PubMed · 9741249
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J Stürup, J A Retpen. 1998-08-17. [Complications when using bone cements].. https://pubmed.ncbi.nlm.nih.gov/9741249/
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A matched comparison was made between total hip arthroplasties done for osteonecrosis and those done for osteoarthritis. Patients were matched for age, sex, surgical approach, prosthesis, and surgeon. All received cemented Charnley replacements and had minimal follow-up of 10 years. There were 118 women and 70 men with a mean age of 58 years. Thirty-five patients were younger than 50. The mean follow-up was 17.8 years (range, 10 to 25.4 years). Revision rates for osteonecrosis and osteoarthritis were 18% and 19% (not significant). The mechanical failure rate (revision for loosening plus radiographic loosening) was greater, but not significantly so, in the osteonecrosis group. In patients younger than 50 years, the revision rate in osteonecrosis (50%) was significantly higher than that in any other group. Similarly, the mechanical failure rate in osteonecrosis was significantly greater in the patients younger than 50. Radiographic femoral loosening was greater in osteonecrosis at all follow-up intervals, and dislocations occurred more frequently in the osteonecrosis group than in the osteoarthritis group. Results of arthroplasty in both groups were comparable in patients over 50 years of age, although patients with osteonecrosis had an increased rate of dislocation. Patients with osteonecrosis who are younger than 50 years have a significantly higher rate of mechanical failure than those with osteoarthritis who are younger than 50 years. Cemented total hip arthroplasty should be recommended in this group with caution if at all.
This study was conducted to determine if bone and muscle loss is reversible in patients who had undergone total hip arthroplasty (THA) owing to necrosis of the femoral head after osteosynthesis for a displaced femoral neck fracture. The cortical bone mineral density (BMD), bone volume, bone mass, and muscle volume of the thigh and the BMD of the distal femur and proximal tibia were measured by quantitative computed tomography in 16 patients. Both extremities were measured just before reoperation. The measurements were repeated 3 and 6 months later. At reoperation, there was a mean 12% relative loss of bone mass and 23% loss of muscle volume in the middle femur on the fractured side compared with the uninjured side. In the distal femur and proximal tibia, there was a relative loss of BMD of 14% and 21% on the fractured side. Six months after reoperation, we found no change in bone mineral at any location on either side. The muscle of the thigh showed a gain in volume of 20% on the reoperated side but no change on the uninjured side. At the time of reoperation, we noted a marked bone and muscle loss on the fractured side. We failed to note any restoration of bone mineral after THA despite remobilization, which is expressed as an increase in muscle volume on the reoperated side. This study indicates that osteopenic bone has difficulties in adapting to patients' improved mobility after reoperation.
Cerclage wires have been used to stabilize proximal femoral cracks after stem insertion in cementless total hip arthroplasty. The objective of this study was to determine the optimal number and orientation of cerclage wires necessary to prevent stem subsidence and crack propagation. The crack was stabilized by 1, 2, or 3 wires placed either normal to the femoral neck axis or normal to the crack. The femora were compressed to 2,670 N while measuring crack opening and stem subsidence. Wires placed normal to the crack allowed less stem subsidence by 3.17 mm and less crack opening by 1.55 mm compared with wires placed normal to the neck. The addition of multiple wires reduced subsidence by 50% and reduced crack opening to <1 mm. Medial and anterior calcar cracks are best stabilized by at least 2 cerclage wires that are placed normal to the crack.