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Related Experiment Videos

Resurfacing arthroplasty. Femoral head viability.

G W Bradley, M A Freeman, P A Revell

    Clinical Orthopaedics and Related Research
    |July 1, 1987
    PubMed
    Summary

    Femoral head resurfacing rarely causes bone death, contrary to concerns about implant loosening. Histologic analysis of failed hip resurfacing showed viable bone in most cases, indicating bone death is not an inevitable outcome.

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    Area of Science:

    • Orthopedic Surgery
    • Biomaterials Science
    • Histopathology

    Background:

    • Hip resurfacing arthroplasty offers theoretical advantages but faces controversy due to high failure and loosening rates.
    • Osteonecrosis (bone death) is a suspected factor in hip resurfacing failures.

    Purpose of the Study:

    • To investigate the role of osteonecrosis in failed hip resurfacing procedures.
    • To assess bone viability within the femoral head after resurfacing.

    Main Methods:

    • Histologic examination of bone retrieved from 25 failed femoral resurfacing components.
    • Evaluation of bone tissue for signs of necrosis or viability.

    Main Results:

    • Bone was substantially alive in 23 out of 25 cases (92%).
    • Two cases exhibited dead bone within the femoral head.
    • These two cases of bone death were associated with femoral neck fracture.

    Conclusions:

    • Bone death is not an inevitable consequence of hip resurfacing arthroplasty.
    • The use of polymethylmethacrylate fixation does not invariably lead to osteonecrosis.
    • Findings suggest factors other than widespread osteonecrosis contribute to hip resurfacing failures.

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