Bore Disruption: An Unusual Mechanical Failure of Two Hip Hemiarthroplasties
نویسندگان
چکیده
We report a case of two hemiarthroplasties (HAs) that underwent an unexpected mechanical failure. Two patients affected by femoral fractures were treated with an HA. At 5 and 7 years after surgery, they showed a breakage of the HA at the head-stem junction. We analyzed macroscopically and microscopically (by a scanning electron microscopy) the surfaces of the broken prostheses. In both cases, a fracture was detected starting at the joining point between the femoral head and the slot that receives the taper cone of the stem (the so-called bore), with the typical macroscopic and microscopic pattern of a fatigue fracture. The fatigue fracture resulted from repeated cycles of torsional stresses throughout the years. In literature, we did not find any other report of such HA failure.
منابع مشابه
Author's response to reviews Title: Hemiarthroplasties in young patients with osteonecrosis or a tumour of the proximal femur; an observational cohort study Authors:
Background The failure scenario of total hip arthroplasty (THA) in younger patients (< 65 years) is dependent upon the fixation and wear of the acetabular component. In select cases, where endoprosthetic replacement of the femoral head is unavoidable for limb salvage or functional recovery, hemiarthroplasty is a viable alternative. The purpose of this study was to evaluate hemiarthroplasty as a...
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