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Does the joint line matter in revision total knee replacement?
A J Porteous1, M A Hassaballa, J H Newman
1Bristol Knee Group, Avon Orthopaedic Centre Southmead Hospital, Southmead Road, Bristol BS10 5NB, UK. andrew.porteous@nbt.nhs.uk
Summary
Restoring the joint line during revision total knee replacement significantly improves patient outcomes and functional scores. Achieving this restoration is crucial for better long-term results after knee surgery.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Reconstructive Surgery
Background:
- Revision total knee replacement (TKR) aims to restore function and alleviate pain in patients with failed primary knee implants.
- Maintaining anatomical landmarks, such as the joint line, is critical for successful TKR outcomes.
- Previous studies suggest joint line position impacts functional recovery, but evidence from revision TKR is less definitive.
Purpose of the Study:
- To evaluate the impact of joint line restoration on clinical outcomes after revision total knee replacement.
- To compare outcomes between knees with restored versus elevated joint lines post-revision TKR.
- To assess differences in surgical technique and resource utilization between revision of unicondylar knee replacement (UKR) and TKR.
Main Methods:
- A retrospective review of 114 patients undergoing revision TKR between 1990 and 2000 was conducted.
- Joint line height was measured on pre-operative and post-operative radiographs, classified as restored (within 5 mm) or elevated (>5 mm).
- Bristol knee scores (total and functional components) were prospectively collected and analyzed.
Main Results:
- The joint line was restored in 64% (73 knees) and elevated in 36% (41 knees).
- Revision TKR significantly improved mean Bristol knee scores from 41.1 to 80.5 (p < 0.001).
- The restored joint line group showed significantly better total and functional Bristol knee scores at one year compared to the elevated group (p < 0.01).
- Revision from UKR required less bone graft and augments, restored the joint line more often, and yielded better functional scores than revision from TKR.
Conclusions:
- Restoration of the native joint line height during revision TKR leads to significantly superior clinical outcomes and functional improvement.
- Elevating the joint line by more than 5 mm is associated with poorer patient results.
- The use of distal femoral augments should be considered to facilitate joint line restoration in revision TKR procedures.
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