J Bone Joint Surg Br
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J Bone Joint Surg Br · Jul 2001
Comparative StudyA comparison of polyethylene wear in hips with cobalt-chrome or zirconia heads. A prospective, randomised study.
We have reviewed 70 patients with bilateral simultaneous total hip arthroplasties to determine the rate of failure and to compare polyethylene wear and osteolysis between an implant with a cobalt-chrome head and Hylamer liner with that of a zirconia head and Hylamer liner. The mean thickness of the polyethylene liner was 11.0 mm (8.8 to 12.2) in the hip with a zirconia head and 10.7 mm (8.8 to 12.2) in that with a cobalt-chrome head. At follow-up at 6.4 years no acetabular or femoral component had been revised for aseptic loosening and no acetabular or femoral component was loose according to radiological criteria in both the cemented and cementless groups. ⋯ Of 12 hips with acetabular osteolysis, six had a 28 mm cobalt-chrome femoral head and the remaining six a 28 mm zirconia head. Osteolysis was observed in zones 1A and 7A of the femur in two hips (3%) with a 28 mm zirconia head (cemented hip) and in four (6%) with a 28 mm cobalt-chrome femoral head (cementless hip). Our findings suggest that although the performance of a zirconia femoral head with a Hylamer liner was not statistically different from that of a cobalt-chrome femoral head and Hylamer liner, there was a trend for the zirconia head to be worse than the cobalt-chrome femoral head.
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J Bone Joint Surg Br · Jul 2001
Timing of the administration of tranexamic acid for maximum reduction in blood loss in arthroplasty of the knee.
We studied 99 patients who were undergoing total knee arthroplasty (TKA) to determine the optimum protocol for the administration of tranexamic acid (TNA) in order to reduce blood loss. It decreased by more than 40% after the administration of TNA. ⋯ There was no increase in the incidence of adverse affects in the patients receiving TNA, compared with a control group. We conclude that two injections of TNA, one given preoperatively and one on deflation of the tourniquet, significantly reduce blood loss without increasing the risk of thromboembolic complications.
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J Bone Joint Surg Br · Jul 2001
Ilizarov external fixation for severely comminuted supracondylar and intercondylar fractures of the distal femur.
Our aim was to determine the clinical effectiveness and safety of Ilizarov external fixation for the acute treatment of severely comminuted extra-articular and intercondylar fractures of the distal femur. A total of 14 consecutive patients with complex fractures was treated. There were three type-A3, two type-C2 and nine type-C3 fractures according to the AO/ASIF system. ⋯ One patient with a type-IIIA open fracture had infection and nonunion. The mean range of flexion of the knee at the final follow-up was 105 degrees (35 to 130). We conclude that, in the treatment of comminuted fractures of the distal femur, the Ilizarov fixator is safe and effective in providing stability and allowing early rehabilitation.