Does tibial rotation correlate with femoral anteversion? Implications for hip arthroplasty.

The aim of the study was to assess the magnitude and variability of rotation of ipsilateral femur and tibia and to identify the existence of rotational correlations. Femoral rotation (FR) and tibial rotation (TR) were measured with computed tomography in 151 consecutive patients when total hip arthroplasty was planned. Median FR was 14 degrees (range, -23 degrees to 91 degrees ) and median TR was 38 degrees (range, 15 degrees -76 degrees ).

Alendronate prevents femoral periprosthetic bone loss following total hip arthroplasty: prospective randomized double-blind study.

Following total hip arthroplasty (THA), femoral periprosthetic bone undergoes a remodeling process that results in bone loss in its proximal regions that may compromise the long-term outcome of THA. Periprosthetic bone loss mainly occurs during the first postoperative months. The question is whether a postoperative treatment with alendronate is effective in reducing periprosthetic bone loss and which doses and duration of treatment are required.

Changes of the biochemical markers of bone turnover and periprosthetic bone remodeling after cemented hip arthroplasty.

Do periprosthetic bone loss and postoperative levels of the biochemical markers of bone turnover correlate? The femoral bone mineral density of 53 patients was measured by dual-energy x-ray absorptiometry 1 week and 2, 4, 6, and 12 months after cemented total hip arthroplasty (THA). Biochemical markers of bone turnover were assayed preoperatively and 3, 8, 16, and 24 weeks post-THA. Greatest bone loss was detected in the calcar region (region of interest 7), on average, 16% after 1 year.

How does soft tissue distribution affect anteversion accuracy of the palpation procedure in image-free acetabular cup navigation? An ultrasonographic assessment.

Navigation of the acetabular cup in total hip replacement (THR) is used to improve the reproducibility of acetabular component positioning. When the palpation of anatomic landmarks, which is necessary to determine the pelvic coordinate system, is performed epicutaneously, the question as to how uneven soft tissue distribution can influence navigation accuracy arises. To obtain data, the questionable soft tissue thickness was measured in 72 patients scheduled for THR.

Bone strength influences periprosthetic bone loss after hip arthroplasty.

Unlabelled: Our primary question was whether bone strength at the time of surgery, reflected by the lumbar spine T-score and femoral cortical thickness, influences periprosthetic bone loss after a total hip arthroplasty. Using dual energy xray absorptiometry we preoperatively and postoperatively examined 38 consecutive patients having cementless total hip arthroplasties for their bone density. Bone strength was estimated using lumbar spine bone mineral density and the ipsilateral diaphyseal cortical thickness of the femur measured on radiographs.

Prosthetic replacement in secondary Girdlestone arthroplasty has an unpredictable outcome.

The functional outcome of hip replacement following a Girdlestone arthroplasty may be difficult to predict. We reviewed 39 hips in 39 patients with a minimum follow-up of 12 (range 12-208) months from re-implantation total hip arthroplasty. The patients were treated in one institution between 1983 and 2000, and their mean age at conversion was 65 (32-85) years.

Components of laxity in interference fit fixation of quadrupled hamstring grafts.

We tested in vitro 15 Poly-L-lactic acid and 14 titanium interference screws in male human cadaver tibia-hamstring constructs. Elongation of the graft, displacement of the screw in the tibial tunnel, and slippage at the graft/screw interface were measured as outcomes with an infrared optical system. All constructs failed by slippage of the graft past the interference screw.

The effect of strand configuration on the tensile properties of quadrupled tendon grafts.

Purpose: To compare selected biomechanical properties of 4 different quadrupled tendon graft preparations applicable for anterior cruciate ligament reconstruction.

Type Of Study: Biomechanical investigation in a cadaver model.

Methods: Graft strands were arranged in parallel, braided, bolo-plait, and twist configurations.