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Fixed or mobile bearing unicompartmental knee replacement? A comparative cohort study
R E Gleeson1, R Evans, C E Ackroyd
1Avon Orthopaedic Centre, Southmead Hospital, Bristol, UK.
The Knee
|September 8, 2004
Summary
The St. Georg Sled unicompartmental knee replacement (UKR) showed better pain relief and fewer complications than the Oxford mobile bearing UKR at two years. Functional outcomes were similar between the two knee replacement types.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
Background:
- Unicompartmental knee replacement (UKR) is effective for anteromedial osteoarthritis.
- Existing studies confirm good medium and long-term outcomes for UKR.
Purpose of the Study:
- To compare short-term clinical outcomes and complications.
- To evaluate the St. Georg Sled fixed bearing UKR against the Oxford mobile bearing UKR.
Main Methods:
- Prospective study comparing two UKR types.
- Outcome assessment at 2 years using Bristol and Oxford knee scores.
- Complication recording post-2-year follow-up.
Main Results:
- St. Georg Sled group demonstrated superior outcome measures at 2 years.
- Significantly better pain relief in the St. Georg Sled group (Bristol knee score, p=0.013).
- Oxford group experienced higher re-operation rates due to dislocations and revisions.
Conclusions:
- The St. Georg Sled UKR offers better short-term pain relief compared to the Oxford mobile bearing UKR.
- The Oxford mobile bearing prosthesis had a higher short-term re-operation rate.
- Functional scores were comparable between the two unicompartmental knee replacement designs.
