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Related Experiment Videos

Anterior dislocation after total knee arthroplasty: a case report.

Yilihamu Tuoheti1, Wataru Watanabe, Eiji Itoi

  • 1Department of Orthopedic Surgery, Xinjiang Medical University, Urumqi, Xinjiang, Peoples Republic of China.

Journal of Orthopaedic Science : Official Journal of the Japanese Orthopaedic Association
|October 18, 2005
PubMed
Summary

An 11-year total knee arthroplasty dislocated anteriorly in a woman with rheumatoid arthritis and osteoporosis. Unique wear, ligament avulsions, and fracture led to dislocation without trauma or infection.

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science

Background:

  • Severe rheumatoid arthritis and osteoporosis are significant risk factors for orthopedic implant complications.
  • Total knee arthroplasty (TKA) is a common procedure for end-stage knee arthritis.

Observation:

  • An 11-year TKA in a 52-year-old woman with severe rheumatoid arthritis and osteoporosis presented with anterior dislocation.
  • The dislocation occurred without apparent trauma or infection.

Findings:

  • Massive wear of ultra-high-molecular-weight polyethylene (UHMWPE) was observed.
  • Avulsion injuries of the medial collateral ligament and patellar tendon were present.
  • A stress fracture of the fibula, secondary to increased posterior tilt angle, contributed to the dislocation.

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Implications:

  • This case highlights a rare complication of TKA, emphasizing the potential for complex failure mechanisms.
  • Understanding these unique mechanisms is crucial for improving TKA design and patient selection.
  • Further research into UHMWPE wear and ligamentous integrity in osteoporotic patients undergoing TKA is warranted.