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Non-traumatic dislocation (Cam Jump) in a revision knee: a case report
Buchi Rajendra Babu Arumilli1, Bernard Ferns, Martin Smith
1Department of Trauma & Orthopaedics, Tameside General Hospital Fountain street, Ashton-Under-Lyne, OL6 9RW United Kingdom. rajjuorth@gmail.com
Cases Journal
|October 16, 2009
Summary
Posterior dislocation after revision knee replacement can occur without trauma due to flexion instability. This case highlights the challenges of managing dislocations in revision total knee arthroplasty.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Arthroplasty Research
Background:
- Dislocation following total knee arthroplasty (TKA) presents significant clinical challenges.
- Revision TKA further complicates management, with dislocation being a particularly difficult complication.
Observation:
- An 82-year-old male experienced a posterior dislocation (Cam Jump) of a posterior stabilized revision TKA.
- The dislocation occurred spontaneously, without any history of trauma.
Findings:
- Flexion space instability coupled with extensor mechanism insufficiency is presumed to be the primary cause of the atraumatic dislocation.
- The study explores the potential for diminished collateral stability at extreme flexion ranges post-knee replacement.
Implications:
- This case underscores the importance of assessing and managing flexion space stability in revision TKA.
- Understanding the biomechanics of instability in revision TKA is crucial for preventing adverse outcomes like dislocation.
