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The spherocentric knee: a re-evaluation and modification

F R Convery, M Minteer-Convery, L L Malcom

    The Journal of Bone and Joint Surgery. American Volume
    |April 1, 1980
    PubMed
    Summary
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    This study evaluated the spherocentric total knee replacement, finding 70% of patients experienced pain relief. Modifications to the femoral component improved alignment, though long-term outcomes require further investigation.

    Area of Science:

    • Orthopedic Surgery
    • Biomedical Engineering

    Background:

    • Total knee replacement (TKR) is a common procedure for end-stage knee osteoarthritis.
    • The spherocentric component is a specific design used in TKR.
    • Initial component designs may require modification based on clinical outcomes.

    Purpose of the Study:

    • To prospectively evaluate the early results of total knee replacement using the standard spherocentric component.
    • To retrospectively identify the causes of unsatisfactory outcomes with the standard spherocentric component.
    • To inform modifications to the spherocentric femoral component based on initial findings.

    Main Methods:

    • Prospective assessment of 36 knees following standard spherocentric TKR.
    • Retrospective analysis of complications and unsatisfactory results.

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  • Follow-up ranged from 22 to 52 months (mean 35 months).
  • Post-study modification of the femoral component based on identified issues.

    • Main Results:

    • 70% of knees (25/36) showed significant pain relief and improved function.
    • 11 knees (30%) had unsatisfactory results due to loosening (5), supracondylar fracture (2), infection (1), or suspected loosening (3).
    • Complications predominantly occurred within the first postoperative year.
    • Coronal plane alignment was inconsistent, and hyperextension was noted in 12 knees.

    Conclusions:

    • The standard spherocentric TKR provided satisfactory outcomes in 70% of cases.
    • Component loosening and fracture were significant complications, often appearing early postoperatively.
    • A modified spherocentric femoral component was developed with improved alignment characteristics.
    • Further follow-up is needed to determine the long-term efficacy of the modified component regarding loosening and fracture rates.