Purpose: We evaluated, retrospectively, twenty hips that had undergone revision surgeries because of massive pelvic osteolysis in order to determine the retention rate of acetabular metal shells and polyethylene liner exchanges.. Materials and Methods: We performed liner exchanges for massive osteolysis around stable HG acetabular cups with severe polyethylene wear in twenty-three hips, between June 1996 and May 2003. Clinical and radiological follow-up was available for 20 hips for more than 2 years. In 18 hips, we performed curettage of the granulomatous tissue and tightly packed morselized cancellous allografts into the screw holes or the peripheral rims for the acetabular osteolytic lesions. The mean follow-up period was 3.8 years (range, 2.4 to 9.3 years) and the mean of time from the primary total hip arthroplasties to the component exchanges, was 8.2 years (range, 5.6 to 12.4 years). Results: During the follow-up period, all of the hips were functioning well, and none required any subsequent repeat surgeries. Dislocations occurred three times after the repeat operations in one hip, which was treated successfully with an abduction brace. None of the hips demonstrated a progression of the pre-existing osteolytic lesions or the development of any new osteolytic lesions. At the final follow-up, none of the acetabular components demonstrated any evidence of loosening. Conclusion: Our results demonstrated that isolated liner exchanges and debridement of the granulomatous tissue, with or without bone grafting, can be an effective alternative solution to revision of the cup for massive osteolysis around well-fixed, cementless, acetabular cups in selected patients. Retention of the pre-existing cementless acetabular cup provides less intra-operative and post-operative morbidity. However, in order to determine the longevity of the retained cementless acetabular cups, further long-term studies are necessary.
Acetabulum* ; Allografts ; Arthroplasty ; Arthroplasty, Replacement, Hip ; Bone Transplantation ; Braces ; Curettage ; Debridement ; Dislocations ; Follow-Up Studies ; Hip ; Humans ; Longevity ; Osteolysis* ; Osteolysis, Essential ; Polyethylene ; Retrospective Studies ; Transplants*

Contemporary cementing techniques improved the longevity of the cemented total hip replacement. The mechanical strength of acrylic bone cement can be changed by different handling techniques with reduction of the porosity of acrylic bone cement. The greatest improvement of the mechanical properties with reducing the porosity is that of the fatigue strength. We investigated the mechanical properties of the specimens of high viscosity, Palacos R(Merk, Darmstadt, FRG) bone cement with two mixing methods, hand and vacuum mixing. Vacuum mixing improved the ultimate tensile strength by 22.4% compared to hand mixing in previous study. For the uniaxial tension fatigue test, the specimens were cyclically loaded at a maximum stress of 25 MPa at a frequency of 2.5 Hz and to investigate the porosity, scanning electromicroscopic examination was taken in each hand mixed and vacuum mixed specimens. Scanning electromicrogram showed the vacuum mixed specimens to be the more uniform and free of small voids compared with the hand mixed specimens. The results of the fatigue test were analized using Weibull distribution of survival probability, the average number of cycles to failure was 1459±924 cycles in hand mixed specimens, in vacuum mixed specimens, 21491±14956 cycles. The average fatigue life of the vacuum mixed specimens was 15 times loanger than that of the hand mixed specimens by Weibull mean, this differene exists stastically within 95% confidence interval. We could suggest vacuum mixing technique as a method eliminating porosity in a chilled acrylic bone cement and thereby markedly improving the mechanical properties. In cemented joint replacement surgery, a vacuum mixing technique are recommended as a method of preparation of acrylic bone cement
Arthroplasty, Replacement, Hip ; Clothing ; Fatigue ; Hand ; Joints ; Longevity ; Methods ; Polymethyl Methacrylate ; Porosity ; Tensile Strength ; Vacuum ; Viscosity

No abstract available.
Hemarthrosis* ; Knee*

No abstract available.
Decompression* ; Head* ; Osteonecrosis*

No abstract available.
Aged* ; Femur Neck* ; Femur* ; Humans

No abstract available.
Aged* ; Child* ; Dislocations* ; Hip* ; Humans

Acetabular fractures are relatively uncommon, but when they occur they often result in permanent disability due to management difficulties. Undisplaced acetabular fractures have a good prognosis but major displaced acetabular fractures have always given rise to difficulty and concern during treatment and have a variable prognosis in different reports. In order to restore excellant function to a displaced acetabular fracture, anatomic open reduction and secure internal fixation followed by early mobilization are neccessary. And in order to approach fracture of acetabulm safely and with maximum ease, it is neccessary to understand the pathologic anatomy. The authors studied the sex and age distribution, clssification according to roentgenographic findings, associated injuries and methods of treatment of 49 patients who were admitted to the department of orthopedic surgery of our hospital from January, 1976 to June, 1981 under the diagnosis of acetabular fracture. The results of treatment of 31 patients who were followedup over a 6month period were as follows: 1. The mean age was 37 years, the range being from 17 to 71. 2. The most common cause of injury was traffic accidents (38 cases: 77.6%) which was followed by falls from heights (5 cases;10.2%). 3. Thirty cases were treated by conservative mea ures and 19 by surgery. The results were as follows: Excllent-10(32.3%), Good-14 (45.2%), Fair-6(19.3%), Poor-1 (3.2%), 4. The one case that had a poor result was a “T” shaped fracture with a central dislocation, which was impossible to reduce surgically due to severe comminution. 5. If the grossly displaced fragments are present they should be reduced and fixed surgically. But only if anatomical reduction and secure internal fixation is possible, surgery should be done. With a severely comminuted fracture, medial wall fracture, or central fracture-dislocation, surgical treatment is difficult therefore conservative treatment is better. 6. It is of great help to have various methods of roentgenography, conventional tomography, and computed axial tomographic scan in order to understand the pathologic anatomy of complicated acetabular fractures. 7. If surgery is attempted, it is essential to achieve an anatomic reduction and firm fixation by fully understanding the pathologic anatomy and by choosing an appropriate approach and fixative device.
Accidental Falls ; Accidents, Traffic ; Acetabulum ; Age Distribution ; Clinical Study ; Diagnosis ; Dislocations ; Early Ambulation ; Fractures, Comminuted ; Humans ; Orthopedics ; Prognosis ; Radiography

From September 1983 to June 1988, the authors could experience 104 cases of meniscal injury from 99 patients by arthroscopic examination. The results of this study may be summarized as follows : 1. There were noticed 35 cases of medial meniscus tear, 35 cases of lateral discoid meniscus tear, 12 cases of intact lat discoid meniscus, 1 case of medial discoid meniscus and 3 cases of lateral meniscal cyst. 2. Most common type of meniscal tear was bucket handle type (35 cases, 34.6%). 3. Most common site of rupture was posterior horn of medial meniscus. 4. Post operative results appeared related with the type of meniscus rupture and combined pathology of knee jont. Bucket handle type rupture was of good prognosis and meniscus lesions with chondromalacia was of poor prognosis.
Animals ; Arthroscopy ; Cartilage Diseases ; Clinical Study ; Horns ; Humans ; Knee ; Menisci, Tibial ; Pathology ; Prognosis ; Rupture ; Tears

The purpose of this study is to access and describe the status of patients with untreated anterior cruciate ligament ruptures to determine if prediction of functional deterioration in these knees were inevitable. 29 patients with rupture of the anterior cruciate ligament verified arthroscopically were evaluated at an average of 3 years and 8 month after injury. This group of patients was selected by the retrospective review in patients who were treated with traumatic ligament injury of the knee joint. The average age at the injury time was 25.9 years ranged from 16 to 44 years and most of injuries occured during sports activities including 12 cases (4196) occured while the patients were playing football. Meniscal lesions were found in 21 cases(72.4%) of all 29 cases of which were 15 cases in the medial, 4 in the lateral and 2 in both side. Follow up functional average score using the Hospital for Special Surgery Knee was 35.8 which would be fall in the Fair range defined as moderate functional disability and depending on the condition of thigh muscle, the functional score was 38.3 in case of less than 2cm atropy of the thigh on the involved side and 32.6 in case of more than 2cm atrophy. There was statistically significant difference (p < 0.05) of the functional score. Reinjuries of the same knee joint were experienced in 22 cases (76%). Rehabilitation of thigh muscles would play an important part in recovery from the injuries.
Anterior Cruciate Ligament ; Atrophy ; Follow-Up Studies ; Football ; Humans ; Knee Joint ; Knee ; Ligaments ; Muscles ; Rehabilitation ; Retrospective Studies ; Rupture ; Sports ; Thigh

The 35 patients of femur neck fracture treated with bipolar hemiarthroplasty were followed up for an average of 18 months with the range of 12 months to 5 years after bipolar hemiarthroplasty from Jan. 1986 to Dec. 1992. 1. Mean age of the patient was 68 years old(25-93) and mean hospitalization period was 55 days. 2. Associated medical problems were diabetes mellitus in 6 cases, cerebrovascular disease in 5 cases, rectal cancer in 1 case and pulmonary tuberculosis in 1 case. 3. An anterior dislocation, one of the early complication occured in 1 case, and superficial infection in 3 cases(8.5%), a deep infection, one of the late complication occured in 1 case. 4. The clinical result was focus on the functional hip assessment of bipolar hemiarthroplasty after femur neck fracture, and the functional results evaluated by Lunceford's Method were excellent in 22 cases(63%), good in 5 cases(14.3%), fair in 5 cases(14.3%), poor in 3 cases(8.6%). 5. The bipolar hemiarthroplasty was satisfactory method for the displaced femur neck fracture in the elderly patients, but to return the patient's preinjury activity level, more active postoperative rehabilitation should be required.
Aged ; Cerebrovascular Disorders ; Diabetes Mellitus ; Dislocations ; Femoral Neck Fractures ; Femur Neck ; Femur ; Hemiarthroplasty ; Hip ; Hospitalization ; Humans ; Methods ; Rectal Neoplasms ; Rehabilitation ; Tuberculosis, Pulmonary