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[Better than their reputation?--5 to 20 years outcome with single compartment knee joint endoprostheses in medial osteoarthritis of the knee]].

AIM OF THE STUDY
Long-term results of unicompartmental arthroplasty (UCA) in medial osteoarthritis are analyzed and the influencing covariates were explored.


METHODS
261 UCA in 229 patients were evaluated mainly by use of a structured questionnaire, 98.5% of the UCA were analyzed after 10 (5-20) years.


RESULTS
In the Knee Sec. Score, the items pain and function were improved significantly. Patients were very content with the UCA. Failures (total 30) were especially caused by destruction of the non-replaced compartment (n = 11) and loosening of the tibial component (n = 5). Survival with aseptic failures as the endpoint was 84.9% after 10 and 74.4% after 20 years. Gender, age at operation, design (St. Georg, Tönnis, Endo, Wessinghage) and height of tibial component could not be proved as determining covariates with sufficient statistical significance.


CONCLUSION
Cemented unicompartmental knee arthroplasties show good long-term results in medial osteoarthritis, when the criteria for the indication are strictly respected.