Abstract
Six hundred seventy-three total hip replacements by Sivash (free material) resulted in 21 fractures of the implant stem (3,12%) in the period from 3 to 20 years after operation. Biomechanical study as well as the surgical findings allowed the author to assume that the probability of the stem fractur in the stable implant is higher than in unstable one. Metal and fractographic analysis the fractures are of the fatigue pattern. The promoting factors are the micropores in the structure of the metal and the facings during mechanical treatment of the implant. The surgical technique of prevision total hip replacement in case of the stem fracture is described.
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