244 results on '"Ki-Chul Park"'
Search Results
2. A multicenter study of factors affecting nonunion by radiographic analysis after intramedullary nailing in segmental femoral shaft fractures
- Author
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Incheol Kook, Ki-Chul Park, Dong-Hong Kim, Oog-Jin Sohn, and Kyu Tae Hwang
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Medicine ,Science - Abstract
Abstract The factors affecting the outcomes of segmental femoral shaft fractures are currently unknown. We evaluated the outcomes of intramedullary (IM) nail fixation and investigated factors affecting nonunion of femoral shaft segmental fractures. A total of 38 patients who underwent IM nail fixation for femoral shaft segmental fractures (AO/OTA 32C2) at three university hospitals with a minimum 1-year follow-up period were retrospectively reviewed. The patients were divided into union (n = 32) and nonunion (n = 6) groups. We analyzed smoking status, diabetes mellitus, location of the segmental fragment, segment comminution, filling of the IM nail in the medullary canal, residual gap at the fracture site, use of a cerclage wire or blocking screws as factors that may affect the surgical outcome. In the union group, the average union time was 5.4 months (4–9 months). In the nonunion group, five patients required additional surgery within an average of 7.2 months (5–10 months) postoperatively, whereas one patient remained asymptomatic and did not require further intervention. On comparing the two groups, insufficient canal filling of the IM nail (union, 25.0%; nonunion, 83.3%; p = 0.012) and the presence of a residual gap at the fracture site after reduction (union, 31.3%; nonunion, 83.3%; p = 0.027) were significantly different. In the multivariate analysis, only insufficient canal filling of the IM nail was found to be a factor affecting nonunion, with an odds ratio of 13.3 (p = 0.036). In this study, a relatively high nonunion rate (15.8%) was observed after IM nail fixation. Insufficient IM nail canal filling and a residual gap at the fracture site post reduction were factors affecting segmental femoral shaft fracture nonunion after IM nail fixation.
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- 2023
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3. Usefulness of a drill stopper to prevent iatrogenic soft tissue injury in orthopedic surgery
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Jung Hwan Choi, Young Seok Lee, Kyu-Tae Hwang, Young-Hoon Jo, Hyun Sik Shin, Jihwan Kim, and Ki-Chul Park
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Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Objective: This study introduces a novel technique utilizing a drill stopper to limit drill penetration depth and to prevent iatrogenic injuries, specifically neurovascular damage, in orthopedic surgeries. Orthopedic surgeries frequently involve the use of drills, which are essential tools for various procedures. However, improper handling of drills can lead to iatrogenic soft tissue injuries, causing severe consequences such as permanent disability or life-threatening complications. To address this issue, we propose the use of a drill stopper as a safeguard to prevent excessive drill penetration and reduce the risk of soft tissue damage during surgery. Materials and Methods: The study involved 32 orthopedic surgeons, half of whom were experienced and the other half inexperienced. Synthetic femur bone models (Synbone) were used for drilling exercises, employing four configurations: a sharp drill bit without a stopper (SF, Sharp Free), a sharp drill bit with a stopper (SS, Sharp Stopper), a blunt drill bit without a stopper (BF, Blunt Free), and a blunt drill bit with a stopper (BS, Blunt Stopper). Each participant conducted three trials for each configuration, and the penetration depth was measured after each trial. Results: For experienced surgeons, the average penetration depths were 3.83 (±1.826)mm for SF, 11.02 (±3.461)mm for BF, 2.88 (±0.334)mm for SS, and 2.75 (±0.601)mm for BS. In contrast, inexperienced surgeons had average depths of 8.52 (±4.608)mm for SF, 18.75 (±4.305)mm for BF, 2.96 (±0.683)mm for SS, and 2.83 (±0.724)mm for BS. Conclusion: The use of a drill stopper was highly effective in controlling drill penetration depth and preventing iatrogenic injuries during orthopedic surgeries. We recommend its incorporation, particularly when using a blunt drill bit or when an inexperienced surgeon operates in an anatomically unfamiliar area. Using the drill stopper, the risk of severe injuries from excessive drill penetration can be minimized, leading to improved patient safety and better surgical outcomes.
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- 2023
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4. Biomechanical comparison of the femoral neck system and the dynamic hip screw in basicervical femoral neck fractures
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Jun-Ki Moon, Jung Il Lee, Kyu-Tae Hwang, Jae-Hyuk Yang, Ye-Soo Park, and Ki-Chul Park
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Medicine ,Science - Abstract
Abstract The purpose of this study was to compare the fixation stability of proximal fragments and the mechanical characteristics in proximal femur models of basicervical femoral neck fracture fixed by the femoral neck system (FNS) versus the dynamic hip screw. The mean axial stiffness was 234 ± 35 N/mm in the FNS group and 253 ± 42 N/mm in the DHS group, showing no significant difference (p = 0.654). Mean values for x-axis rotation, y-axis rotation, and z-axis rotation after cycle load were 2.2 ± 0.5°, 6.5 ± 1.5°, and 2.5 ± 0.6°, respectively, in the FNS group and 2.5 ± 0.7°, 5.8 ± 2.1°, and 2.2 ± 0.9°, respectively, in the DHS group, showing no significant differences (p = 0.324, p = 0.245, and p = 0.312, respectively). The mean values of cranial and axial migration of screws within the femoral head were 1.5 ± 0.3 and 2.1 ± 0.2 mm, respectively, in the FNS group and 1.2 ± 0.3 and 2.4 ± 0.3 mm, respectively, in the DHS group, showing no significant differences (p = 0.425 and p = 0.625, respectively). The average failure load at vertical load was 1342 ± 201 N in the FNS group and 1450 ± 196 N in the DHS group, showing no significant difference (p = 0.452). FNS fixation might provide biomechanical stability comparable to that of DHS for treating displaced basicervical femoral neck fractures in young adults.
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- 2022
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5. Clinical outcomes after mini-hook plate fixation for small avulsion fractures around the interphalangeal or metacarpophalangeal joints of the hand
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Jung Il Lee, Ki-Chul Park, Hyun Soo So, and Duk Hee Lee
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Hook plate ,Mini-hook plate ,Mallet finger ,Mallet fracture ,Avulsion fracture ,Phalangeal avulsion ,Orthopedic surgery ,RD701-811 ,Diseases of the musculoskeletal system ,RC925-935 - Abstract
Abstract Background Mini-hook plate has been described for the treatment of various small avulsion fragments in the hand. This retrospective study aimed to evaluate clinical outcomes after mini-hook plate fixation in patients with an avulsion fracture around the interphalangeal or metacarpophalangeal joints of the hand. Methods Nineteen patients with avulsion fractures around the interphalangeal or metacarpophalangeal joints of the hand were included in this study. Seven patients had a mallet fracture, and 12 patients had other phalangeal avulsion fractures including central slip, collateral ligament, volar plate, and flexor avulsion fractures. The osseous union and functional outcomes, including finger joint motion, joint stability, pinching strength, and the disabilities of the arm, shoulder, and hand score, were evaluated. Results The mean duration of follow-up was 33.8 months. All patients in mallet and other phalangeal avulsion fractures achieved osseous union between the avulsion fragment and phalangeal bone, and there was no joint subluxation. There were no significant differences in the disabilities of the arm, shoulder, and hand scores. However, the patients with mallet fracture have lower mean percentage values of the total active range of motion and pinching strength than other phalangeal avulsion fractures. We abandoned this procedure in mallet fractures because the early results after mini-hook plate fixation in mallet fractures appeared unfavorable. Conclusion These results suggest that the mini-hook plate fixation can provide sufficient stability and good clinical outcomes in those with phalangeal avulsion fractures. However, the outcomes for mallet fractures were not as good as those for other phalangeal avulsion fractures.
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- 2021
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6. Extraskeletal osteosarcoma misdiagnosed as heterotopic ossification after periprosthetic femoral fracture: A case report
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Il-Hoon Sung, Hee-Jung Son, Jin-Sung Park, Young-Sik Song, and Ki-Chul Park
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Orthopedic surgery ,RD701-811 - Published
- 2020
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7. Experimental Study on Hydraulic Performance of Perforated Caisson Breakwater with Turning Wave Blocks
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In-Chul Kim and Ki-Chul Park
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Non-porous caisson ,Turning wave blocks caisson ,Reflection coefficients ,Wave overtopping rates ,Wave forces ,Ocean engineering ,TC1501-1800 - Abstract
Recently, a perforated caisson breakwater with turning wave blocks was developed to improve the water affinity and public safety of a rubble mound armored by TTP. In this study, hydraulic model tests were performed to examine the hydraulic performance of a non-porous caisson and new caisson breakwater with perforated blocks for attacking waves in a small fishery harbor near Busan. The model test results showed that the new caisson was more effective in dissipating the wave energy under normal wave conditions and in reducing the wave overtopping rates under design wave conditions than the non-porous caisson. It was found that the horizontal wave forces acting on the perforated caisson were slightly larger than those on the non-porous caisson because of the impulsive forces on the caisson with the turning wave blocks.
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- 2019
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8. Comparison of outcomes according to fixation technique following the modified Ludloff osteotomy for hallux valgus in patients with rheumatoid arthritis
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Young-Hoon Jo, Ki-Chul Park, Young-Sik Song, and Il-Hoon Sung
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Rheumatoid arthritis ,Hallux valgus ,Metatarsal osteotomy ,Fixation stability ,Diseases of the musculoskeletal system ,RC925-935 - Abstract
Abstract Background Clinical and radiological outcomes including fixation stability of osteotomy site were compared in rheumatoid arthritis (RA) patients who underwent modified Ludloff osteotomy to correct hallux valgus with osteotomy site fixation using two screws versus those who underwent additional fixation using a plate. Methods The fixation technique performed with two screws was used to fix the osteotomy sites following modified Ludloff osteotomy in 15 patients (15 feet, Group S), while the augmented plate fixation technique was used in 14 patients (16 feet, Group P). Surgical outcomes were analysed using the American Orthopedic Foot and Ankle Society (AOFAS) scores, and radiologic parameters measured before surgery and during follow-up examinations. To evaluate the stability of each osteotomy site fixation technique, the 1–2 inter-metatarsal angle (IMA) and angle of the altered margin of the lateral cortex (AMLC) were measured immediately and 6 weeks after surgery, and variations in the angles were compared. In addition, bone mineral density (BMD) values were compared between patients with correction loss at the osteotomy site and those with no loss of correction. Results No significant differences between groups were found for total AOFAS scores before surgery and at the final follow-up. However, significant differences were observed in the 1–2 IMA, beginning at 6 weeks postoperatively and continuing through the final follow-up. The 1–2 IMA and angle of AMLC measured immediately after and 6 weeks after surgery showed significantly greater variation in Group S than in Group P. In Group S, patients with correction loss (5 feet) at osteotomy site showed significantly lower BMD values than those with no loss of correction (10 feet). Despite the lower BMD values of patients in Group P than in Group S, a loss of correction did not occur in these patients. Conclusions Correction loss occurred at the osteotomy site within 6 weeks postoperatively in patients who underwent fixation using only the two-screw fixation technique following modified Ludloff osteotomy; such loss could be reduced using the augmented plate fixation technique even in patients with osteoporosis.
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- 2017
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9. Corrigendum to: Experimental Study on Hydraulic Performance of Perforated Caisson Breakwater with Turning Wave Blocks
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In-Chul Kim and Ki-Chul Park
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Ocean engineering ,TC1501-1800 - Published
- 2019
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10. Prophylactic Nailing of Incomplete Atypical Femoral Fractures
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Chang-Wug Oh, Jong-Keon Oh, Ki-Chul Park, Joon-Woo Kim, and Yong-Cheol Yoon
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Technology ,Medicine ,Science - Abstract
Introduction. Recent reports have described the occurrence of low-energy subtrochanteric and femoral shaft fractures associated with long-term bisphosphonate use. Although information regarding the surgical treatment of these atypical femoral fractures is increasing, it is unclear if the preventive operation is useful in incomplete fractures. This study examined the results of preventive intramedullary nailing for incomplete atypical femoral fractures. Material and Methods. A retrospective search was conducted for patients older than 50 years receiving bisphosphonate therapy, with incomplete, nondisplaced fractures in either the subtrochanteric or diaphyseal area of the femur. Seventeen patients with a total of 20 incomplete, non-displaced lesions were included. The mean duration of bisphosphonate use was 50.5 months. Eleven of the 17 (64.7%) patients had complete or incomplete fractures on the contralateral femur. All were treated with prophylactic fixation of an intramedullary (IM) nail. The minimum followup was 12 months. Results. All cases healed with a mean period of 14.3 weeks. Nineteen of the 20 cases healed with the dissolution of incomplete fractures of the lateral aspect. A complete fracture developed at the time of nailing in one patient, but it healed with callus bridging. Conclusion. IM nailing appears to be a reliable way of preventing the progress of incomplete atypical femoral fractures.
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- 2013
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11. An Analysis of the Scenario of China’s Invasion of Taiwan and Implications for South Korea-U.S.-Japan Security Cooperation
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Ki-Chul Park
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General Earth and Planetary Sciences ,General Environmental Science - Published
- 2023
12. Contested War Ethics in Light of Future Warfare Trends : Focus on Just War Theory
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Ju-Hoon Park and Ki-Chul Park
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- 2022
13. Low concentrations of tricyclic antidepressants stimulate TRPC4 channel activity by acting as an opioid receptor ligand
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Byeongseok Jeong, Young Pyo Song, Ji Yeon Chung, Ki Chul Park, Jin Hyeong Kim, Insuk So, and Chansik Hong
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Physiology ,Cell Biology - Abstract
Traditionally prescribed for mood disorders, tricyclic antidepressants (TCAs) have shown promising therapeutic effects on chronic neuralgia and irritable bowel syndrome. However, the mechanism by which these atypical effects manifest is unclear. Among the proposed mechanisms is the well-known pain-related inhibitory G-protein coupled receptor (GiPCR), namely, the opioid receptor (OR). Here, we confirmed that TCA indeed stimulates OR and regulates the gating of TRPC4, a downstream signaling of the Gi-pathway. In an ELISA to quantify the amount of intracellular cAMP, a downstream product of OR/Gi-pathway, treatment with amitriptyline (AMI) showed a decrease in [cAMP]i similar to that of the μOR agonist. Next, we explored the binding site of TCA by modeling the previously revealed ligand-bound structure of μOR. A conserved aspartate residue of ORs was predicted to participate in salt bridge interaction with the amine group of TCAs, and in aspartate-to-arginine mutation, AMI did not decrease the FRET-based binding efficiency between the ORs and Gαi2. As an alternative way to monitor the downstream signaling of Gi-pathway, we evaluated the functional activity of TRPC4 channel, as it is well known to be activated by Gαi. TCAs increased the TRPC4 current through ORs, and TCA-evoked TRPC4 activation was abolished by an inhibitor of Gαi2 or its dominant-negative mutant. As expected, TCA-evoked activation of TRPC4 was not observed in the aspartate mutants of OR. Taken together, OR could be proclaimed as a promising target among numerous binding partners of TCA, and TCA-evoked TRPC4 activation may help to explain the nonopioid analgesic effect of TCA.
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- 2023
14. Surgical Outcomes of Percutaneous Pinning and Open Locking Plating in Patients With Intra-articular Fractures of the Base of the Fifth Metacarpal
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Jung Il Lee, Jong Woong Park, Yong Jin You, Young Hoon Jo, and Ki-Chul Park
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Orthopedics and Sports Medicine ,Surgery - Published
- 2023
15. New Classification for Periprosthetic Distal Femoral Fractures Based on Locked-Plate Fixation Following Total Knee Arthroplasty: A Multicenter Study
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Jun-Ho Kim, Kang-Il Kim, Ki Chul Park, Oog-Jin Shon, Jae Ang Sim, and Gi Beom Kim
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Fracture Healing ,Fracture Fixation, Internal ,Treatment Outcome ,Humans ,Orthopedics and Sports Medicine ,Periprosthetic Fractures ,Arthroplasty, Replacement, Knee ,Bone Plates ,Femoral Fractures ,Retrospective Studies - Abstract
This study aimed to establish a new classification using locked-plate fixation for periprosthetic distal femoral fracture (PDFF) following total knee arthroplasty (TKA) and to determine when dual locked-plate fixation is necessary through defining this classification.One-hundred fifteen consecutive PDFFs that underwent operative treatment were reviewed from 2011 to 2019 with minimum 1-year follow-up. Most PDFFs were fixed with single or dual locked-plate fixations using the minimally invasive plate osteosynthesis technique. Based on preoperative radiographs, PDFFs were classified according to the level of main fracture line relative to the anterior flange of femoral component: type I and II, main fracture line located proximal and distal to the anterior flange; and type III, component instability regardless of fracture line requiring revisional TKA. Furthermore, type II fractures were subclassified based on the direction of fracture beak as follows: type IIIncidences of type I, IIThe new classification provides practical and obvious strategies for the treatment of PDFF following TKA using locked-plate fixation. For type II
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- 2022
16. North Korea’s A2AD Threats and Implications on Transforming ROK Naval Force Strategy
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Ki-Chul Park
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- 2022
17. NATO’s Nuclear Sharing Strategy and It’s Implications For the Establishing a New Strategy for Strengthening Extended Deterrence on the Korean Peninsula
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Ki-Chul Park and Jae-Woo Choo
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- 2022
18. A Study on the Demonstration of Quality Circle on TPM Performance
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Ki-Chul Park and Ho-Yeon Chung
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- 2021
19. Radiographic outcomes and factors affecting nonunion after intramedullary nailing in femur segmental fracture: a multicenter study
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Incheol Kook, Ki-Chul Park, Dong-Hong Kim, Oog-Jin Sohn, and Kyu Tae Hwang
- Abstract
Factors affecting the outcomes of femoral shaft segmental fractures are currently unknown. We evaluated the outcomes after intramedullary (IM) nail fixation and investigated the factors affecting nonunion in femoral shaft segmental fractures. A total of 38 patients who underwent IM nail fixation for femoral shaft segmental fractures (AO/OTA 32C2) at three university hospitals with a minimum 1-year follow-up was reviewed retrospectively. All patients were divided into the union group (n = 32) and the nonunion group (n = 6). We analyzed smoking status, diabetes mellitus, location of the segmental fragment, segment comminution, filling of the IM nail in the medullary canal, residual gap at the fracture site, use of a cerclage wire or blocking screws as factors that may affect the surgical outcome. In the union group, the average union time was 5.4 months (4–9 months). In the nonunion group, five cases underwent additional surgery at an average of 7.2 months (5–10 months) postoperatively, and one case was asymptomatic and followed-up without surgery. In the comparison of the union and nonunion group, insufficient canal filling of the IM nail (union: 25.0%, nonunion: 83.3%, p = 0.012) and residual gap at the fracture site after reduction (union: 31.3%, nonunion: 83.3%, p = 0.027) showed a significant difference. In multivariate analysis, insufficient canal filling of the IM nail was found to be a factor affecting nonunion, with an odds ratio of 13.3 (p = 0.036). After IM nail fixation for femoral shaft segmental fractures, a relatively high nonunion rate (15.8%) was observed. Factors affecting nonunion were insufficient canal filling of IM nail and residual gap of fracture site.
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- 2022
20. What Makes South Korean Perceive Happiness Lower Than Chinese and Japanese?
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Sang June Park, Rui Zhao, Yeong-Ran Lee, and Ki-Chul Park
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media_common.quotation_subject ,Happiness ,Psychology ,Social psychology ,media_common - Published
- 2021
21. Total hip arthroplasty for failed acetabular fracture: a double-center comparative study on failed proximal femur fracture
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Pil Whan Yoon, Jun Ki Moon, Ho Lee, Ki-Chul Park, Jae Suk Chang, and Ji Wan Kim
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Reoperation ,musculoskeletal diseases ,medicine.medical_specialty ,Sports medicine ,Arthroplasty, Replacement, Hip ,Periprosthetic ,Critical Care and Intensive Care Medicine ,medicine ,Humans ,Orthopedics and Sports Medicine ,Femur ,Survival rate ,Survival analysis ,Retrospective Studies ,Osteosynthesis ,Hip Fractures ,business.industry ,Acetabular fracture ,Acetabulum ,musculoskeletal system ,medicine.disease ,Surgery ,Treatment Outcome ,Radiological weapon ,Emergency Medicine ,Fracture (geology) ,Spinal Fractures ,business ,Femoral Fractures ,Follow-Up Studies - Abstract
This study aimed to compare the clinical and radiological outcomes of patients who underwent total hip arthroplasty (THA) after failed osteosynthesis of acetabular fractures vs. fractures of the proximal femur. This is a retrospective comparative study in two centers. A total of 110 patients who underwent THA after osteosynthesis of acetabular or proximal femur fractures were categorized into groups: group 1 (53 patients with acetabular fracture) and group 2 (57 patients with proximal femur fracture). The mean follow-up period was 6.3 (range 2–16.5) years. The Harris hip scores (HHSs), complications, radiological results, and Kaplan–Meier survival curves were evaluated. The mean preoperative HHSs of 39.4 (group 1) and 41.2 (group 2) were improved to 83.6 and 84.7 at the final follow-up (p
- Published
- 2021
22. A Case Study on the Success and Failure of Weapons of Mass Destructions Nonproliferation Regimes: Determinants of Great Power’s Commitment
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Ki-Chul Park
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Great power ,Economic policy ,Economics - Published
- 2021
23. Influence of extraction process on Cs isotope ratios for Fukushima Daiichi nuclear power plant accident-contaminated soil
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Mami Yuki, Hanako Miura, Ki Chul Park, Hiroaki Takahashi, Masao Nomura, Hiroki Shibahara, Yukiko Ohishi, and Takehiko Tsukahara
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Isotope ,Soil test ,Health, Toxicology and Mutagenesis ,Extraction (chemistry) ,Public Health, Environmental and Occupational Health ,Thermal ionization mass spectrometry ,Pollution ,Soil contamination ,Analytical Chemistry ,law.invention ,Nuclear Energy and Engineering ,law ,Scientific method ,Environmental chemistry ,Nuclear power plant ,Environmental science ,Radiology, Nuclear Medicine and imaging ,Clay minerals ,Spectroscopy - Abstract
The influence of extraction process on Cs isotope ratios was investigated by thermal ionization mass spectrometry (TIMS) for nitric-acid (HNO3) treatments of Fukushima Daiichi nuclear power plant accident-contaminated soil samples. In contrast to the consistent TIMS results for conc. HNO3 treatments at 90–200 °C, dilute HNO3 treatment provided a statistically significant 3.0‰-higher 135Cs/137Cs average isotope ratio than the conc. HNO3 treatment conducted at the same temperature. The higher isotope ratio is caused by a specific extraction process making detectable the deviated distribution of Cs isotopes in clay minerals or leading to matrix effects responsible for instrumental mass bias.
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- 2021
24. Outcomes of Angular Stable Locking System in Femoral Diaphyseal Fractures of Elderly Patients: A Multicenter Comparative Study.
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Kyu Tae Hwang, Incheol Kook, Jae-Ho Lee, Chang-Wug Oh, Oog-Jin Sohn, Ji Wan Kim, and Ki-Chul Park
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- 2023
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25. Comparison of tibial plateau fracture surgical outcomes between young and elderly patients: are outcomes really poorer in the elderly?
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Oog Jin Shon, Joon Kuk Kim, Hyun Soh, Kyu Tae Hwang, and Ki-Chul Park
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medicine.medical_specialty ,medicine.medical_treatment ,Radiography ,Arthritis ,Fracture Fixation, Internal ,03 medical and health sciences ,0302 clinical medicine ,medicine ,Tibial plateau fracture ,Humans ,Internal fixation ,Orthopedics and Sports Medicine ,Risk factor ,Ao classification ,Reduction (orthopedic surgery) ,Aged ,Retrospective Studies ,030222 orthopedics ,business.industry ,030229 sport sciences ,General Medicine ,Middle Aged ,medicine.disease ,Surgery ,Tibial Fractures ,Treatment Outcome ,Orthopedic surgery ,business - Abstract
Several studies have reported that total knee arthroplasty (TKA) is a suitable solution to treat elderly patients with complex tibial plateau fractures. The purpose of the present study was to compare surgical treatment outcomes after open reduction internal fixation (ORIF) between elderly and younger patients.We reviewed patients with plateau fracture (OTA/AO classification types 41B and 41C) who underwent ORIF at two academic trauma centers between November 2006 and October 2019. Of the 341 patients, 76 were ultimately included in the younger group ( 60 years old) and 77 in the elderly group (≥ 60 years). The average follow-up was 24 months (range 12-96 months). The primary outcome was any common complication of plateau fracture, namely post-traumatic arthritis and alignment change. Conversion to TKA, Reduction loss, coronal malalignment, non-union, union time, infection, and limb length discrepancy (LLD) were also assessed.The elderly group had a significantly higher prevalence of diabetes, but there were no other significant differences between the groups in terms of patient demographics, fracture characteristics, and operation characteristics. We detected no differences between the groups in terms of post-traumatic arthritis (p = 0.216), alignment change (p = 0.093), conversion to TKA (p = 0.681), reduction loss (p = 0.079), coronal malalignment (p = 0.484), non-union rate (p = 0.719), infection (p = 0.063), LLD (p = 0.154), or time to union (p = 0.513). Logistic regression analysis revealed that age 60 years was not associated with treatment failure, defined as either post-traumatic arthritis greater than grade II or non-union (p = 0.468). OTA/AO classification type 41C2 (p = 0.019), type 41C3 (p = 0.008), and malreduction (p = 0.050) were significant risk factors for failure.Age ≥ 60 years is not an independent risk factor of poor radiographic outcome and high complication rate in tibial plateau fractures. This indicates that ORIF is still a good solution to treat elderly patients, similar to their younger counterparts.
- Published
- 2021
26. Preparation and Physical Properties of Plastic Shock Tubes
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Ki Chul Park and Dae Su Kim
- Published
- 2020
27. Excellent outcomes after double-locked plating in very low periprosthetic distal femoral fractures
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Joon Woo Kim, Jong Keon Oh, Chang Wug Oh, Ki-Chul Park, Kyeong-Hyeon Park, Hee Soo Kyung, Hee June Kim, and Yong Cheol Yoon
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Male ,medicine.medical_specialty ,Knee Joint ,Radiography ,Periprosthetic ,Locked plating ,medicine.disease_cause ,Weight-bearing ,Fracture Fixation, Internal ,03 medical and health sciences ,Postoperative Complications ,0302 clinical medicine ,Humans ,Medicine ,Orthopedics and Sports Medicine ,Femur ,Ao classification ,Aged ,Aged, 80 and over ,030222 orthopedics ,business.industry ,030229 sport sciences ,General Medicine ,Middle Aged ,Surgery ,Treatment Outcome ,Orthopedic surgery ,Female ,Periprosthetic Fractures ,business ,Bone Plates ,Femoral Fractures - Abstract
Very low periprosthetic distal femur fractures (PPDFFs) are rare injuries and often have a relatively high failure rate after single lateral locked plating. The double plating technique yields good outcomes in osteoporotic fractures of the distal femur. To date, there is limited information on double-locked plate fixation of very low PPDFFs. This study aimed to evaluate the outcomes and complications of surgically treated very low PPDFFs using double-locked plate fixation. Between January 2013 and December 2018, sixty-one consecutive patients with PPDFFs have been conducted. Only Su type III PPDFFs with double-locked plate fixation through a lateral minimally invasive approach and a medial subvastus approach to the distal femur were analyzed. Patients were encouraged to perform straight leg raising exercises and active knee motion on the second postoperative day. Assisted weight bearing from the early postoperative days was supported, and full weight-bearing was allowed after healing the fracture site. All patients were evaluated according to the time to union, limb alignment, range of knee motion, Knee Society Score, and presence of complications. Twenty one patients (17 females and 4 males, mean age 76 years, range 56–90) were included in the study. There were 10 of 33-A1, 6 of 33-A2 and 5 of 33 A3 fractures, according to the AO classification. Of 21 patients, 20 achieved union at an average of 14 weeks postoperatively. Postoperative limb alignment was satisfactory in all cases, with an average mechanical distal lateral femur angle of 89° and average mechanical posterior distal femur angle of 86°. All patients recovered the knee joint motion similar to that of the contralateral side, and daily life pre-injury. The average knee and function scores were 94 and 89, respectively. There were one case of non-union and three cases of superficial wound infection, which resolved after intravenous antibiotic therapy. Double locked plating showed excellent radiographic and functional outcomes with few complications in patients with very low PPDFFs. Based on these promising results, we propose the consideration of double-locked plate fixation in the treatment of very low PPDFFs.
- Published
- 2020
28. Intramedullary nailing of subtrochanteric fractures in elderly patients: Comparative study of helical blade cephalomedullary nail versus reconstruction nail
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Yong-Cheol Yoon, Ki-Chul Park, Chang-Wug Oh, Joon-Woo Kim, Ji Wan Kim, Kyeong-Hyeon Park, Tae-Seong Kim, Hyung Keun Song, and Sharkawy Wagih Abdel Baki
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Fracture Healing ,Male ,Treatment Outcome ,Hip Fractures ,General Earth and Planetary Sciences ,Humans ,Female ,Bone Nails ,Hand ,General Environmental Science ,Aged ,Fracture Fixation, Intramedullary ,Retrospective Studies - Abstract
Intramedullary nailing (IMN), which is a common method for treating subtrochanteric fractures, is conducted as cephalomedullary (CMN) or reconstruction (RCN) nailing. Numerous studies have reported the effectiveness of CMN, which requires a shorter surgery time and provides stronger fixation strength with blade-type devices. However, the radiographic and clinical outcomes of the use of CMN and RCN in elderly patients aged ≥65 years have not been compared yet. This study aimed to investigate whether CMN offers superior outcomes over RCN in the treatment of subtrochanteric fractures in elderly patients.This retrospective study included 60 elderly patients (17 men and 43 women; mean age: 74.9 years) diagnosed with subtrochanteric fractures and treated with IMN with helical blade CMN (CMN group: 30 patients) or RCN (RCN group: 30 patients) between January 2013 and December 2018 with at least 1 year of follow-up period. Radiologic outcomes were evaluated based on the postoperative state of alignment and the achievement and timing of bony union at the final follow-up. Clinical outcomes were evaluated using the Merle d'Aubigné-Postel score. Radiologic and clinical outcomes in the two groups were compared and analyzed, and the occurrence of complications was examined.The difference in malalignment between the two groups was not significant; however, the RCN group achieved more effective reduction. At the final follow-up, bony union was achieved within 18.9 weeks, on average, in 28 patients in the CMN group and within 21.6 weeks, on average, in 27 patients in the RCN group. Twenty patients in the CMN group and 26 in the RCN group showed good or better results according to the Merle d'Aubigné-Postel score. No significant differences were found for any of the parameters.In the treatment of difficult subtrochanteric fractures in elderly patients, RCN can provide excellent reduction and strong fixation similar to CMN and can result in outstanding clinical and radiologic outcomes.
- Published
- 2022
29. Spontaneously Resolved Lumbar Artery Injury after Blunt Trauma
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Seung Hyuk Nam, Sun Kyun Ro, Ki Chul Park, Jin Hwan Cheong, and Je Il Ryu
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030222 orthopedics ,medicine.medical_specialty ,Interventional treatment ,medicine.diagnostic_test ,business.industry ,Abdominal aorta ,030208 emergency & critical care medicine ,Surgery ,03 medical and health sciences ,0302 clinical medicine ,Blunt trauma ,Treatment modality ,medicine.artery ,Angiography ,medicine ,business ,Lumbar arteries ,Major bleeding - Abstract
Major bleeding caused by vascular injuries of the abdominal aorta or its branches after blunt trauma often leads to mortality or major morbidity. We report a case that lumbar artery injury following blunt trauma was spontaneously resolved without any surgical or interventional treatment. Lumbar artery injury after blunt trauma could be treated conservatively without surgical or interventional treatment in a selected case. When an aortic or its branch injury was suspicious, diagnostic angiograms in the setting of interventional treatment may be helpful to decide an appropriate treatment modality.
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- 2020
30. Perioperative symptomatic venous thromboembolism after immediate chemoprophylaxis in patients with pelvic and lower-extremity fractures
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Ja Wook Koo, Jin Kyu Lee, Kyu-Tae Hwang, Soo Young Jeong, Ki-Chul Park, and Sihoon Choi
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Adult ,Male ,medicine.medical_specialty ,lcsh:Medicine ,030204 cardiovascular system & hematology ,Chemoprevention ,Article ,Fractures, Bone ,Young Adult ,03 medical and health sciences ,Sex Factors ,0302 clinical medicine ,Bones of Lower Extremity ,Multidetector Computed Tomography ,Epidemiology ,medicine ,Humans ,In patient ,cardiovascular diseases ,Enoxaparin ,Pelvic Bones ,lcsh:Science ,Aged ,Venous Thrombosis ,030222 orthopedics ,Fracture repair ,Multidisciplinary ,medicine.diagnostic_test ,business.industry ,Incidence (epidemiology) ,lcsh:R ,Anticoagulants ,Venous Thromboembolism ,Perioperative ,Middle Aged ,medicine.disease ,equipment and supplies ,Dabigatran ,Pulmonary embolism ,Surgery ,Risk factors ,Angiography ,Chemoprophylaxis ,Female ,lcsh:Q ,Pulmonary Embolism ,business ,Venous thromboembolism - Abstract
The purpose of this study was to investigate the incidence of symptomatic venous thromboembolism (VTE) after chemoprophylaxis in patients with pelvic and lower-extremity fractures, and to identify risk factors for VTEs in this subgroup of patients. To detect VTE, multi-detector computed tomography (CT) angiography was performed. Of 363 patients assessed, the incidence of symptomatic VTE was 12.4% (45 patients), and the incidence of symptomatic PE was 5.2% (19 patients). For the risk-factor analysis, a higher Charlson comorbidity index (p = 0.037), and a history of external fixator application (p = 0.007) were associated with increased VTE risk. Among patients who had VTE, male sex (p = 0.017), and above-the-knee fractures (p = 0.035) were associated with increased pulmonary embolism (PE) risk. In conclusions, the incidence of VTE in post-traumatic patients is not low after chemoprophylaxis. Risk factors for VTE and PE are different among patients with pelvic and lower-extremity fractures.
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- 2020
31. Mid-term outcomes after the surgical treatment of atypical femoral fractures : minimum three-year follow-up
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Ki-Chul Park, Chang Wug Oh, Oog Jin Sohn, Ji Wan Kim, Kyu-Tae Hwang, Young-Ho Cho, Joon-Woo Kim, and Soo Young Jeong
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Male ,medicine.medical_specialty ,Time Factors ,Nonunion ,Fracture site ,Postoperative Complications ,Atypical femoral fracture ,Risk Factors ,medicine ,Humans ,Orthopedics and Sports Medicine ,Risk factor ,Surgical treatment ,Aged ,Retrospective Studies ,Aged, 80 and over ,business.industry ,Incidence (epidemiology) ,Middle Aged ,medicine.disease ,Surgery ,Treatment Outcome ,Delayed union ,Female ,Peri-Implant Fractures ,business ,Femoral Fractures ,Follow-Up Studies - Abstract
Aims The incidence of atypical femoral fractures (AFFs) continues to increase. However, there are currently few long-term studies on the complications of AFFs and factors affecting them. Therefore, we attempted to investigate the outcomes, complications, and risk factors for complication through mid-term follow-up of more than three years. Methods From January 2003 to January 2016, 305 patients who underwent surgery for AFFs at six hospitals were enrolled. After exclusion, a total of 147 patients were included with a mean age of 71.6 years (48 to 89) and 146 of whom were female. We retrospectively evaluated medical records, and reviewed radiographs to investigate the fracture site, femur bowing angle, presence of delayed union or nonunion, contralateral AFFs, and peri-implant fracture. A statistical analysis was performed to identify the significance of associated factors. Results The mean follow-up period was 70.2 months (36 to 191). There were 146 AFFs (99.3%) in female patients and the mean age was 71.6 years (48 to 89). The AFFs were located in the subtrochanter and shaft in 52 cases (35.4%) and 95 (64.6%), respectively. The preoperative mean anterior/lateral femoral bowing angles were 10.5° (SD 5.7°)/6.1° (SD 6.2°). The postoperative mean anterior/lateral bowing values were changed by 8.7° (SD 5.4°)/4.6° (SD 5.9°). Bisphosphonates had been used contemporarily in 115 AFFs (78.2%) for a mean of 52.4 months (1 to 204; SD 45.5) preoperatively. Nailing was performed in 133 AFFs (90.5%), and union was obtained at a mean of 23.6 weeks (7 to 85). Delayed union occurred in 41 (27.9%), and nonunion occurred in 13 (8.8%). Contralateral AFF occurred in 79 patients (53.7%), and the use of a bisphosphonate significantly influenced the occurrence of contralateral AFFs (p = 0.019). Peri-implant fractures occurred in a total of 13 patients (8.8%), and a significant increase was observed in cases with plating (p = 0.021) and high grade of postoperative anterolateral bowing (p = 0.044). Conclusion The use of a bisphosphonate was found to be a risk factor for contralateral AFF, and high-grade postoperative anterolateral bowing and plate fixation significantly increased the occurrence of peri-implant fractures. Long-term follow-up studies on the bilaterality of AFFs and peri-implant fractures are warranted. Cite this article: Bone Joint J 2021;103-B(11):1648–1655.
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- 2021
32. Infographic: Mid-term outcomes after the surgical treatment of atypical femoral fractures : minimum three-year follow-up
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S-Y. Jeong, Y-H. Cho, J-W. Kim, Ji Wan Kim, K-T. Hwang, C-W. Oh, Ki-Chul Park, and Oog Jin Sohn
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Aged, 80 and over ,Male ,medicine.medical_specialty ,Bone Density Conservation Agents ,business.industry ,Middle Aged ,Lower limb ,Surgery ,Term (time) ,Fracture Fixation, Internal ,Postoperative Complications ,Risk Factors ,Medicine ,Humans ,Orthopedics and Sports Medicine ,Female ,Peri-Implant Fractures ,business ,Surgical treatment ,Bone Plates ,Femoral Fractures ,Plate fixation ,Aged ,Follow-Up Studies - Published
- 2021
33. Experimental Study on Hydraulic Performance of Tiecell Caisson Breakwater with Wave Chamber
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In-Chul Kim, Ki-Chul Park, and Tae-Wook Kang
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Ecology ,Caisson breakwater ,Wave force ,Rubble ,engineering ,Caisson ,Model test ,Geotechnical engineering ,engineering.material ,Geology ,Earth-Surface Processes ,Water Science and Technology ,Marine safety - Abstract
Kim, I.-C.; Park, K., and Kang, T.-W., 2021. Experimental study on hydraulic performance of tiecell caisson breakwater with wave chamber. In: Lee, J.L.; Suh, K.-S.; Lee, B.; Shin, S., and Lee, J. (eds.), Crisis and Integrated Management for Coastal and Marine Safety. Journal of Coastal Research, Special Issue No. 114, pp. 81–85. Coconut Creek (Florida), ISSN 0749-0208. Recently, a perforated caisson breakwater with tiecell blocks was developed to improve a water affinity and people's safety of a rubble mound armoured by tetrapods. In this study, hydraulic model tests were performed to examine the hydraulic performance of a non-porous and a tiecell caissons with perforated blocks attacking wave against a small fishery harbor near Busan. The model test results show that the tiecell caisson is more effective in dissipating wave energy under normal wave conditions and in reducing wave overtopping rates under design wave conditions than the non-porous caisson. It is found that the horizontal wave forces acting on the tiecell caisson show slightly more large than the non-porous caisson due to the impulsive force generated in the wave chamber.
- Published
- 2021
34. Facteurs prédictifs de la pseudarthrose d’une fracture de la styloïde ulnaire non fixée associée aux fractures du radius distal chez des patients traités par plaque palmaire verrouillée et leurs effets sur les résultats fonctionnels
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Jung Il Lee, Jong Woong Park, Ki-Chul Park, Dong Hong Kim, and Duk Hee Lee
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Orthopedics and Sports Medicine ,Surgery - Published
- 2022
35. Predictors for nonunion of unrepaired ulnar styloid fracture associated with distal radius fractures in patients treated with volar locking plate fixation and their effect on functional outcomes
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Jung Il Lee, Jong Woong Park, Ki-Chul Park, Dong Hong Kim, and Duk Hee Lee
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Radiography ,Fracture Fixation, Internal ,Treatment Outcome ,Case-Control Studies ,Humans ,Orthopedics and Sports Medicine ,Surgery ,Range of Motion, Articular ,Radius Fractures ,Bone Plates ,Ulna Fractures ,Retrospective Studies - Abstract
Nonunion of ulnar styloid fractures after radius stabilisation by volar locking plate (VLP) fixation without surgical fixation on ulnar styloid fractures is quite common. However, the factors affecting the nonunion of ulnar styloid fractures and their effect on functional outcomes in patients with distal radius fractures (DRFs) treated with VLP fixation are unclear.The purpose of this study was to investigate the predictors affecting nonunion of unrepaired ulnar styloid fractures in patients with DRFs and the effect of nonunion and its predictors on functional outcomes.We retrospectively reviewed data from 84 patients with DRF who underwent VLP fixation. None of the accompanying ulnar styloid fractures were manipulated during the surgery. Postoperative evaluation included the measurement of the grip strength, wrist range of motion, and Disabilities of the Arm, Shoulder, and Hand score at a minimum of one year postoperatively. Patients were divided into the nonunion and union groups according to the presence of union of ulnar styloid fracture. Demographic and radiologic parameters, including age, sex, bone mineral density, location and displacement distance of ulnar styloid fracture, and fracture pattern of DRFs, were analysed to identify predictors of nonunion. Functional outcomes were compared between the two groups and were compared according to the presence of predictors of nonunion.Univariate analysis revealed that the nonunion rate was higher in ulnar styloid non-base fractures, substantial displacement (≥1.9mm) of ulnar styloid fracture, and AO/OTA C-type DRF. However, multivariate logistic regression analysis showed that non-base fractures and substantial displacement were significant predictors. Accompanying ulnar styloid fracture nonunion and its predictors were found not to influence functional outcomes.Substantial displacement and non-base fracture are predictive factors for nonunion of unrepaired ulnar styloid fractures after DRF treatment with VLP fixation. However, nonunion and its predictors do not influence the overall wrist function. These findings suggest that the ulnar styloid fracture accompanying DRF should not be considered a fracture affecting the wrist function when treating with VLP fixation.III, Retrospective, Case Control study.
- Published
- 2022
36. Experimental Study on Hydraulic Performance of Perforated Caisson Breakwater with Turning Wave Blocks
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Ki-Chul Park and In-Chul Kim
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Reflection coefficients ,Caisson breakwater ,Wave overtopping rates ,Turning wave blocks caisson ,lcsh:Ocean engineering ,lcsh:TC1501-1800 ,Geotechnical engineering ,Wave forces ,Geology ,Non-porous caisson - Abstract
Recently, a perforated caisson breakwater with turning wave blocks was developed to improve the water affinity and public safety of a rubble mound armored by TTP. In this study, hydraulic model tests were performed to examine the hydraulic performance of a non-porous caisson and new caisson breakwater with perforated blocks for attacking waves in a small fishery harbor near Busan. The model test results showed that the new caisson was more effective in dissipating the wave energy under normal wave conditions and in reducing the wave overtopping rates under design wave conditions than the non-porous caisson. It was found that the horizontal wave forces acting on the perforated caisson were slightly larger than those on the non-porous caisson because of the impulsive forces on the caisson with the turning wave blocks.
- Published
- 2019
37. Fragility Fracture Systems: International Perspectives - Asia & Australia
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Seth M, Tarrant, Ji Wan, Kim, Takashi, Matsushita, Hiroaki, Minehara, Tomoyuki, Noda, Jong-Keon, Oh, Ki Chul, Park, Noriaki, Yamamoto, and Zsolt J, Balogh
- Subjects
General Medicine - Abstract
The incidence and burden of fragility fractures have reached the level where comprehensive systematic care is warranted to optimize the care of these patients. Hip fractures are the most frequently lethal and independence level changing fragility fractures, responsible for 30-day mortality comparable to high-energy trauma patients with injury severity scores over 12. It is a reasonable expectation that countries have a hip fracture treating system of care in place for this high-risk population. This review explores the systems of care from the Asia-Pacific Perspective.From the International Orthopaedic Trauma Association's member societies, nations from the Asia-Pacific Region were requested to contribute with an overview of their fragility fracture management systems. The content or the review was standardized by a template of headings, which each country endeavored to cover.Australia, Japan, and South Korea contributed voluntarily from the 5 member countries of the region. Each country has made considerable efforts and achievements with diverse approaches to standardize and improve the care of fragility fractures, particularly hip fractures. Beyond the individual nations' efforts there is also an existing Asia-Pacific Collaborative. The data collection and in some counties the existence of a registry is promising; funding and recognition of the problem among competing health care budget priorities are common.Our review covers some of the countries with strongest economy and highest health care standards. The lack of a universal robust system for hip fracture care is apparent. The data collection from registry initiations is expected to drive system development further in these countries and hopefully fast track the development in other countries within the most populous geographical region of the Earth.
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- 2022
38. Acetabular fractures in elderly
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Ki Chul Park, Chang-Wug Oh, Joon-Woo Kim, Hyoung Keun Oh, Hyun Chul Shon, Jung Jae Kim, and Ji Wan Kim
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Orthopedics and Sports Medicine ,Surgery - Abstract
This study aimed to determine characteristics of acetabular fractures in the elderly by evaluating clinical course and computed tomography-based radiological features between low- and high-energy acetabular fractures.We reviewed 178 consecutive patients with acetabular fractures aged ≥60 years from six centers. Low-energy fractures (group 1) were identified in 23 (12.9%) patients and high-energy fractures (group 2) in 155 (87.1%) patients. We compared demographics, radiological findings, and clinical course between the groups.Average age (70.6 vs. 67.8 years, p = 0.046) and ratio of females (47.8% vs. 23.2%, p = 0.021) were significantly higher in group 1 than in group 2. The Charlson comorbidity index was also higher in group 1, but no other demographics showed difference. More patients in group 2 than in group 1 underwent surgery (91.6% vs. 73.9%); however, more in group 1 underwent minimally invasive surgery (17.4% vs 4.5%). Anterior column-associated fracture patterns occurred in 91.4% and 38.7% of cases in groups 1 and 2, respectively. Most fractures were displaced (2 mm); 68% of which were comminuted. Furthermore, 24.2% of the fractures had superior dome impaction, whereas 23.0% were associated with posterior wall impaction.Patients who sustained low-energy acetabular fractures were mostly women, were older, and had more comorbidities. Radiological findings of low-energy acetabular fractures showed anterior column involvement associated with injury to the quadrilateral surface. Additionally, it was observed to be commonly combined with comminution and impacted fragments.
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- 2020
39. Fragility Fracture Systems: International Perspectives - Asia & Australia.
- Author
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Tarrant, Seth M., Ji Wan Kim, Takashi Matsushita, Hiroaki Minehara, Tomoyuki Noda, Jong-Keon Oh, Ki Chul Park, Noriaki Yamamoto, and Balogh, Zsolt J.
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- 2022
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40. Clinical outcomes and affecting factors of ipsilateral femoral neck and shaft fractures - Multination, multicenter analysis
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Chang-Wug Oh, Joon-Woo Kim, Ki Chul Park, Theerachai Apivatthakakul, Cong-Feng Luo, Merng Koon Wong, Frankie KL. Leung, and Ji Wan Kim
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Orthopedics and Sports Medicine ,Surgery - Abstract
This study aimed to evaluate the clinical outcomes of ipsilateral femoral neck and shaft fractures and identify the risk factors associated with missed diagnosis of femoral neck fractures and clinical outcomes of this fracture.The ipsilateral femoral neck and shaft fractures from seven centers were retrospectively reviewed. Data on injury mechanism, fracture pattern, and fracture classification; surgical factors including fixation method; and timing of detection of femoral neck fracture were analyzed. The clinical outcomes, complications, and the incidence of avascular necrosis of the femoral head (AVNFH) were reviewed. Risk factors for missed femoral neck fracture and complications were analyzed.In total, 74 patients with an average age of 43.6 years were included. Of the femoral shaft fractures, 56.8% were type A, 21.6% were type B, and 21.6% were type C. Sixteen patients had an open fracture of the femoral shaft. Femoral neck fracture was initially missed in 27% patients and the timing of delayed diagnosis was at an average of 11.1 days after injury. For detecting femoral neck fractures, minimal displacement of the femoral neck fracture was a risk factor, whereas computed tomography (CT) was a protective factor. The incidence of AVNFH was 6.8% at an average of 36.8 months after injury. The AVNFH group had more displaced femoral neck fractures at the time of surgery, but there was no difference in the timing of diagnosis compared to non-AVNFH group. The femoral shaft showed considerable healing problems, with an average union time of 29.7 weeks and a 20.2% nonunion rate.Ipsilateral femoral neck and shaft fractures had a high rate of missed diagnosis, especially in minimally displaced fractures; however, CT was a protective factor. AVNFH occurred in 6.8% and was related to femoral neck fracture displacement, but not delayed diagnosis. The femur nonunion rate was high, which warrants attention.
- Published
- 2020
41. Extraskeletal osteosarcoma misdiagnosed as heterotopic ossification after periprosthetic femoral fracture: A case report
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Il Hoon Sung, Jin Sung Park, Hee Jung Son, Ki-Chul Park, and Young Sik Song
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musculoskeletal diseases ,medicine.medical_specialty ,Extraskeletal Osteosarcoma ,Osteoid ,business.industry ,medicine.medical_treatment ,Soft tissue ,Periprosthetic ,Case Report ,General Medicine ,Femoral fracture ,medicine.disease ,lcsh:RD701-811 ,lcsh:Orthopedic surgery ,medicine ,Internal fixation ,Orthopedics and Sports Medicine ,Surgery ,Heterotopic ossification ,Radiology ,Differential diagnosis ,business - Abstract
Extraskeletal osteosarcoma is a malignant tumor of soft tissue characterized by osteoid production and has a very low prevalence, comprising approximately 4% of all osteosarcomas and about 1% of all soft tissue sarcomas, and a total of about 350 cases have been reported until now. Heterotopic ossification is a pathological finding of bony tissue in soft tissue regions such as muscle, skin and subcutaneous tissue. We report a case of an 86-year-old woman with a history of total hip arthroplasty (THA), in which open reduction and internal fixation were done for periprosthetic femoral Fracture. The ossified lesion misdiagnosed as heterotopic ossification initially was diagnosed as extraskeletal osteosarcoma at 6 months after the surgery. Both extraskeletal osteosarcoma and heterotopic ossification have no definite symptoms, but show radiopaque shadows on simple radiograph. Therefore, careful attention and thorough evaluation with multiple imaging tests may be necessary for the differential diagnosis of these entities.
- Published
- 2020
42. Expansion of Ion Effects on Water Induced by a High Hydrophilic Surface of a Polymer Network
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Ki Chul Park and Takehiko Tsukahara
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chemistry.chemical_classification ,Chemistry ,Inorganic chemistry ,Salt (chemistry) ,Cooperativity ,Surfaces and Interfaces ,Condensed Matter Physics ,Alkali metal ,Ion ,Self-healing hydrogels ,Electrochemistry ,Copolymer ,Osmotic pressure ,Molecule ,General Materials Science ,Spectroscopy - Abstract
The spatial extent and anion-cation cooperativity of the ion effect on the structure and dynamics of water have long been debated but are still controversial. Previously, we experimentally demonstrated the extensive and cooperative effect of ions on water in a polyamide network by measuring the reflection wavelength (λ) on the ion sensor of poly(N-isopropylacrylamide) (PNIPAAm) hydrogel-immobilized photonic crystals. In the present study, we investigated the influence of the polymer surface on the ion effect by adopting a highly hydrophilic poly(N-isopropylacrylamide-co-N-acryloylaza-18-crown-6) hydrogel as a sensor matrix. In alkaline earth metal salt solutions, the copolymer hydrogel membrane sensor showed the redshift of λ for the specific combination of cations and anions, that is, Ca2+/Cl- and Sr2+/NO3-, which resulted from the concerted binding of ion pairs to the copolymer receptor. In alkali metal salt solutions, the ion sensor showed the blueshift of λ originating from the osmotic dehydration suppressed by the salts. The strength of the ion effect was evaluated by the average osmotic pressure (ΠA) required for the salt-inhibited dehydration in the early stage of hydrogel contraction. From the calculation results of ΠA for the copolymer and PNIPAAm hydrogels, it was found that the high hydrophilic copolymer surface more significantly enhanced the ion effect of structure-making cations (i.e., Li+) compared with borderline (Na+) and structure-breaking (K+ and Cs+) cations. Furthermore, the ion effect exhibited the higher ion cooperativity in combination with chloride anions than with nitrate anions. The enhancement of the long-range cooperative ion effect is derived from the expansion of the interactions between ions, water molecules, and the hydrophilic polymer network.
- Published
- 2019
43. Targoat: Improving Dataset Upload Time to Object Storage using Client-Server Cooperation
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Timothy John Ebido, Ki-Chul Park, and Kyungho Jeon
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Client–server model ,Object storage ,Upload ,SIMPLE (military communications protocol) ,Computer science ,Real-time computing - Abstract
This poster presents a technique to improve uploading datasets to Object Storage. By using client-side and server-side cooperative processing of merging and splitting, Targoat, our implementation of the technique, improves data movement time of datasets consist of many small objects. Our technique is simple, effective, and can be easily implemented in any Object Storage.
- Published
- 2019
44. Surgical outcomes of simple distal femur fractures in elderly patients treated with the minimally invasive plate osteosynthesis technique: can percutaneous cerclage wiring reduce the fracture healing time?
- Author
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Kyeu-Back Kwon, Ji Wan Kim, Jae-Ho Lee, Ki-Chul Park, and Seung-Jae Lim
- Subjects
medicine.medical_specialty ,Percutaneous ,Radiography ,medicine.medical_treatment ,Nonunion ,Bone healing ,03 medical and health sciences ,Fracture Fixation, Internal ,0302 clinical medicine ,medicine ,Humans ,Orthopedics and Sports Medicine ,Femur ,Reduction (orthopedic surgery) ,Retrospective Studies ,Fracture Healing ,030222 orthopedics ,business.industry ,030229 sport sciences ,General Medicine ,medicine.disease ,Sagittal plane ,Surgery ,medicine.anatomical_structure ,Treatment Outcome ,Coronal plane ,Orthopedic surgery ,business ,Bone Plates ,Femoral Fractures ,Bone Wires - Abstract
Achieving adequate reduction is difficult when performing minimally invasive plate osteosynthesis (MIPO) in elderly patients with simple distal femur fracture. This study aimed to evaluate the elderly patients who had undergone percutaneous wiring-assisted reduction with MIPO for simple distal femur fractures to determine the effect of this technique on reduction quality and fracture union. Between January 2009 and September 2017, 56 patients (56 femurs) with displaced simple distal femur fractures treated with MIPO at three trauma centers were finally enrolled. The MIPO technique with percutaneous cerclage wire reduction was performed in 25 patients (Group A). Among them, 12 patients had a simple spiral metaphyseal fracture (Group A*). In comparison, MIPO without percutaneous cerclage wire reduction was performed in 31 patients (Group B). Among them, seven patients had a simple spiral metaphyseal fracture (Group B*). Medical records containing surgical records were retrospectively reviewed to investigate demographic data, comorbidities, complications, operative time, and fluoroscopic time. Radiographs were evaluated for assessing the quality of the reduction and fracture union. The mean fracture union time of Group A* was 21.7 weeks, which was significantly shorter than that of Group B* (28.6 weeks). The mean coronal and sagittal angulation in Group A* was 0.6° and 0.7°, respectively, which were significantly lesser than those in Group B* (2.4° and 3.2°, respectively). Mean translation in Group A* was 1.43 mm, which was significantly shorter than that in Group B* (3.81 mm). Nonunion occurred in two patients in Group B. Surgical treatment of simple spiral distal femur fractures with percutaneous cerclage wiring-assisted reduction and the MIPO technique in elderly patients resulted in better reduction and faster union time. Therefore, this technique could be a good solution if used in accordance with the indication.
- Published
- 2019
45. Direct Extraction of Platinum Group Metals from Nitric Acid Solution Using the Phase Transition of Poly(N-isopropylacrylamide)
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Takehiko Tsukahara, Ki Chul Park, and Haruka Tateno
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Phase transition ,Extraction (chemistry) ,Cationic polymerization ,chemistry.chemical_element ,02 engineering and technology ,General Chemistry ,Platinum group ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Ruthenium ,Rhodium ,chemistry.chemical_compound ,chemistry ,Nitric acid ,Polymer chemistry ,Poly(N-isopropylacrylamide) ,0210 nano-technology - Abstract
Direct extraction of platinum group metals (PGMs) from nitric acid solutions based on the phase transition of thermoresponsive poly(N-isopropylacrylamide) (PNIPAAm) could be successfully performed. The results indicated that trivalent PGMs such as rhodium and ruthenium could be extracted onto PNIPAAm gel as the dissociated cationic complexes with hydrophobic soft donor ligands.
- Published
- 2018
46. Solid phase extraction based on the phase transition of poly(N-isopropylacrylamide): the extraction behaviour of lanthanide(<scp>iii</scp>) ions in highly acidic solutions
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Haruka Tateno, Takehiko Tsukahara, and Ki Chul Park
- Subjects
Fluid Flow and Transfer Processes ,Lanthanide ,Stripping (chemistry) ,Process Chemistry and Technology ,Extraction (chemistry) ,Inorganic chemistry ,Oxide ,Hydrochloric acid ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Catalysis ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Chemistry (miscellaneous) ,Nitric acid ,Poly(N-isopropylacrylamide) ,Chemical Engineering (miscellaneous) ,Solid phase extraction ,0210 nano-technology - Abstract
The present study investigates the applicability of poly(N-isopropylacrylamide) (PNIPAAm) as an extraction medium for trivalent lanthanide (Ln(III)) ions in high concentrations of nitric acid solutions by using octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) as an extracting agent. The extraction is based on the hydrophobic, co-aggregative binding of the Ln-CMPO nitrate complex formed in situ onto the PNIPAAm aggregates growing above the phase-transition temperature. The resulting co-aggregates enabled easy separation of the liquid and solid phases. The extraction of Ln(III) ions was affected by the efficiency and extent of complexation and the stability of the complex. Furthermore, the difference in the stability of Ln-CMPO complex species allowed for the stripping of Ln(III) ions in hydrochloric acid solutions.
- Published
- 2018
47. A Prospective Randomized Study on Operative Treatment for Simple Distal Tibial Fractures—Minimally Invasive Plate Osteosynthesis Versus Minimal Open Reduction and Internal Fixation
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Hyun Uk Kim, Ki-Chul Park, Chang Wug Oh, Joon-Woo Kim, and Ji Wan Kim
- Subjects
Adult ,Male ,medicine.medical_specialty ,medicine.medical_treatment ,Operative Time ,Open Fracture Reduction ,Fracture Fixation, Internal ,Young Adult ,03 medical and health sciences ,0302 clinical medicine ,Fracture fixation ,Bone plate ,medicine ,Humans ,Minimally Invasive Surgical Procedures ,Internal fixation ,Orthopedics and Sports Medicine ,Prospective Studies ,030212 general & internal medicine ,Aged ,Aged, 80 and over ,Fracture Healing ,030222 orthopedics ,business.industry ,Wound dehiscence ,Soft tissue ,General Medicine ,Middle Aged ,medicine.disease ,Surgery ,Tibial Fractures ,Treatment Outcome ,medicine.anatomical_structure ,Orthopedic surgery ,Female ,Ankle ,business ,Bone Plates - Abstract
Objectives To compare the radiologic and clinical results of minimally invasive plate osteosynthesis (MIPO) and minimal open reduction and internal fixation (ORIF) for simple distal tibial fractures. Design Randomized prospective study. Setting Three level 1 trauma centers. Patients Fifty-eight patients with simple and distal tibial fractures were randomized into a MIPO group (treatment with MIPO; n = 29) or a minimal group (treatment with minimal ORIF; n = 29). These numbers were designed to define the rate of soft tissue complication; therefore, validation of superiority in union time or determination of differences in rates of delayed union was limited in this study. Intervention Simple distal tibial fractures treated with MIPO or minimal ORIF. Main outcome measurements The clinical outcome measurements included operative time, radiation exposure time, and soft tissue complications. To evaluate a patient's function, the American Orthopedic Foot and Ankle Society ankle score (AOFAS) was used. Radiologic measurements included fracture alignment, delayed union, and union time. Results All patients acquired bone union without any secondary intervention. The mean union time was 17.4 weeks and 16.3 weeks in the MIPO and minimal groups, respectively. There was 1 case of delayed union and 1 case of superficial infection in each group. The radiation exposure time was shorter in the minimal group than in the MIPO group. Coronal angulation showed a difference between both groups. The American Orthopedic Foot and Ankle Society ankle scores were 86.0 and 86.7 in the MIPO and minimal groups, respectively. Minimal ORIF resulted in similar outcomes, with no increased rate of soft tissue problems compared to MIPO. Conclusions Both MIPO and minimal ORIF have high union rates and good functional outcomes for simple distal tibial fractures. Minimal ORIF did not result in increased rates of infection and wound dehiscence. Level of evidence Therapeutic Level II. See Instructions for Authors for a complete description of levels of evidence.
- Published
- 2018
48. Sodium chloride-catalyzed oxidation of multiwalled carbon nanotubes for environmental benefit
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Endo, Morinobu, Takeuchi, Kenji, Tajiri, Takeyuki, Ki Chul Park, Terrones, Mauricio, Dresselhaus, Mildred S., Feng Wang, Yoong-Ahm Kim, and Hayashi, Takuya
- Subjects
Nanotubes -- Structure ,Nanotubes -- Chemical properties ,Oxidation-reduction reaction -- Analysis ,Chemicals, plastics and rubber industries - Abstract
The effectiveness of sodium chloride as a catalyst for the oxidation of multiwalled carbon nanotubes (MWCNTs) was studied. The comparison of the kinetic parameters and the spectroscopic analyses reveal that the lowering of the oxidation temperature in the presence of NaCl results from the introduction of disorder into the graphitized MWCNTs, thus increasing the facility of the oxidation reaction of the disorder induced nanotubes.
- Published
- 2006
49. Factors affecting peri-implant fracture following locking plate for osteoporotic distal femur fractures
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Kyu-Tae Hwang, Seung-Jae Lim, Young Sik Song, and Ki-Chul Park
- Subjects
Male ,medicine.medical_specialty ,medicine.medical_treatment ,Osteoporosis ,Nonunion ,Periprosthetic ,Arthritis, Rheumatoid ,Fracture Fixation, Internal ,03 medical and health sciences ,Closed Fracture ,0302 clinical medicine ,Risk Factors ,medicine ,Humans ,Orthopedics and Sports Medicine ,030212 general & internal medicine ,Risk factor ,Arthroplasty, Replacement, Knee ,Aged ,Retrospective Studies ,Aged, 80 and over ,030222 orthopedics ,business.industry ,Femoral fracture ,Middle Aged ,Bisphosphonate ,medicine.disease ,Surgery ,Female ,Periprosthetic Fractures ,business ,Range of motion ,Bone Plates ,Femoral Fractures ,Osteoporotic Fractures - Abstract
Introduction The purpose of this study is to evaluate the outcomes and to analyze the risk factors for the occurrence of peri-implant fracture after treatment of osteoporotic distal femoral fractures using a locking plate. Hypothesis Risk factors affecting peri-implant fracture exist after locking plate fixation in osteoporotic distal femur fracture. Materials and methods Eighty-nine cases (88 patients) with osteoporotic distal femoral fractures were evaluated between January 2006 and January 2014. The cohort included 13 men and 76 women with a mean age of 70.4 (50–91). Mean duration of follow-up was 47.9 months (12 to 106). All patients with distal femoral fracture were treated with a locking compression plate. Bone mineralized densitometry measurement was obtained from all patients. Risk factors including sex, age, rheumatoid arthritis (RA), taking of bisphosphonate, primary or periprosthetic fracture after total knee arthroplasty (TKA), open or closed fracture, types of the most proximal screw (locking/cortical), and number of proximal screws were analyzed. Complication, union, time to union, and range of motion of knee were also evaluated. Results All patients had osteoporosis with the mean BMD of −3.16 (−2.5∼−5.4). The mean range of motion of knee was 126 degrees (90–145). Eighty-four cases (94.4%) showed union, the mean time to union was 14 weeks (10–42). Peri-implant fractures occurred in four patients (4.5%) after bone union at mean 37.5 months (14–62) postoperatively. Eight patients had angular deformities of over 5 degrees. Nonunion was observed in 5 cases and superficial wound infection in 2 cases. There were eight patients with RA, two of whom had suffered a peri-implant fracture. In statistical analysis, rheumatoid arthritis or periprosthetic fracture in TKA patients was a risk factor for peri-implant fracture ( P = 0.039, 0.019, respectively), and other factors showed no statistical differences. Conclusions Treatment using a locking plate showed favorable outcomes in osteoporotic distal femoral fractures. However, peri-implant fracture could occur in patients with RA or periprosthetic fracture after TKA. Therefore, cautious consideration is required for management of osteoporotic distal femur fracture in patients with RA or periprosthetic fracture after TKA. Analysis of more cases will be needed in order to achieve conclusive results. Level of evidence Therapeutic study, level IV (retrospective study). See the Guidelines for Authors for a complete description of levels of evidence.
- Published
- 2017
50. Minimally invasive plate augmentation in the treatment of long-bone non-unions
- Author
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Kyeong-Hyeon Park, Ki-Chul Park, Hee Soo Kyung, Chang Wug Oh, Jeong Heo, Jong Keon Oh, Joon Woo Kim, and Il Hyung Park
- Subjects
medicine.medical_specialty ,Radiography ,medicine.medical_treatment ,Long bone ,Bone grafting ,Non union ,law.invention ,Cohort Studies ,Intramedullary rod ,03 medical and health sciences ,0302 clinical medicine ,law ,medicine ,Humans ,Minimally Invasive Surgical Procedures ,Orthopedic Procedures ,Orthopedics and Sports Medicine ,Femur ,030222 orthopedics ,Tibia ,business.industry ,Implant failure ,030208 emergency & critical care medicine ,General Medicine ,Surgery ,medicine.anatomical_structure ,Orthopedic surgery ,Implant ,business ,Bone Plates - Abstract
Exchange nailing is most acceptable for treating hypertrophic non-union of the long bones, requiring the removal of previously fixed implant. However, its main effect of mechanical stabilization is controversial in non-isthmal area. We hypothesized that minimally invasive plate augmentation over the non-union site may have a better option, without the need of bone grafting or removing pre-existing implants. Seventeen patients with hypertrophic non-union of the long bones between 2010 and 2014 on radiography who previously underwent intramedullary (IM) nailing or plate osteosynthesis for long-bone fractures were included. A locking compression plate was inserted with at least three mono- or bicortical screws at each proximal and distal segment. Broken or loosened interlocking screws of IM nail were simultaneously re-fixed. Fracture site exposure, pre-fixed implant removal, and bone grafting were not performed. We investigated whether union occurred and analyzed functional outcomes and complications. Eleven femoral and six tibial non-unions were prospectively included. In the pre-existing implants, 13 nails and 4 plates were found. All cases achieved union at a mean 22.7 weeks. One case of superficial infection was managed with oral antibiotics. Deep infection or implant failure did not occur. Minimally invasive plate augmentation can achieve additional stability and promote healing of hypertrophic non-union of the long bones. When indicated, this technique is the least invasive alternative to exchange nailing and reduces surgical risks in the treatment of diaphyseal non-union.
- Published
- 2017
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