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Posterior dislocation after posterior stabilization TKA.

Yu-Ping Su1, Fang-Yao Chiu, Tain-Hsiung Chen

  • 1Orthopaedic Department, Taipei Veterans General Hospital, and National Yang-Ming University School of Medicine, Taipei, Taiwan, ROC. yu_ping_su@hotmail.com

Journal of the Chinese Medical Association : JCMA
|April 29, 2003
PubMed
Summary
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Posterior dislocation after total knee arthroplasty is rare but serious. Excessive soft tissue release and bone resection to achieve higher flexion can lead to instability and dislocation.

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering

Background:

  • Posterior dislocation is a rare but severe complication following primary total knee arthroplasty (TKA).
  • Achieving a satisfactory range of motion is a key goal in TKA, but can involve aggressive surgical techniques.

Observation:

  • An 85-year-old male patient experienced posterior dislocation of the right knee one month after bilateral TKA.
  • The dislocation recurred and was associated with infection, necessitating open reduction and debridement.

Findings:

  • The mechanism of dislocation involved the tibial spine escaping the femoral cam during slight flexion and external rotation.
  • This was attributed to flexion laxity and biceps tethering, likely resulting from excessive soft tissue release and bone resection for increased flexion.
  • Flexion instability was noted, increasing the risk of dislocation.

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Implications:

  • Surgical techniques aimed at achieving extreme flexion in TKA may compromise joint stability.
  • Careful consideration of soft tissue balance and bone resection is crucial to prevent flexion instability and posterior dislocation.
  • Further research into optimal surgical parameters for TKA is warranted to balance range of motion with stability.