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Related Experiment Videos

Polyethylene exchange only for prosthetic knee instability.

D Hodari Brooks1, Thomas K Fehring, William L Griffin

  • 1Charlotte Orthopedic Specialists, Charlotte, NC 28207, USA.

Clinical Orthopaedics and Related Research
|December 4, 2002
PubMed
Summary
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Polyethylene exchange can effectively treat prosthetic knee instability with low morbidity. However, a significant failure rate indicates that alternative stabilization methods should be considered when instability is a concern.

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering

Background:

  • Tibiofemoral instability is a complication following total knee arthroplasty.
  • Revision total knee arthroplasty (TKA) is often required to address instability.
  • Polyethylene exchange is a potential surgical option for managing TKA instability.

Purpose of the Study:

  • To evaluate the efficacy and outcomes of polyethylene exchange in revision TKAs for tibiofemoral instability.
  • To assess the clinical results and failure rates associated with this specific surgical intervention.

Main Methods:

  • Retrospective review of 47 revision TKAs performed between 1987 and 1996 for tibiofemoral instability.
  • Analysis of 16 patients who underwent polyethylene exchange as the sole intervention for instability.
  • Follow-up assessment of 14 patients with a mean follow-up of 56 months, including clinical scores and stability assessment.

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Main Results:

  • The mean Hospital for Special Surgery (HSS) Knee Score improved from 50 preoperatively to 73 postoperatively.
  • Seventy-one percent (10 of 14) of patients achieved clinically stable knees.
  • A failure rate of 29% (four of 14) was observed, indicating potential limitations of the procedure.

Conclusions:

  • Polyethylene exchange can be an effective, low-morbidity procedure for specific cases of prosthetic knee instability.
  • The 29% failure rate necessitates careful consideration and suggests exploring alternative stabilization techniques when construct stability is uncertain.