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Anterior cruciate ligament injury (ACL) of the knee is a severe traumatic injury that greatly decreases the function and sometimes leaves very important sequelae for the young patient so surgery for ligament reconstruction is the suitable treatment, there are several techniques for the elaboration of tunnels with difference in the portals, the methods of fixation and the different grafts used and each one of the authors defend their techniques giving their advantages and disadvantages and possible complications associated. The objective of this study was to assess the advantages or not of two approaches to the femoral side for the passage of the graft or implants. Material and methods: Two similar groups in this observational, transversal, retrospective and analytical study in patients operated by the same surgeon and assistants. In a period of time of three year, 80 patients were operated, 42 of them by medial portal and 38 of them via trans tibial. Results: The male sex in both groups was the predominant one, the parameters of ease were assessed to observe the passage of the tendon or graft, the passage of the femoral implant, the ease of the implant grip, the tension of the same and the operative time in both groups. The result was conclusive being an > p 0.06 contemplating the best result in patients operated by medial portal. [ABSTRACT FROM AUTHOR]

Lipoma is a tumor of adipose tissue cells that can develop in any part of the body; We present the case of an 86-year-old woman with a lesion of the left thigh as well as her diagnostic approach, specific surgical treatment and histopathological analysis. Three years after its resection, the function of the lower extremity was preserved. [ABSTRACT FROM AUTHOR]

Fluid hyperthermia has been used to treat various types of cancers, but its effects on bone have not been determined. The purpose of this prospective study was to show the structural and metabolic changes of bone exposed to fluid hyperthermia and the effects of the latter on bone healing. Thirty New Zealand rabbits were used, weighting 2.8-3.2 kg; they were divided into 9 groups and 3 subgroups. An osteotomy was performed in the mid third of the right femur and this segment was exposed to hyperthermia at 15, 20 and 25 degrees centigrade for 50, 60 and 70 minutes. A bone scan was performed every 4 weeks and X-rays were taken every week up to week 13. The post-hoc Tukey test was used for the statistical analysis. Differences were found in the concentration of chemicals at temperatures above 60 degrees for 20 minutes with statistical significance; bone healing was delayed and there was evidence of metabolic activity. We conclude that exposure to temperatures above 60 degrees for 20 minutes resulted in morphologic alterations in potassium, magnesium, sulfur and phosphorus, and delayed bone healing. These results are used as parameters for the treatment of bone tumors with fluid hyperthermia. [ABSTRACT FROM AUTHOR]

Introduction: Conservative surgery and reconstruction with an unconventional prosthesis are indicated for tumors of the humerus without neurovascular compromise, as they help preserve shoulder, elbow and hand function. The humerus is the third most frequent site of benign, aggressive, malignant and metastatic tumors that cause functional limitation or limb loss. Material: Patients with a bone tumor of the humerus without neurovascular involvement that met the inclusion criteria. Unconventional, uncemented, RIMAG prosthesis with diaphyseal fit and locking bolts. Methods: 39 patients with intraarticular type I tumors according to the Malawer and Enneking classification were treated with tumor resection and reconstruction with an unconventional prosthesis and soft sarcomas (2), chondroblastoma (2) and aneurysmatic bone cyst (1). Twelve patients died due to systemic disease and the remaining patients survived. Surgical margins were broad, with humeral resection between 100 and 230 mm. Functional results were assessed according to the Mus-coloskeletal Tumor Society score as 13 excellent, 16 good, 5 failures and 5 poor. Discussion: The resection level does not restrict the placement of this prosthesis, which permits future revisions. An appropriate result depends on the resection size and the preserved shoulder musculature and it is not limited by the size of resection, thus improving patients' disability. [ABSTRACT FROM AUTHOR]

Objective: To assess the functional efficacy of the RIMAG unconventional hip prosthesis in cancer and non-cancer patients. Material and methods: Functional analysis of 38 patients with RIMAG arthroplasty, using the Musculoskeletal Tumor Society Scoring System and including the following: functionality versus histologic diagnosis (5 malignancies, 3 metastases, 14 giant cell tumors (GCT), 8 with other benign tumors, and 8 had no tumor), age (40.4 ± 19.1 years), sex (24 females, 14 males), postoperative follow-up (34.7 ± 31.3 months). Analysis of intraoperative, immediate and late complications, time to weight bearing, gait and work or social reintegration were also assessed. Results. Global mean of ideal functionality was 65.6 ± 23.2%. Age was negatively correlated with the functionality rate (r = -0.507, p = 0.001); significant difference with the histologic diagnosis: malignant tumors 54.8, metastasis 58.6, giant cell tumor 25.6, other benign tumors 34.2, non-tumor causes 56.6 (p = 0.001). When functionality means were adjusted for age with a covariance analysis, better percentages were found for benign tumors (79.2 ± 6.8%) and giant cell tumors (76.4 ± 6.3%), less functionality for non-tumor causes (45.7 ± 7.6%), and intermediate percentages for malig- nant tumors and metastasis (p = 0.03). Intraoperative complications occurred in 4 cases (28.6%), immediate in 3 (7.8%), late in 15 (39.4%); 62.5% of patients started immediate weight bearing, 92.1% resumed their usual activities after surgery. Conclusions: The reconstruction of the proximal femur with RIMAG is a safe and reliable treatment option, with complication rates below the ones reported in the literature. Satisfactory results were obtained, with high functional rates for benign tumors, and low rates in older patients, malignant tumors and metastasis. [ABSTRACT FROM AUTHOR]

Giant cell tumor (GCT) is an aggressive benign neoplasia that accounts for 5% of primary bone tumors and 20% of all benign bone tumors. It appears almost exclusively after skeletal maturation, between 20 and 40 years of age, and is predominant among females. We report the case of a 39 year-old male patient who in 1988 sustained a left hip fracture in a pathological area. On July 20, 1988 he underwent excisional biopsy and curettage; on January 13, 1989 broad resection and arthrodesis of the left hip were performed with a cobra plate. The histopathologic diagnosis was GCT. On October 2, 1990 the cobra plate was removed due to fatigue. The patient was referred to our service with a fl oating hip joint and left knee anchylosis. On February 11, 1991 he underwent unconventional hip arthroplasty with a long stem up to the femoral supracondylar area. On February 2, 1995 the implant was removed due to fatigue. On February 16, 1995 an unconventional prosthesis with a long stem was reimplanted for knee arthrodesis. Final shortening was 10 cm. On November 17, 2010 he had radiographic signs of acetabular loosening and fatigue of the arthrodesis stem. On March 17, 2011 the unconventional prosthesis was removed, en-bloc resection of the distal femur was performed, and acetabular and femoral components were put in place. He is currently painless, walks with crutches and has 5.5 cm of shortening. The proximal femur is an infrequent site for GCT. Controlling the neoplasia and limb preservation are the major challenges that orthopedic surgeons and patients face. There are only a few published papers on revision of unconventional arthroplasty. There are no cases published on unconventional hip arthroplasty with ipsilateral knee arthrodesis. [ABSTRACT FROM AUTHOR]

Introduction: Chondrosarcoma is a malignant tumor of chondroid matrix-producing cells; based on its frequency, it is the second most common malignant bone tumor (10-20%) and responds poorly to chemo- and radiotherapy. It is infrequent in the pelvis. It has a rapid growth potential. The indicated treatment is broad resection with tumor-free margins. Pelvic reconstruction after resection is controversial. The current management of musculoskeletal neoplasias has a two-fold purpose. First of all, controlling the neoplasia by means of surgeries with cancer-free margins and, second, performing procedures for the reconstruction of the involved segment achieving limb preservation with maximum functionality. Objective: Intrapelvic reconstruction with the proximal third of the ipsilateral femur in a patient with a chondrosarcoma in Enneking-Dunham's zone II. And placement of an unconventional femur prosthesis. Clinical case: We present herein the case of a 58 year-old male, with a lytic lesion of the right acetabulum. The patient completed the diagnostic protocol, and the biopsy result was dedifferentiated chondrosarcoma. Conclusion: The purpose of the surgical technique is to use the proximal third of the femur as a novel reconstruction alternative with massive autograft for tumor lesions located in Enneking-Dunham zone II. [ABSTRACT FROM AUTHOR]

Surgical management of tumors located in the spine and the pelvis involves greater difficulty. Moreover, these tumors are usually very large and vascularized. Preoperative embolization of the internal iliac artery is a relatively safe procedure that may reduce the risk of bleeding and local recurrence in the case of benign tumors. Chondroblastoma is a tumor that is rarely located in the pelvis; its more frequent location is the triradiate cartilage. We describe a case of a chondroblastoma with a relapsing aneurysmal cystic component in the acetabulum of an adolescent patient. Treatment consisted of embolization of the internal iliac artery, fluid hyperthermia, hydrogen peroxide and bone marrow application. The patient was found to be asymptomatic at the 5-year postoperative follow-up. The technetium (99mTc) sestamibi scan was negative for tumor activity and found no lung metastases. [ABSTRACT FROM AUTHOR]

Introduction: This work presents clinical evolution and functional outcome of patients with histologic diagnosis of Muscle-aponeurotic aggressive fibromatosis in 10 years of follow up in the National Rehabilitation Institute. Material and methods: We performed a descriptive, retrospective, cross sectioned clinical trial in the Bone Tumour Department. We reviewed the clinical and radiological files from 1996 to 2006. Inclusion criteria: both genres, any age, clinical and histological diagnosis. Exclusion criteria: incomplete file, lost to follow up, other diagnosis. Elimination criteria: Death during trial period. Analyzed variables. Age, genre, occupation, birth place, school degree, anatomic situation, signs and symptoms, time of follow up, treatment, relapses. We used statistical computed system Excel 2007, with central trend descriptive variables. Results: Eleven patients (mean age 24.36; SD 18.32, 1-61 years), 9 female (81.8%) 2 male; birth place: Mexico City 7 (63.63%), Puebla 1, Toluca 1, South Baja California 1 and Chiapas 1. Anatomic situation: Pelvis 6 (54.54%), thoracic and gluteus 3. Pain and presence of a mass 10 (90.9%), range of motion limitation 5, edema and erithema 1. Relapses 6 (55%). Treatment: broad resection 3 patients, marginal resection 6 patients, radical resection 2 patients. Conclusions: If clinical suspicion of Muscle-aponeurotic fibromatosis appears, one should start protocol work up: laboratory, radiographic assessment, nuclear medicine, biopsy and histologic and immune-histochemistry. One should perform broad resections aiming to preserve the most possible extremity tissue disease free. [ABSTRACT FROM AUTHOR]

The need in resolving massive bone losses in hip region caused by tumors, infections, trauma or failed arthroplasties in 17 years of the Bone Tumors Department of the National Rehabilitation Institute, Mexico City, and data obtained from different studies: 1) Biomechanic study of an unconventional hip arthroplasty system, 2) Tridimensional model of a human femur by the finite element method, 3) Biomechanical analysis of a system bone-implant for reconstruction of the proximal third of the femur by the finite element method, 4) Incidence of tumor and pseudotumor bone and soft tissue lesions of the hip, generated the project of designing an unconventional interlocked hip arthroplasty system for femur reconstruction. Two processes were done for adequate manufacturing and dimensioning: Anthropomorphometric study of Mexican femora; 2) Design of an unconventional hip arthroplasty system with the following characteristics: first, the arthroplasty system is constituted by an intramedullar stem, is fixated to femur with interlocking screws, this fixation method was inspired from the design of intramedullar nails of Dr. Fernando Colchero Rosas. The system has a second fixation system in the femur cut region, resolved by a fenestrated support introduced in the cortical wall. Once data was processed, the need for manufacturing 2 models was determined: 1) One for the proximal 11 cm of the femur and 2) other for the 12 distal cm. The height of interlocking screws, 2 models of intracortical proximal support (one fixated and one fixable with an expansible screw), were designed. Diameter, length of the stems, size of spacers and supports were determined for adequate interlocking fixation. We designed the instruments for assembling, impaction and orientation of the arthroplasty system. The system was presented to the Mexican Institute of Industrial Property, at March 15, 1996 and the patent was conceded April 19, 2007 (#245717). [ABSTRACT FROM AUTHOR]

The purpose of this paper is to present the orthopedic-oncologic and functional outcomes of internal partial hemipelvectomy for a secondary giant pelvic chondrosarcoma in a patient with multiple hereditary osteochondromatosis. [ABSTRACT FROM AUTHOR]

Background: Disorders of the musculoskeletal system, whether due to congenital or acquired alterations of the body, have important repercussions in the work, economic, psychosocial and family setting of adult individuals. In developed countries, these conditions are considered as a public health problem together with the socioeconomic repercussions they entail. Objective: To determine the incidence of orthopedic disorders in adult patients seen from January 1st 2001 to December 31st 2005 at a private Hospital. Material and methods: We selected the male and female patients over 18 years of age who presented for their first visit with the orthopedic surgeon for an orthopedic non-traumatic condition. Results: A total of 18,780 patients were seen; 11,343 (60.4%) females and 7,437 (39.6%) males. The predominant orthopedic conditions were: low back problems in 53% of males and 47% of females, and gonarthrosis in 77% of females and 23% of males. Conclusion: The reported prevalence of orthopedic conditions ranges from 7.2% to 36.2%. Our study is consistent with such reports. Spine and knee conditions accounted for 13.4% and 12.7% among females, and 13.6% and 4.8% among males. [ABSTRACT FROM AUTHOR]

Design: Report of cases. Objective: Review of the cases in a period of 10 years with bone and soft tumors in foot and ankle, to knowing epidemilogical, clinic and patologic anatomy parameters to describe the behavior. Materials and methods: Review of 166 cases from 1991 to 2000 and been analyze with descriptive statistic, association measurment for inside stratum, with odds ratio, hipótesis test whith chi square for qualitative date and t to Student for quantitative date. Results:166 patients within 2 years to 78 years old, 81 with bone tumors and 79 with soft tumors, mostly benign, the most frequent was in the soft tissue ganglion and oseal benign exostosis in bone, 6 different malignant tumors, the principal affected zone were the toes, as a difference to literature, the most affected age group was 10 to 20 years followed to the 30 to 40 years old, we report 42 different patological diagnostics results to soft tissue and osseous tissue. Conclusion: clinical features is not a useful parameter to differentiate between malign or benign tumors and does not allow to establish the biological behavior, we propose the diagnostic algorithm that includes the intentional clinical probe, comparative X-ray in three projections with soft technique, in suspicion to malignant lesion may require CT scan, MRI, osseous scan and finally biopsy which will improve the final outcome. [ABSTRACT FROM AUTHOR]

Fibromatosis that involves locally aggressive lesions with a common histology may invade neurovascular structures. Surgical treatment depends on the location. Extensive dissection is the treatment of choice for small and anatomically accessible lesions. Radical surgery is indicated for recurrence, large tumors and tumors that involve neurovascular structures. Material and methods. Case report and literature review. The purpose of this paper is to show a surgical treatment modality emphasizing the reconstructive aspects of the foot of a patient with fibromatosis. Radical surgery was considered at the beginning because the imaging tests showed an apparently inoperable tumor. A conservative procedure was planned and performed; the four-year follow-up is reported. Results. Twenty-six year-old female patient who underwent conservative left foot surgery for aggressive musculoaponeurotic fibromatosis; she also had contralateral developmental hip dysplasia. The 4-year follow-up reported no tumor activity and appropriate gait. Conclusions. The imaging showed an apparently inoperable tumor. However, the careful surgical exploration performed in agreement with the oncologic criteria led to a conservative surgery with a tumor-free bed. Although the vascular supply of the foot may be compromised by the tumor, the foot may develop collateral blood flow that may allow conservative surgery with the integration of the bone graft. Reconstruction of the midfoot with an autologous graft is possible and results in an anatomical foot that biomechanically permits ambulation. [ABSTRACT FROM AUTHOR]

Eighteen cases of type B neck femoral fractures are reported here according to the OA classification. These fractures were treated through close reduction in fracture table and fixed by a hip dynamic system using cannular screws. This is a retrospective, observational, transversal, and comparative study, counting on "chi" square statistical analysis with the purpose of comparing fixing systems. This study was carried out at the Articular Replacement Service (Servicio de Reemplazos Articulares) of the "Lomas Verdes" Hospital of Traumatology and Orthopedics, belonging to the IMSS (National Health Care Institution). This study was performed on a group of people ranging between 18 and 45 years old, from both sexs, with an average age of 23 years old, without a predominating sex inside the group. The average surgical time for the cannular screws was of 75 minutes and in the hip dynamic system it was of 90 minutes. The X-ray consolidation in cannular screws was obtained after sixteen weeks. In four cases late complications were present; this corresponds to the 40% of the patients treated through dynamic hip screws which presented avascular necrosis. This last development was attributed to the fracture stroke instability to the vascular lesion of the head at the moment of the traumatism occurrence. No complications were found in patients treated by cannular screws. [ABSTRACT FROM AUTHOR]

Background. Infection after a primary total hip arthroplasty is a complication reported widely from 1 to 4.5% of patients during the first year after surgery. The etiologic agent most frequently isolated is Staphylococcus aureus. Aim. To determine percentage of patients infected and the etiologic agent after a primary total hip arthroplasty. Design. A retrospective longitudinal, descriptive, cause-effect and observational study. Setting. Hospital de Traumatología y Ortopedia "Lomas Verdes" del Instituto Mexicano del Seguro Social, Naucalpan de Juárez Estado de México. Material and methods. We reviewed 226 clinical files of patients who underwent a primary total hip arthroplasty in the period between January 1 of 1999 and December 31 of 2000. We recollected data from specially designed sheet, and were statistically analyzed with a central tendency measures using STATS system. We calculated the relative risk of infection to the relative variables through a tetracoric graph. Results. We found 19 patients (8.4%) infected after a primary total hip arthroplasty from a total of 226 patients and the causal agent were S. aureus in 12 of them (63.15%). Discussion. Infection after a primary total hip arthroplasty in strongly associated with patient owned factors and with the state of the mineral resources implicated with the procedure. Conclusions. There is a high risk of infection after a primary total hip arthroplasty in the Hospital de Traumatología y Ortopedia "Lomas Verdes" compared with previous reports in other places. Such complication can be diminished trough measures directed to improve the general conditions of the patients and the state of the material resources. [ABSTRACT FROM AUTHOR]

Introduction. The total hip arthroplasty, is a surgical procedure that is useful to relieve pain, to improve movement in patients with coxarthrosis, and to resolve 31B and 31C (AO/ASIF) fractures. The infection in this patients it's a fulminant complication. The treatment in the THR (total hip replacement) infection goes from local/systemic antibiotic therapy, wound irrigation, deep irrigation, antibiotic loaded chains of cement, one or two stage exchange with antibiotic impregnated cement, thru Girdlestone arthroplasty. Methods. 20 patients expedients were analyzed, who was performed primary THR Surgery that went thru infection, and received a surgical treatment at one stage exchange with vancomycin impregnated cement, 3 patients couldn't be able to get the files, and 1 discharged from de Hospital by himself. A close statistically relation exist comparing the one stage arthroplasty with the date of the last out-patient service visit, and the infection eradication. With 0.683 and P > 0.07. Conclusions. The one stage surgery with vancomycin impregnated cement it's an effective procedure to eradicate the infection in 14 patients (70%) of the 20 patients studied with deep infection after primary TH. [ABSTRACT FROM AUTHOR]

Objective. Treatment for pateilar chondromalacia by high frequency current, which is the purpose of the present paper, is compared to debridement of the patella and scissor lateral retinaculum release, either open or by arthroscopy, which has been the traditional treatment. Material and methods. From August 1999 through June 2001, a series of 30 adult patients, with an average age of 34.5 years (19 to 45), 24 female and 6 male, who had grade II-III bilateral patellar chondromalacia, were included for the present study. Those who had ligament instability, meniscal tears or other injuries that required an extra surgical procedure, were excluded from trial. Comparison was made in all patients between their right knee which was treated in the first term by mechanical shaving, and the left knee, which was treated in the second term by high frequency current, by arthroscopy in all cases. Patients were discharged from hospital in the same day as our department is for outpatient care. Results. No transoperative complications were produced in any case. In the postoperative period, a whole of 5 patients had a severe articular effusion and synovial inflammation; 2 in the right knee (mechanical procedure) and 3 in the left knee (radio-frequency procedure), demonstrating bacterial infection, which required additional surgery. Final result was satisfactory. Conclusion. Postoperative infection was produced by the higher frequency of this complication when surgery is performed in the second term as well as by an eventually greater carbonization than the average, rather than by the procedure itself. [ABSTRACT FROM AUTHOR]

Forty-five patients presenting neither patellar-femoral affection records nor X-ray or arthroscopic evidence of the disease were studied by determining through arthroscopy the contact of patella lateral facet, vertex and medial facet with the femur (thighbone) while the femoral-tibial joint was flexed. We found a standard mean of 33.4° for the lateral facet, with a standard deviation of 10.2°; 42.5° for the vertex, with a standard deviation of 10.8°, and 43.1° of femoral-tibial flexion for de medial facet, with a standard deviation of 11.3°. We observed some differences with respect to sex because there is a more precocious patellar-femoral contact in women than in men, agreeing with our previous researches and obtaining a framework for the normal patellar-femoral slip in our population. [ABSTRACT FROM AUTHOR]

Objectives: Arthroscopic repair of Bankart lesion has become the treatment of choice of anterior shoulder instability. Our objective is to analyze the medium-term results of arthroscopic Bankart repair. Material and methods: Between January 1999 and November 2007, 86 shoulders of 85 patients with diagnosis of relapsing shoulder dislocation were treated arthroscopically. After a mean 62-month follow-up (minimum 24 months) the results obtained were retrospectively assessed according the Rowe and Constant functional scales. A statistical analysis was done of the relation between functional results and age, sex, the side operated, capsulorrhaphy, rehabilitation and postoperative immobilization in our series. Moreover, the validity of MRI for diagnosing Bankart lesion was assessed. Results: Eighty-five percent of patients had good or excellent results according to the Rowe scale. The mean Constant scale score was 90.6. The re-dislocation rate in our series was 9%. The statistical analysis showed that female sex and immobilization time were related with worse results according to the Constant scale. Conclusions: In our hands, arthroscopic Bankart repair provides results similar to those in other published series. MRI is a useful diagnostic test in our setting, albeit its important implications for the diagnosis of Bankart lesion. Female sex and prolonged immobilization were related with worse functional results. [ABSTRACT FROM AUTHOR]

Introduction: Pediatric age is the group mainly affected by bone tumors. The objectives of this work were: 1) To determine which are the bone tumors and pseudotumoral lesions more frequent in the group of age from 0 to 14 years; 2) To determine if there are differences in the frequency of the tumors and pseudotumoral lesions between different subgroups and 3) To determine if there is any difference in the frequency of the different tumors according to gender. Methods: We conducted a cross-sectional study based on the Pathology files of the National Institute of Rehabilitation. Inclusion criteria were: all cases between January 2000 and December 2006 diagnosed by hystopathological means as bone tumor or pseudotumoral lesion, with an age of presentation between 0 to 14 years were included. Results: Frequency of bone tumors and pseudotumoral lesions in this series were: osteocondroma (44%), osteosarcoma (15.2%), fibrous dysplasia (10.4%) and encondroma (8.8%). We observed differences in the bone tumors or pseudotumor-like lesions frequency between the 3 subgroups of age studied. [ABSTRACT FROM AUTHOR]

Background: Charcot neuroarthropathy (CNA), commonly known as Charcot foot, is one of the most debilitating complications of diabetes mellitus. Patients with plantar ulcer and osteomyelitis (OM) due to Charcot foot represent a high cost for health systems and society in general. The amputation risk for ulcerated Charcot patients is 12 times higher than general population under 65 years old. Material and methods: In this article we present the CNA treatment protocol we use in our center. We also make a detailed description of the surgical technique «single stage surgery» with circular external fixation. Results: Our CNA treatment protocol covers the most common presentations of this severe neuropathic complication. With the «single stage surgery» using circular external fi xation we achieve an ulcer-free foot, successful treatment of the OM, correction of the deformity, diminished the cost of treatment, avoided amputation and prevented recurrence of the ulcer. Conclusions: The use of a treatment algorithm based on the current literature, can be an invaluable tool in the treatment of these complex patients. The circular external fi xation has proven to be the only reliable tool for treating complex Charcot foot in the context of poor bone stock, active ulcers, soft tissues problems and OM. [ABSTRACT FROM AUTHOR]

The frequency of giant cell tumors reported in the literature is very variable. Considering that our population has its own features, which distinguish it from the Anglo-Saxon and Asian populations, we think that both the frequency and the clinical characteristics of giant cell tumors in our population are different. The major aim of this paper was to determine the frequency and clinicopathological characteristics of giant cell tumors of the bone. A crosssectional descriptive study was conducted of the cases diagnosed at our service as giant cell tumors of the bone from January to December 2013. The electronic clinical records, radiologic records and histologic slides from each case were reviewed. Giant cell tumors represented 17% of total bone tumors and 28% of benign tumors. Patients included 13 females and 18 males. The most frequent locations of giant cell tumors were: the proximal tibia, 9 cases (29%), and the distal femur, 6 cases (19%). Forty-five percent of giant cell tumors were associated with aneurysmal bone cyst (ABC) (14 cases) and one case (3%) was malignant. The frequency of giant cell tumors in this case series was intermediate, that is, higher than the one reported in Anglo-Saxon countries (usually low), but without reaching the frequency rates reported in Asian countries (high). [ABSTRACT FROM AUTHOR]

Purpose: The purpose of this study is to analyze if there is any difference between the arthroscopic reparation of full-thickness supraspinatus tears with simple row technique versus suture bridge technique. Material and methods: We accomplished a retrospective study of 123 patients with full-thickness supraspinatus tears between January 2009 and January 2013 in our hospital. There were 60 simple row reparations, and 63 suture bridge ones. Results: The mean age in the simple row group was 62.9, and in the suture bridge group was 63.3 years old. There were more women than men in both groups (67%). All patients were studied using the Constant test. The mean Constant test in the suture bridge group was 76.7, and in the simple row group was 72.4. We have also accomplished a statistical analysis of each Constant item. Strength was higher in the suture bridge group, with a significant statistical difference (p < 0.04). The range of movement was also greater in the suture bridge group, but was not statistically significant. Conclusions: Suture bridge technique has better clinical results than single row reparations, but the difference is not statistically significant (p = 0.298). [ABSTRACT FROM AUTHOR]

Objective: We reviewed the first cases that underwent arthroscopic surgery at our center due to relapsing glenohumeral stability of the shoulder. The objective of this paper is to analyze the influence of the learning curve on the results obtained. Material and methods: We analyzed 137 patients who underwent surgery at Hospital 12 de Octubre in Madrid, Spain between February 1999 and March 2010. A total of 101 patients met the inclusion criteria, and these patients were divided into two groups using a chronological order, the first 50 patients and the second 50 patients. There were no statistically significant differences in sex, age and laterality between both groups (p = 0.51, p = 0.15 and p = 0.23, respectively), so the groups were comparable. We compared the following between both groups: clinical outcomes, number of dislocations, reoperations and complications, i.e., implant migration, arthrosis and axillary nerve neuropathy. We also compared the functional results, which were measured using the Constant and Rowe scales. Results: Four episodes of redislocation occurred in group 1 and 6 in group 2. Three reoperations were performed in group 1 and 6 in group 2. No statistically significant differences were found in the number of redislocations and reoperations (p = 50 and p = 0.48, respectively). [ABSTRACT FROM AUTHOR]