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UCI total knee replacement. A follow-up study

L R Hamilton

    The Journal of Bone and Joint Surgery. American Volume
    |June 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    The UCI total knee prosthesis showed a high failure rate, with 27% of knees requiring further surgery due to instability and component loosening. Deformity recurrence suggests underlying biomechanical issues contributed to these total knee arthroplasty failures.

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    Area of Science:

    • Orthopedic Surgery
    • Biomedical Engineering
    • Reconstructive Surgery

    Background:

    • The UCI (University of California at Irvine) total knee prosthesis was utilized for arthroplasty between 1972 and 1977.
    • Early designs of total knee prostheses faced challenges in long-term patient outcomes.

    Purpose of the Study:

    • To evaluate the long-term efficacy and failure modes of the UCI total knee prosthesis.
    • To identify factors contributing to the failure of total knee arthroplasty using this specific implant.

    Main Methods:

    • Follow-up examination of 80 patients (100 knees) who received the UCI total knee prosthesis.
    • Analysis of failure reasons, including instability, dislocation, and component loosening, in relation to preoperative deformity.

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    Main Results:

    • Twenty-seven percent (27 knees) of the examined cases were designated as failures, necessitating further surgical intervention.
    • Failures in valgus knees were linked to early medical instability and patellar dislocation; varus knees failed later due to tibial component loosening.
    • Post-failure analysis revealed a reversion to preoperative angular deformity, suggesting persistent biomechanical stress and potential ligament imbalance.

    Conclusions:

    • The original UCI prosthesis tibial components lacked adequate surface area and stiffness, leading to loosening and subsidence.
    • Insufficient constraint between components contributed to subluxation and dislocation, particularly after soft-tissue release.
    • These findings led to the discontinuation of the UCI total knee arthroplasty at Ochsner Medical Institutions.