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An analysis of 14 fractures of the stem of the early design of low friction arthroplasty showed a predominance of heavy, bilaterally operated males. The total incidence was 0.67 per cent. The fractures occurred between 14 months and 5 years postoperatively. Every fracture was preceded by radiological signs of loosening caused by varus positioning of the femoral head prosthesis and defective cement support medially at the femoral calcar.
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Carlsson et al. (1977) studied this question.
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