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Effect of knee replacement on flexion deformity.

M Tew, I W Forster

    The Journal of Bone and Joint Surgery. British Volume
    |May 1, 1987
    PubMed
    Summary

    Knee replacement surgery effectively corrects flexion deformities caused by arthritis, significantly reducing the need for revision surgery. This improvement is particularly notable in rheumatoid arthritis patients, even those with severe pre-operative deformities.

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    Area of Science:

    • Orthopedic Surgery
    • Rheumatology
    • Biomedical Engineering

    Background:

    • Flexion deformity is a common complication of rheumatoid arthritis and osteoarthritis.
    • Knee replacement aims to restore function and correct deformities.

    Purpose of the Study:

    • To evaluate the effectiveness of knee replacement in correcting flexion deformities.
    • To compare outcomes between primary and revision surgeries.
    • To assess the impact of pre-operative deformity severity on outcomes.

    Main Methods:

    • Retrospective review of 697 primary and revision knee replacements.
    • Follow-up duration of 1 to 16 years.
    • Analysis of flexion deformity rates before and after surgery.

    Main Results:

    • Pre-operative flexion deformity was present in 61% of knees, reduced to 17% post-primary replacement.
    • Revision surgery reduced deformity from 21% to 8%.
    • Rheumatoid arthritis knees were more affected but showed better correction success.
    • Walldius hinge and Freeman condylar prostheses were most effective.
    • Severe pre-operative deformity in rheumatoid knees correlated with better outcomes.

    Conclusions:

    • Knee replacement is highly effective in correcting flexion deformities, with sustained improvements.
    • Specific prostheses demonstrate superior correction capabilities.
    • Unexpected positive outcomes observed in severely deformed rheumatoid knees warrant further investigation.

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