reoperation ,medicine.medical_specialty ,Time Factors ,Prosthesis Design ,Severity of Illness Index ,Statistics, Nonparametric ,Condyle ,Total knee ,Arthritis, Rheumatoid ,Cohort Studies ,Postoperative Complications ,Low contact stress ,medicine ,Humans ,Orthopedics and Sports Medicine ,Tibial fracture ,Range of Motion, Articular ,Arthroplasty, Replacement, Knee ,Aged ,Retrospective Studies ,Aged, 80 and over ,Analysis of Variance ,business.industry ,Osteonecrosis ,Middle Aged ,Osteoarthritis, Knee ,Prosthesis Failure ,Surgery ,Radiography ,Treatment Outcome ,Orthopedic surgery ,Female ,Stress, Mechanical ,Mobile bearing ,Knee Prosthesis ,Range of motion ,business ,Follow-Up Studies ,Prosthesis Survival - Abstract
Three hundred and sixty-four low contact stress (LCS) total knee arthroplasties that could be followed up for more than 5 years were clinically and radiographically analyzed. The median postoperative Hospital for Special Surgery score improved from 56 (range 32-77) to 91 (range 64-100) points, but median range of motion did not change from 120° (range 50°-135°) to 120° (range 85°-135°). Complications occurred in 16 cases (4%), and included postoperative polyethylene dislocation and intraoperative tibial condylar fracture, while five knees (1%) required revision surgery due to mechanical reasons. The overall prosthesis survival rate was 91% at 12 years. Although the LCS mobile-bearing knee system has theoretical advantages in terms of wear and loosening, the problem of polyethylene dislocation, intraoperative tibial fracture, and radiolucent lines should be solved for long survival. The clinical relevance of this study is that the LCS system provided good clinical and survival results.
- Published
- 2010
25. Revision Anterior Cruciate Ligament Reconstruction: Analysis of the Causes of Failure, Associated Injuries and Clinical Results
- Author
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Sung-Do Cho, Seung-Woo Kang, Seung-Hyun Jung, Yoon-Seok Youm, Yong-Tae Joo, and Hye-Yong Cho
- Subjects
030222 orthopedics ,03 medical and health sciences ,medicine.medical_specialty ,0302 clinical medicine ,Anterior cruciate ligament reconstruction ,business.industry ,medicine.medical_treatment ,medicine ,030229 sport sciences ,business ,Surgery - Published
- 2018
26. Relationship between Mucoid Degeneration of the Anterior Cruciate Ligament and Posterior Tibial Slope in Patients with Total Knee Arthroplasty
- Author
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Sung-Do Cho, Yoon-Seok Youm, Seung-Hyun Jung, and Hye-Yong Cho
- Subjects
medicine.medical_specialty ,Radiography ,Anterior cruciate ligament ,medicine.medical_treatment ,Posterior tibial slope ,Group ii ,Total knee arthroplasty ,Osteoarthritis ,Arthroplasty ,Mucoid degeneration ,03 medical and health sciences ,0302 clinical medicine ,Medicine ,Orthopedics and Sports Medicine ,In patient ,Knee ,030222 orthopedics ,business.industry ,030229 sport sciences ,medicine.disease ,musculoskeletal system ,Surgery ,medicine.anatomical_structure ,surgical procedures, operative ,Original Article ,business ,human activities - Abstract
Purpose The purpose was to analyze the relationship between posterior tibial slope (PTS) and mucoid degeneration of the anterior cruciate ligament (ACL) in patients with total knee arthroplasty. Materials and Methods Four hundred and twenty-four patients (24 males and 400 females; 636 knees) who received total knee arthroplasty for osteoarthritis were included. Their mean age was 68.9 years (range, 48 to 88 years). The patients were classified into three groups according to the status of ACL; normal ACL group (group I), mucoid degeneration of ACL group (group II) and ruptured or absent ACL group (group III). Plain lateral radiographs were used to measure the PTS and the values were compared among groups. Results There were no significant differences with regard to gender, age and left-to-right side ratio among groups (p>0.05). The mean PTS was 9.9° (range, 0.6° to 20.1°) in group I (161 knees), 10.8° (range, 0.2° to 21.8°) in group II (342 knees) and 12.3° (range, 2° to 22.2°) in group III (133 knees), which showed significant differences (p
- Published
- 2015
27. Should the ‘no thumb technique’ be the golden standard for evaluating patellar tracking in total knee arthroplasty?
- Author
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Jae-Ho Woo, Yoon-Seok Youm, Ho-Youn Park, Woo-Shin Cho, and Byung Kwan Kim
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musculoskeletal diseases ,medicine.medical_specialty ,medicine.medical_treatment ,Total knee arthroplasty ,Osteoarthritis ,Thumb ,Prosthesis Design ,Lateral retinacular release ,Intraoperative Period ,Pneumatic tourniquet ,medicine ,Humans ,Orthopedics and Sports Medicine ,Prospective Studies ,Range of Motion, Articular ,Arthroplasty, Replacement, Knee ,Aged ,Subluxation ,business.industry ,Patella ,Middle Aged ,Osteoarthritis, Knee ,musculoskeletal system ,medicine.disease ,Arthroplasty ,Surgery ,body regions ,medicine.anatomical_structure ,Knee Prosthesis ,business ,Range of motion - Abstract
We checked intraoperative patellar tracking with both 'towel clip technique' and the 'no thumb technique' on 97 patients (167 knees) who underwent primary total knee arthroplasty to decide whether to do or not to do lateral retinacular release. Patellar tracking was assessed under pneumatic tourniquet with the no thumb technique first and re-evaluated with the towel clip technique. The tracking was graded as total contact, good contact, lateral contact and subluxation. The knees graded as total or good contact with the no thumb technique were classified into group A; those graded lateral contact or subluxation by the no thumb technique but total or good contact by the towel clip technique were classified into group B; and those graded lateral contact or subluxation by both techniques were classified into group C; in which lateral releases were performed. One hundred three, 53 and 11 knees were classified into groups A, B and C respectively. Of the 167 knees, 64 (38.3%) showed poor tracking (lateral contact or subluxation) with the no thumb technique alone. Re-evaluation of these knees with the towel clip technique significantly reduced the number with poor tracking to 11 (6.6%) knees requiring lateral retinacular release (p < 0.05). The patients were followed up for 1 year without any patella-related complications occurring. Assessment of the patellar tracking using only the no thumb technique may overestimate the need for lateral retinacular release. The use of the no thumb technique as a screening test, and re-evaluation with the towel clip technique may reduce unnecessary lateral retinacular release.
- Published
- 2011
28. The expression of vascular endothelial growth factor and Syndecan-4 in cartilage from osteoarthritic knees
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S. W. Choi, Y. J. Cho, J. S. Oh, Yoon-Seok Youm, and Sung-Do Cho
- Subjects
Cartilage, Articular ,Vascular Endothelial Growth Factor A ,Pathology ,medicine.medical_specialty ,Pilot Projects ,Osteoarthritis ,Matrix (biology) ,Chondrocyte ,Syndecan 1 ,Pathogenesis ,chemistry.chemical_compound ,Chondrocytes ,medicine ,Humans ,Orthopedics and Sports Medicine ,RNA, Messenger ,Cells, Cultured ,Aggrecanase ,Aged ,business.industry ,Reverse Transcriptase Polymerase Chain Reaction ,Cartilage ,Middle Aged ,Osteoarthritis, Knee ,medicine.disease ,Vascular endothelial growth factor ,medicine.anatomical_structure ,chemistry ,Gene Expression Regulation ,Surgery ,Female ,Syndecan-4 ,business - Abstract
Previous studies support the important role of vascular endothelial growth factor (VEGF) and syndecan-4 in the pathogenesis of osteoarthritis (OA). Both VEGF and syndecan-4 are expressed by chondrocytes and both are involved in the regulation of matrix metalloproteinase-3, resulting in the activation of aggrecanase II (ADAMTS-5), which is essential in the pathogenesis of OA. However, the relationship between VEGF and syndecan-4 has not been established. As a pilot study, we assayed the expression of VEGF and syndecan-4 in cartilage samples and cultured chondrocytes from osteoarthritic knee joints and analysed the relationship between these two factors. Specimens were collected from 21 female patients (29 knees) who underwent total knee replacement due to severe medial OA of the knee (Kellgren–Lawrence grade 4). Articular cartilage samples, obtained from bone and cartilage excised during surgery, were analysed and used for chondrocyte culture. We found that the levels of expression of VEGF and syndecan-4 mRNA did not differ significantly between medial femoral cartilage with severe degenerative changes and lateral femoral cartilage that appeared grossly normal (p = 0.443 and 0.622, respectively). Likewise, the levels of expression of VEGF and syndecan-4 mRNA were similar in cultured chondrocytes from medial and lateral femoral cartilage. The levels of expression of VEGF and syndecan-4 mRNAs were significantly and positively correlated in cartilage explant (r = 0.601, p = 0.003) but not in cultured chondrocytes. These results suggest that there is a close relationship between VEGF and syndecan-4 in the cartilage of patients with OA. Further studies are needed to determine the exact pathway by which these two factors interact in the pathogenesis of OA. Cite this article: Bone Joint J 2014;96-B:1319–24.
- Published
- 2014
29. Modified transtibial versus anteromedial portal technique in anatomic single-bundle anterior cruciate ligament reconstruction: comparison of femoral tunnel position and clinical results
- Author
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Yoon-Seok Youm, Seon-Ho Lee, Chang-Hyun Youn, and Sung-Do Cho
- Subjects
Adult ,Male ,medicine.medical_specialty ,Anterior cruciate ligament reconstruction ,medicine.medical_treatment ,Anterior cruciate ligament ,Physical Therapy, Sports Therapy and Rehabilitation ,Achilles Tendon ,Arthroscopy ,Double bundle ,Imaging, Three-Dimensional ,medicine ,Humans ,Orthopedics and Sports Medicine ,Tibia ,Femur ,Prospective Studies ,Femoral tunnel ,medicine.diagnostic_test ,Anterior Cruciate Ligament Reconstruction ,business.industry ,Tibial tunnel ,Surgery ,Patient Outcome Assessment ,medicine.anatomical_structure ,Female ,Tomography ,Nuclear medicine ,business ,Tomography, X-Ray Computed - Abstract
Background: Although several studies have compared a conventional transtibial technique with an anteromedial (AM) portal technique for single-bundle (SB) anterior cruciate ligament (ACL) reconstruction, no study to date has investigated whether the modified transtibial technique results in the femoral tunnel being in a similar anatomic position and produces similar clinical outcomes with those of the AM portal technique. Purpose: To compare the clinical outcomes and femoral tunnel position of SB ACL reconstruction using a modified transtibial technique (creating a femoral tunnel with varus and internal rotation of the tibia as well as modification of the tibial tunnel orientation) with those of SB ACL reconstruction using an AM portal technique. Study Design: Randomized controlled trial; Level of evidence, 1. Methods: A total of 40 patients (40 knees) who underwent arthroscopic SB ACL reconstruction were included in this study. Patients were randomized using a computer-generated sequence into 2 groups: 20 patients by the modified transtibial technique (group 1) and 20 patients by the AM portal technique (group 2). Clinical evaluations included the 2000 International Knee Documentation Committee (IKDC) subjective knee score, Lysholm knee score, Tegner activity scale, Lachman test, pivot-shift test, 2000 IKDC knee examination, and KT-1000 arthrometer measurement. Three-dimensional computed tomography scans were analyzed according to the quadrant method, and the obliquity of the femoral tunnels in the coronal and sagittal planes and the size of the tunnel orifice were measured. Results: All clinical parameters improved significantly after SB ACL reconstruction, with no between-group differences. The mean distance of the femoral tunnel center location from the posterior condylar surface (0.8% difference; P = .167) and from the Blumensaat line (2.1% difference; P = .067) was similar in groups 1 and 2. The mean coronal obliquity of the femoral tunnel was significantly lower in group 1 than in group 2 (42.5° ± 6.1° vs 49.3° ± 7.2°, respectively; P = .001), but the mean sagittal obliquity was similar between the 2 groups (41.9° ± 6.1° vs 43.3° ± 5.4°, respectively; P = .303). The mean area of the tunnel orifice was significantly greater in group 1 than in group 2 (11.6 ± 1.4 × 9.2 ± 1.6 mm vs 10.3 ± 1.1 × 9.1 ± 1.4 mm, respectively; P = .013). Conclusion: The modified transtibial technique for SB ACL reconstruction showed good clinical results and anatomic placement of the femoral tunnel, similar with those of the AM portal technique.
- Published
- 2014
30. Prospective, double-blind, randomized controlled trial of electrophysiologically guided femoral nerve block in total knee arthroplasty
- Author
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Sung Do Cho, Yoon-Seok Youm, and Chang Ho Hwang
- Subjects
electrophysiologic concepts ,medicine.medical_specialty ,Therapeutics and Clinical Risk Management ,medicine.medical_treatment ,Total knee arthroplasty ,knee ,law.invention ,nerve block ,Double blind ,Randomized controlled trial ,Femoral nerve ,law ,medicine ,Pharmacology (medical) ,General Pharmacology, Toxicology and Pharmaceutics ,femoral nerve ,Original Research ,ropivacaine ,Chemical Health and Safety ,Ropivacaine ,business.industry ,General Medicine ,Arthroplasty ,Femoral nerve block ,Surgery ,Nerve block ,arthroplasty ,business ,Safety Research ,medicine.drug - Abstract
Yoon Seok Youm,1 Sung Do Cho,1 Chang Ho Hwang21Department of Orthopedic Surgery, 2Department of Physical Medicine and Rehabilitation, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of KoreaBackground: The purpose of this study was to compare electrophysiologically guided and traditional nerve stimulator analgesia femoral nerve block after total knee arthroplasty.Methods: Patients scheduled for unilateral total knee arthroplasty were randomized to electrophysiologically guided or traditional nerve stimulator analgesia by pre-emptive single injection femoral nerve block with corresponding assistance. We assessed pain scores using a visual analog scale (VAS, 0 = no pain, 100 = the worst pain) and the volumes of morphine consumed at 4, 24, 48, and 72 hours after total knee arthroplasty.Results: Of the 60 patients enrolled, eight withdrew from the study. The remaining 52 patients were randomized to the electrophysiologically guided group (n = 27) or traditional nerve stimulator analgesia (n = 25) group. Four hours after total knee arthroplasty, VAS scores were significantly lower in the electrophysiologically guided group than in the traditional nerve stimulator group at rest (4.8 ± 1.4 versus 5.9 ± 0.8, P < 0.01) and while moving (6.2 ± 1.1 versus 6.9 ± 0.9, P < 0.01). The total volumes of morphine injected at 24, 48, and 72 hours were significantly decreased in the electrophysiologically guided group (P < 0.05 each). Variable × time interaction of VAS was significant in the electrophysiologically guided group (P < 0.05), with each VAS score at 24, 48, and 72 hours being significantly lower than the baseline score (P < 0.05). VAS scores at every time point were significantly lower in the electrophysiologically group guided than in the traditional nerve stimulator group (P < 0.05).Conclusion: Electrophysiologically guided single injection femoral nerve block may provide better postoperative analgesia and a greater reduction in the demand for pain killers than femoral nerve block using traditional nerve stimulator analgesia.Keywords: femoral nerve, nerve block, electrophysiologic concepts, arthroplasty, knee, ropivacaine
- Published
- 2013
31. Morphometric Differences of Distal Femoral Cut Surface between Korean Male and Female in Total Knee Arthroplasty
- Author
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Sung Do Cho, Tae Wook Kang, Seon Ho Lee, Yoon-Seok Youm, and Il Yeong Hwang
- Subjects
030222 orthopedics ,business.industry ,0206 medical engineering ,Total knee arthroplasty ,02 engineering and technology ,Anatomy ,Width ratio ,020601 biomedical engineering ,Resection ,03 medical and health sciences ,0302 clinical medicine ,Medicine ,Implant ,Femoral component ,business - Abstract
®® medical pivot knee (MPK) (403 knees: male 51, female 352) implants were analyzed prospectively. After distal femoral resection, the mediolateral width (ML) was measured at four points (anterior [Ant], distal anterior [DA], distal posterior [DP], and posterior [Post]) and compared with the ML width of the implant respectively. The aspect ratio (AR=ML/anteroposterior width) and width ratio (WR=Ant ML/DP ML) were calculated. Differences in AR, WR, and fitness between male and female were analyzed. Results: The AR of males was larger than that of females for both LPS and MPK; however, no differences in the WR were observed between males and females. The WR in MPK was larger than that in LPS. For both LPS and MPK, females showed greater anatomical fitness than males, and males had relatively greater incidence of undersize than females. For MPK, there were relatively more cases of overhang in Ant and DA cut surface. These results were consistent with the fact that the WR of implant in MPK was larger than that in LPS. Conclusion: Korean males tend to have larger AR and less anatomical fitness of the femoral component than females because of undersize. No difference in WR was observed between Korean males and females. However, the cut surfaces as well as femoral implant of MPK had larger WR than those of LPS. MPK has more overhang on the anterior cut surface than LPS, due to a wider Ant flange (larger WR) of the implant.
- Published
- 2016
32. Relation between mucoid degeneration of the anterior cruciate ligament and posterior tibial slope
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Yoon-Seok Youm, Sung-Do Cho, Ki-Bong Park, and Kwang-Hwan Jung
- Subjects
Adult ,Male ,medicine.medical_specialty ,Knee Joint ,Radiography ,Anterior cruciate ligament ,Group ii ,Mucoid degeneration ,Arthroscopy ,medicine ,Humans ,Orthopedics and Sports Medicine ,Single-Blind Method ,Anterior Cruciate Ligament ,Aged ,medicine.diagnostic_test ,Tibia ,business.industry ,Magnetic resonance imaging ,Gold standard (test) ,Middle Aged ,Arthralgia ,Magnetic Resonance Imaging ,Surgery ,medicine.anatomical_structure ,Case-Control Studies ,Female ,business ,Body mass index - Abstract
The purpose was to analyze the association between posterior tibial slope (PTS) and mucoid degeneration of the anterior cruciate ligament (ACL).From October 1999 to May 2010, 84 arthroscopies were performed in 82 patients (18 men and 64 women) with mucoid degeneration of the ACL. The mean patient age was 53 years (range, 25 to 75 years). In addition to this patient group (group I), the study included a control group without mucoid degeneration of the ACL that was randomly matched for age, sex, body mass index, left or right side, and associated lesions (group II). For each group, the diagnosis was made by use of magnetic resonance imaging and arthroscopy, and a plain lateral radiograph was used to measure the PTS.The mean PTS was 13.5° ± 2.6° (range, 8.2° to 19.5°) in group I and 9.4° ± 2.5° (range, 4.8° to 15.5°) in group II. The mean PTS in group I was significantly greater than that in group II (P.001). For group I, the mean PTS of the involved knee was significantly greater than that of the uninvolved contralateral knee (P = .044). There were no differences according to age, sex, left or right side, body weight, and body mass index (P.05).Mucoid degeneration of the ACL was found to be associated with an increased PTS. The patients with mucoid degeneration of the ACL had a greater mean PTS than matched control patients (13.5° v. 9.4°, P.001).Level III, diagnostic study of nonconsecutive patients without consistently applied gold standard.
- Published
- 2010
33. Three- to six-year follow-up results after high-flexion total knee arthroplasty: can we allow passive deep knee bending?
- Author
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Yoon-Seok Youm, Sung-Do Cho, and Ki-Bong Park
- Subjects
musculoskeletal diseases ,Joint Instability ,Male ,medicine.medical_specialty ,Time Factors ,Knee Joint ,medicine.medical_treatment ,Total knee arthroplasty ,Osteoarthritis ,Cohort Studies ,Weight-Bearing ,Medicine ,Humans ,Orthopedics and Sports Medicine ,Range of Motion, Articular ,Arthroplasty, Replacement, Knee ,Exercise ,Physical Examination ,Aged ,Pain Measurement ,Retrospective Studies ,Postoperative Care ,business.industry ,Kneeling ,Recovery of Function ,Middle Aged ,Osteoarthritis, Knee ,musculoskeletal system ,medicine.disease ,Arthroplasty ,Surgery ,Treatment Outcome ,High flexion ,Patient Satisfaction ,Radiological weapon ,Orthopedic surgery ,Female ,business ,Range of motion ,Knee Prosthesis ,Tomography, X-Ray Computed ,human activities ,Follow-Up Studies - Abstract
We evaluated 3- to 6-year clinical and radiological follow-up results after NexGen® LPS-flex total knee arthroplasty (TKA).A retrospective evaluation was undertaken of 218 knees in 166 patients (22 males, 144 females) who were followed up for more than 3 years after TKA. Evaluations included preoperative and postoperative range of motion (ROM) measurement, Knee Society (KS) Score, tibiofemoral angle and assessment of postoperative complications.TKA resulted in a significant ROM increase from a mean flexion contracture of 9° (range 0°-20°) and further flexion of 117° (range 80°-155°) to a mean flexion contracture of 2° (range 0°-10°) and a further flexion of 131° (range 95°-155°). KS knee and function scores significantly improved from 52 and 38 before surgery to 87 and 82 after surgery, respectively. The tibiofemoral angle significantly improved from varus 5.7° to valgus 5.4°. Progressive radiolucent lines around the femoral component on radiographs were observed in 30 knees (13.8%, 27 patients), and more of those knees, could squat than non-radiolucent knees (76.7 vs. 20.2%; P0.05). Seven knees (3.2%, 6 patients) were revised at a mean 49 months after the index operation.While NexGen® LPS-flex TKA satisfactorily improved ROM, it was associated with a relatively high incidence of early loosening of the femoral components. This might be associated with passive-maximal flexion activity, such as squatting or kneeling. The clinical relevance of this study is that squatting or kneeling, common activity in Asian, may not be allowed after NexGen® LPS-flex TKA.
- Published
- 2009
34. The effect of patellar thickness changes on patellar tilt in total knee arthroplasty
- Author
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Yoon-Seok Youm, Jae-Ho Woo, Byung Kwan Kim, and Woo-Shin Cho
- Subjects
musculoskeletal diseases ,medicine.medical_specialty ,Radiography ,Total knee arthroplasty ,medicine ,Humans ,Orthopedics and Sports Medicine ,Arthroplasty, Replacement, Knee ,Aged ,Aged, 80 and over ,business.industry ,Patellar tilt ,Patella ,Middle Aged ,musculoskeletal system ,Surgery ,Biomechanical Phenomena ,Osteotomy ,Tilt (optics) ,Orthopedic surgery ,Female ,sense organs ,Nuclear medicine ,business ,Knee Prosthesis ,human activities - Abstract
We hypothesized that changes in patellar thickness following patellar resurfacing affect patellar tilt in total knee arthroplasty (TKA) patients. The study enrolled 272 TKAs and categorized them into four groups according to change in patellar thickness: (A) thinner by 1 mm or more, (B) equal or thinner by less than 1 mm, (C) thicker by 1 mm or less, and (D) thicker by more than 1 mm. Patellar tilt angle was measured postoperatively using Merchant radiography. There were no significant differences in postoperative patellar tilt among groups A, B, and C (n.s). However, the postoperative patellar tilting angle of group D was significantly higher than that of all other groups (P0.05). Postoperative patellar tilt increased when the postoperative patella was1 mm thicker than the preoperative patella.
- Published
- 2009
35. Migration of polyethylene fixation screw after total knee arthroplasty
- Author
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Woo-Shin Cho and Yoon-Seok Youm
- Subjects
musculoskeletal diseases ,Male ,medicine.medical_specialty ,Bone Screws ,Total knee arthroplasty ,Biocompatible Materials ,Total knee ,Fixation (surgical) ,chemistry.chemical_compound ,Foreign-Body Migration ,Medicine ,Outpatient clinic ,Humans ,Orthopedics and Sports Medicine ,Femoral component ,Arthroplasty, Replacement, Knee ,Aged ,business.industry ,Posterior stabilized ,Polyethylene ,Middle Aged ,musculoskeletal system ,Surgery ,Prosthesis Failure ,chemistry ,Locking mechanism ,Female ,business ,human activities - Abstract
Duracon (Howmedica, Rutherford, NJ) posterior stabilized total knee system has a snap fit locking mechanism of a tibial polyethylene, including an additional locking screw for further fixation of polyethylene. We report 13 cases of locking screw migration from tibial component after Duracon posterior stabilized primary total knee arthroplasty. Among 13 knees, screw migration in 10 asymptomatic cases was incidentally detected during regular follow-up, and they were just observed in the outpatient clinic. Only 3 knees had moderate pain, swelling, and instability, and revision was done on 2 of 3 knees.
- Published
- 2008
36. Classification of postaxial polydactyly of the foot
- Author
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Ho Seong Lee, Jun O. Yoon, Jin Sam Kim, Yoon-Seok Youm, and Soo Sung Park
- Subjects
Postaxial polydactyly ,Adult ,Male ,Adolescent ,Foot Deformities, Congenital ,Radiography ,03 medical and health sciences ,0302 clinical medicine ,Accessory digit ,medicine ,Humans ,Orthopedics and Sports Medicine ,Child ,030222 orthopedics ,Polydactyly ,business.industry ,Treatment options ,Infant ,030229 sport sciences ,Anatomy ,medicine.disease ,Child, Preschool ,Classification methods ,Surgery ,Female ,business ,Foot (unit) - Abstract
Background: The origins and shapes of accessory digits in postaxial polydactyly of the foot were analyzed morphologically and radiographically, and their characteristics were determined. A simple classification method was then devised to assist in determining the most appropriate treatment options. Methods: We evaluated 113 feet of 95 patients who had surgery for the treatment of postaxial polydactyly between 1998 and 2002. Based on the morphologic, radiographic, and operative findings, the cases were classified according to the origin of the accessory digit: middle phalangeal, proximal phalangeal, floating, fifth metatarsal, or fourth metatarsal. The proximal phalangeal type was further divided into three subtypes: proximal phalangeal lateral type, proximal phalangeal medial, and proximal phalangeal head. Results: Of the 113 feet, 36 were middle phalangeal type, 45 were proximal phalangeal type, 5 were floating type, 15 were fifth metatarsal type, and 12 were fourth metatarsal type. Of the proximal phalangeal types, 15 were laterally duplicated supernumerary sixth digits, and 17 were medially duplicated supernumerary fifth digits. The duplicated digits of the remaining 13 originated at the distal portion of the proximal phalanx. In the middle phalangeal, proximal phalangeal head, proximal phalangeal medial, and fourth metatarsal types, the medial accessory fifth digit was an abnormally duplicated digit, which was excised. In the proximal phalangeal lateral, floating, and fifth metatarsal types, the lat eral accessory sixth digit was excised. For the children in this study, we did not perform reconstruction of the deep transverse metatarsal ligament or collateral ligament. Also, we did not use longitudinal pin fixation. Skin necrosis occurred in 10 feet that resolved, and in five of the 15 feet of the 5thmetatarsal medial deviation occurred. Conclusions: Based on the morphologic, radiographic, and operative findings, we suggest a classification method of postaxial polydactyly of the foot. We believe this is a straightforward and useful method for the treatment of postaxial polydactyly.
- Published
- 2006
37. Patterns and Influencing Factors of Medial Meniscus Tears in Varus Knee Osteoarthritis.
- Author
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Sung-Do Cho, Yoon-Seok Youm, Jong-Hyun Kim, Hye-Yong Cho, and Kwang-Ho Kim
- Subjects
- *
MENISCUS (Anatomy) , *OSTEOARTHRITIS , *KNEE abnormalities , *TOTAL knee replacement , *BODY mass index , *ANTERIOR cruciate ligament - Abstract
Purpose: To investigate the patterns of medial meniscus (MM) tears in patients with varus knee osteoarthritis who underwent total knee arthroplasty and analyze the factors that could affect MM tears. Materials and Methods: The patients (365 knees, 268 patients) were classified into three groups; group I with MM posterior horn (PH) tear only; group II with MM root tear only; and group III with MMPH plus root tear. The following factors were evaluated: age, gender, body mass index, varus deviation of the mechanical axis, medial proximal tibial angle, posterior tibial slope (PTS), and anterior cruciate ligament (ACL) integrity (normal, degeneration, and tear or absence). Results: MM tears were identified in all knees. The patterns of the combined MMPH tears in group III were less complex than those in group I. Varus deviation and PTS were significantly greater in group III than groups I and II. In group III, there were significantly more cases of ACL tear or absence than groups I and II. The others showed no differences among three groups. Conclusions: Severe varus knee osteoarthritis was always accompanied by MM tears. Risk factors for MMPH plus root tears were severe varus deformity, great PTS, and ACL tear or absence. [ABSTRACT FROM AUTHOR]
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- 2016
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38. Relationship between Mucoid Degeneration of the Anterior Cruciate Ligament and Posterior Tibial Slope in Patients with Total Knee Arthroplasty.
- Author
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Yoon-Seok Youm, Sung-Do Cho, Hye-Yong Cho, and Seung-Hyun Jung
- Subjects
- *
MUCOIDS , *ANTERIOR cruciate ligament , *TOTAL knee replacement , *OSTEOARTHRITIS , *ARTHROPLASTY , *PATIENTS - Abstract
Purpose: The purpose was to analyze the relationship between posterior tibial slope (PTS) and mucoid degeneration of the anterior cruciate ligament (ACL) in patients with total knee arthroplasty. Materials and Methods: Four hundred and twenty-four patients (24 males and 400 females; 636 knees) who received total knee arthroplasty for osteoarthritis were included. Their mean age was 68.9 years (range, 48 to 88 years). The patients were classified into three groups according to the status of ACL; normal ACL group (group I), mucoid degeneration of ACL group (group II) and ruptured or absent ACL group (group III). Plain lateral radiographs were used to measure the PTS and the values were compared among groups. Results: There were no significant differences with regard to gender, age and left-to-right side ratio among groups (p>0.05). The mean PTS was 9.9° (range, 0.6° to 20.1°) in group I (161 knees), 10.8° (range, 0.2° to 21.8°) in group II (342 knees) and 12.3° (range, 2° to 22.2°) in group III (133 knees), which showed significant differences (p<0.001). Conclusions: The patients with mucoid degeneration of the ACL and those with ruptured or absent ACL had greater PTS than those with normal ACL. These findings suggest that an increased PTS may be one of the causative factors for mucoid degeneration of the ACL. [ABSTRACT FROM AUTHOR]
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- 2016
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39. Relationship between the Synovialization and the Clinical Results after Anterior Cruciate Ligament Reconstruction Using Tibialis Tendon Allograft
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Yoon-Seok Youm, Jin Eo, Sung Do Cho, Ki Jae Lee, and Young Jin Choi
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medicine.medical_specialty ,medicine.diagnostic_test ,Anterior cruciate ligament reconstruction ,business.industry ,Anterior cruciate ligament ,medicine.medical_treatment ,Arthroscopy ,Pivot-shift test ,Lachman test ,Group A ,Group B ,Tendon ,Surgery ,medicine.anatomical_structure ,medicine ,business - Abstract
The purpose of this study was to evaluate the relationship between the second-look arthroscopic findings of synovialization and the clinical results after the arthroscopic anterior cruciate ligament (ACL) reconstruction with the fresh-frozen tibialis tendon allograft. Fifty-seven patients could be examined with the second-look arthroscopy after the ACL reconstruction with tibialis tendon allograft. The average duration from reconstruction to second-look arthroscopy was 18.4 months (range, 4 –48 months). The patients were classified, according to the extent of synovialization, into 3 groups; 37 cases (64.9%) in group A (good), 15 cases (26.3%) in group B (partial), and 5 cases (8.8%) in group C (poor). The clinical results were compared in each group. The 2000 International Knee Documentation Committee (IKDC) subjective knee score was 80 or more in 31 cases (83.8%) in group A, 9 (60%) in group B, and 1 (20%) in group C respectively. All thirty seven cases (100%) in group A had negative or 1+firm end-point Lachman test and negative pivot shift test, however, only 2 cases (40%) in group C. KT-1000 arthrometer measurement was less than 5 mm in 37 (100%) in group A, 14 (93.3%) in group B, and 2 (40%) in group C. According to the 2000 IKDC knee examination form, 37 (100%) in group A, 14 (93.3%) in group B, and 2 (40%) in group C respectively were normal or nearly normal. The synovialization of the graft had positive correlation with the clinical results after the ACL reconstruction with fresh-frozen allograft.
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- 2012
40. Mucoid Degeneration of Both ACL and PCL
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Yoon-Seok Youm, Chae-Chil Lee, Dong-Kyo Seo, Sung-Do Cho, and Tae Won Kim
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Male ,medicine.medical_specialty ,Knee Joint ,Anterior cruciate ligament ,Case Report ,Mucoid degeneration ,medicine ,Humans ,Posterior cruciate ligament ,Knee ,Orthopedics and Sports Medicine ,Anterior Cruciate Ligament ,Partial excision ,medicine.diagnostic_test ,business.industry ,Magnetic resonance imaging ,Middle Aged ,equipment and supplies ,musculoskeletal system ,Arthralgia ,Surgery ,Radiography ,surgical procedures, operative ,medicine.anatomical_structure ,Knee pain ,Clinical diagnosis ,Orthopedic surgery ,Joint Diseases ,medicine.symptom ,business ,human activities - Abstract
Unlike meniscal tears and chondral defects, the mucoid degeneration of the anterior cruciate ligament (ACL) is a rare cause of knee pain and there have been no case reports of mucoid degeneration of both the ACL and the posterior cruciate ligament (PCL). A 48-year-old-male patient presented with knee pain and limitation of motion. The patient's magnetic resonance imaging, arthroscopic findings, and pathologic diagnosis confirmed a clinical diagnosis of mucoid degeneration of both the ACL and the PCL. The symptoms disappeared after arthroscopic partial excision of the ACL and PCL.
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- 2012
41. Apoptosis in the Osteonecrosis of the Femoral Head
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Soo-Youn Lee, Yoon-Seok Youm, and Soo Ho Lee
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Adult ,Male ,Pathology ,medicine.medical_specialty ,Programmed cell death ,medicine.medical_treatment ,Apoptosis ,Pathogenesis ,Femoral head ,Femur Head Necrosis ,In Situ Nick-End Labeling ,medicine ,Humans ,Orthopedics and Sports Medicine ,Aged ,Aged, 80 and over ,TUNEL assay ,business.industry ,Femur Head ,Middle Aged ,Arthroplasty ,medicine.anatomical_structure ,Osteonecrosis of the femoral head ,Orthopedic surgery ,Etiology ,Female ,Original Article ,Surgery ,business - Abstract
†Background: Osteonecrosis of the femoral head is classified into idiopathic and secondary forms. A number of etiological factors in the development of osteonecrosis have been suggested but the biological mechanisms are still unclear. Recently, some reports suggested that the apoptosis is closely related to osteonecrosis of the femoral head. Therefore, this study examined the expression of apoptosis in osteonecrosis of the femoral head. Methods: Of the patients diagnosed preoperatively with osteonecrosis and underwent total hip replacement arthroplasty between August 2004 and July 2005, 58 patients (58 hips) were available for this study. Their diagnoses were confirmed by the postoperative pathology findings. Tissue samples of the femoral head sections were terminal deoxynucleotydyl transferase mediated dUTP nick-end labeling (TUNEL) stained using an in situ cell death detection POD kit. The number of total and TUNELpositive osteocytes, and the average ratio of TUNEL-positive cells were calculated and analyzed according to the cause. Results: Osteonecrosis was steroid-induced in 8 cases (13.8%), alcohol-induced in 29 cases (50%), post-traumatic in 6 cases (10.3%) and idiopathic in 15 cases (25.9%). The percentage of TUNEL-positive osteocytes was high in patients with steroid- and alcohol-induced osteonecrosis of the femoral head but low in patients with post-traumatic and idiopathic osteonecrosis. The difference in the percentage of TUNEL-positive osteocytes between these groups was significant ( p < 0.05). Conclusions: Apoptosis might play an important role in the pathogenesis of osteonecrosis of the femoral head induced by steroid and alcohol. These findings highlight a need for further research into the role of apoptosis in the development of osteonecrosis of the femoral head.
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- 2010
42. Clinical Value of 'The Single Stitch Method' in Intraoperative Assessment of Patellar Tracking in Total Knee Arthroplasty
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Yoon-Seok Youm, Sung-Do Cho, Chang-Yoon Jung, and Han-Chang Park
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medicine.medical_specialty ,business.industry ,Clinical value ,Total knee arthroplasty ,Medicine ,General Medicine ,business ,Tracking (particle physics) ,Surgery - Published
- 2010
43. Discal Cyst of Lumbar Spine - A Case Report
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Jae-Ryong Cha, Sang Woo Kim, Chae Chil Lee, Kwang Hwan Jung, Ki Bong Park, Yoon-Seok Youm, Sung Do Cho, and Sang Hoon Ko
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business.industry ,Medicine ,Lumbar spine ,Anatomy ,business ,Discal cyst - Published
- 2010
44. The Crowned Dens Syndrome - A Case Report
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Sung-Do Cho, Sang-Hun Ko, Yoon-Seok Youm, Jee-Young Jung, Ki-Bong Park, Kwang-Hwan Jung, Chae-Chil Lee, and Jae-Ryong Cha
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Odontoid process ,business.industry ,medicine ,Anatomy ,medicine.disease ,business ,Calcification - Published
- 2008
45. All Arthroscopic Repairs with Massive Cuff Stitch in Medium-sized Full Thickness Rotator Cuff Tears
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Jae-Ryong Cha, Hyung-Min Jeon, Kwang-Hwan Jung, Sung-Do Cho, Sang-Hun Ko, Chae-Chil Lee, Chang-Yun Jung, Dong-Kyo Seo, and Yoon-Seok Youm
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Pain score ,medicine.medical_specialty ,business.industry ,Full thickness rotator cuff tear ,General Medicine ,Ucla score ,Surgery ,medicine.anatomical_structure ,Patient age ,Cuff ,Tears ,Medicine ,Full thickness ,Rotator cuff ,business - Abstract
Purpose: We wanted to evaluate the usefulness of arthroscopic repair using the modified Mason-Allen Massive Cuff Stitch for medium sized full thickness rotator cuff tear. We verified the clinical results and evaluated the repair integrity after short term follow up. Materials and Methods: Twenty-three cases of arthroscopically repaired full thickness tear of the rotator cuff of an estimated medium size were evaluated between December 2004 to May 2005. The average patient age was 54 years old (range: 43-69 years old), and the mean follow-up was 14 months (range: 12-17 months). We analyzed the results by paired t-test. The follow up MRIs were checked in 11 cases. Results: The VAS pain score was improved from a preoperative average of 7.0 to a postoperative average of 0.9, the ADL was improved from 11.1 to 26.0 and the UCLA score was improved from 13.6 to 32.5 (all p<0.05). 91.3% showed an excellent or good result at the final follow-up. The satisfied rate was 95.7% (22 cases). There was re-rupture of the repaired rotator cuff in one out of 11 cases (9.1%). Conclusion: Arthroscopic repairs using a modified Mason-Allen Massive Cuff Stitch for full thickness rotator cuff tear of an estimated medium size showed good clinical outcomes.
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- 2008
46. Bonding Strength between Cement and an Implant according to the Cementing Time
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Je Ho Woo, Hwa Kyo Byeon, Byung Kwan Kim, Woo Shin Cho, and Yoon-Seok Youm
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Cement ,business.industry ,Bonding strength ,Ultimate tensile strength ,Medicine ,General Medicine ,Implant ,Composite material ,Bone cement ,business - Abstract
Purpose: The objective of this study was to compare the bonding strength between cement and an implant according to the cementing time. Materials and Methods: The two types of cement used were CMWⓇ 1 and 3 (Depuy Ltd., Blackpool, UK). Plastic molds containing CMWⓇ 1 were pressed onto metal blocks at 2, 4, 5 or 6 minutes after mixing the cement, while molds containing CMWⓇ 3 were pressed onto blocks at 3, 5, 6 or 7 minutes after mixing the cement. Tensile strength was tested with using an Instron Model 8874 (Instron Corp., Canton, MA, USA). Tensile strengths were compared using the Kruskal-Wallis test and the Mann-Whitney U test. Results: The strongest bonding strengths for the tensile load were at 2 minutes post-mixing for CMWⓇ 1, and at 3 minutes post-mixing for CMWⓇ 3. The strength rapidly decreased after 5 minutes for CMWⓇ 1 and after 6 minutes for CMWⓇ 3. Conclusion: This study suggests that the risk of loosening between cement and an implant is likely to be minimized by the surgical technique that considers the bonding strength according to time.
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- 2008
47. Ultrasonographic Findings of Aspergillus Bursitis in a Patient with a Renal Transplantation: A Case Report
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Myeon Jun Yang, Byeong Seong Kang, Seong Hoon Choi, Sung Bin Park, Young Min Kim, Yoon-Seok Youm, and Ae Kyung Jeong
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medicine.medical_specialty ,Aspergillus ,Bursitis ,biology ,business.industry ,medicine.disease ,biology.organism_classification ,Aspergillosis ,Surgery ,Transplantation ,Renal transplant ,Medicine ,Soft tissue mass ,Radiology ,Ultrasonography ,skin and connective tissue diseases ,business - Abstract
Aspergillus bursitis is an uncommon condition demonstrated as a nonspecific soft tissue mass. To our knowledge, the ultrasonographic findings of aspergillus bursitis in immunocompromised patients have not been previously reported. Here, we report a case of aspergillus bursitis in a renal transplant recipient, accompanied by the associated ultrasonographic findings.
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- 2008
48. The Methods and Results of Revision Total Knee Arthroplasty
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Jihyo Hwang, Yoon-Seok Youm, Woo-Shin Cho, Sung-Chan Ahn, Soo-Heon Hong, and Ji Hoon Suh
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medicine.medical_specialty ,Scoring system ,business.industry ,Radiography ,medicine.medical_treatment ,General Medicine ,Bone defect ,Prosthesis ,Total knee ,Surgery ,medicine ,business ,Range of motion ,Revision total knee arthroplasty ,Fixation (histology) - Abstract
Purpose: To suggest operative methods for revision total knee arthroplasty (TKA) according to the causes of revision surgery. Materials and Methods: The operative methods of 70 revision total knee arthroplasties in 64 patients between December 1996 and December 2004 were analyzed according to the causes. The mean follow-up period was 65 months (25-120 months). The range of motion and Hospital for Special Surgery (HSS) score were used for the clinical evaluation and the scoring system of American Knee Society was used for the radiographic evaluation. Results: The mean periods of revision surgery from the initial operation was 59 months (1 month-20 years). Posterior cruciate retaining prosthesis was used in 8 cases, posterior cruciate substituting prosthesis in 14 cases, and constrained type prosthesis in 48 cases. The extension stem was required in 51 cases, metal augmentation in 34 cases, and structural allograft in 15 cases for bone defect treatment and firm fixation. The average range of motion improved from 88.8 o preoperatively to 105.8 o at the final follow-up. HSS score also improved from 60.5 to 87.6 points. The complications after revision TKA were 3 infections (4.3%), 1 patellar dislocation (1.4%), and 1 polyethylene dislo- cation (1.4%). Conclusion: Constrained type prostheses were needed in many cases of revision TKA. Satis- factory results were obtained using an additional structural allograft, metal augmentation, and ex- tension stem for bone defect treatment and firm fixation.
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- 2007
49. Total Knee Arthroplasty with NexGen® System - 3-8 Year Follow-up Results
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Sung-Do Cho, Ki-Bong Park, Yoon-Seok Youm, Kwang-Hwan Jung, Jae-Ryong Cha, Sang-Hun Go, and Chae-Chil Lee
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musculoskeletal diseases ,Knee function ,Flexion contracture ,medicine.medical_specialty ,biology ,business.industry ,Total knee arthroplasty ,Follow up results ,musculoskeletal system ,Cruciate retaining ,biology.organism_classification ,Surgery ,Valgus ,medicine ,Range of motion ,business - Abstract
Ⓡ total Ⓡ TKA (cruciate retaining (CR) type:34, posterior cruciate substituting (PS) type:62) from March 1997 to May 2002, were evaluated retrospectively. The evaluations included the preoperative and postoperative range of motion (ROM), Knee Society Score (KSS), knee functional score, tibiofemoral angle and postoperative complications. Results: The ROM increased from preoperative mean flexion contracture of 9.3° and further flexion of 116.4° to a postoperative mean flexion contracture of 2.1° and further flexion of 126.3° (ROM: 124.2°). The ROM of CR type improved from 112.7° to 123.1°, and the PS type improved from 105.3° to 124.9° (p>0.05). The KSS and knee function score improved from 54 and 41 before surgery to 94 and 87 after surgery, respectively (p>0.05). The tibiofemoral angle changed from preoperative varus 5.7° to postoperative valgus 5.2°. The complications were two cases of infection and two cases of early loosening. Conclusion: The 3 to 8 year follow-up results after NexGen Ⓡ TKA were satisfactory in both the
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- 2007
50. The Causes of Revision Total Knee Arthroplasty
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Woo-Shin Cho, Byung-Se Yang, and Yoon-Seok Youm
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musculoskeletal diseases ,Stiff knee ,medicine.medical_specialty ,Revision arthroplasty ,business.industry ,Patellar Dislocations ,Medicine ,musculoskeletal system ,business ,Revision total knee arthroplasty ,Total knee ,Surgery - Abstract
Purpose : To assess the causes of revision total knee arthroplasty (TKA). Materials and Methods : The causes of 90 revision total knee arthroplasties were analyzed in 84 patients between December 1996 and June 2006. The patients’ history, medical records and radiographs were reviewed in order to detect the main cause of failure of the primary TKA. Results : The causes of revision TKA are as follows: 34 infections (37.8%), 26 loosenings (28.9%), 17 polyethylene wears or breakages (18.9%), 5 stiffness (5.6%), 4 polyethylene dislocations (4.4%), 2 patellar dislocations (2.2%), 1 patellar component failure and 1 instability (1.1%). The mean interval from the index operation to the revision surgery was 59 months (1 month-20 years). Conclusion : Infection was the most common causes of revision TKA followed by loosening, wear or breakage of the polyethylene, stiff knee, and dislocation of the polyethylene.
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- 2007
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