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Unicompartmental or total knee arthroplasty?: Results from a matched study
Anish K Amin1, James T Patton, Robert E Cook
1From the Department of Orthopaedics, Queen Margaret Hospital, Dunferm-line, Fife, UK.
Clinical Orthopaedics and Related Research
|June 9, 2006
Summary
Unicompartmental knee arthroplasty offers greater range of motion, but total knee arthroplasty shows higher 5-year survivorship. Both procedures yield similar midterm clinical outcomes for knee osteoarthritis patients.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
Background:
- Direct comparative studies on unicompartmental knee arthroplasty (UKA) and total knee arthroplasty (TKA) are limited.
- Both UKA and TKA are surgical options for knee osteoarthritis.
Purpose of the Study:
- To compare the outcomes of UKA and TKA, focusing on active range of motion, Knee Society scores, and 5-year survivorship.
- To evaluate the reliability and complication rates of UKA versus TKA.
Main Methods:
- A prospective study comparing 54 unilateral UKAs with 54 matched unilateral TKAs.
- Patients were matched for age, gender, BMI, and preoperative scores. Follow-up was conducted at 6, 18, 36, and 60 months, with a mean follow-up of 59 months.
Main Results:
- UKA demonstrated a greater mean postoperative active range of motion compared to TKA.
- No significant differences were observed in the overall Knee Society knee and function scores between the two groups.
- The 5-year survivorship rate was 88% for UKA versus 100% for TKA (worst-case scenario: 85% for UKA, 98% for TKA).
Conclusions:
- Total knee arthroplasty (TKA) proved to be a more reliable procedure with a higher 5-year survivorship rate.
- Midterm clinical outcomes were comparable, but UKA may be associated with a higher complication rate.