Abstract
Aim: To assess the survival rate of implants and the effect of UKR on knee pain, function, stiffness and quality of life in a prospective study.
Methods: All of the knee replacements were performed using minimally invasive techniques. SF36 and WOMAC were evaluated pre-operatively and at six-monthly intervals post-operatively.
Results: There were 506 knees. The mean post-operative evaluation time was two years and six months and the maximum time was three years and nine months. The status of all knees was established. There were nine failures as determined by the need for revision procedures. Six patients died with their implants functioning.
Survival analysis: 99% at 12 months 98% at 24 months 98% at 36 months.
The scores on SF36 and WOMAC were adjusted to the Australian Population Norm. The WOMAC score showed an increase in function, and a decrease in the pain and stiffness scores. The physical and mental component summaries of the SF-36 both indicated an increased quality of life post-operatively. Implant failure was due to loosening of tibial and femoral components and progression of arthritic changes in the lateral compartments.
Conclusion: The results from the health assessment forms indicated a high patient satisfaction with the operation and a sustained improvement in quality of life, flexibility and function.
The abstracts were prepared by Professor A. J. Thurston. Correspondence should be addressed to him at the Department of Surgery, Wellington School of Medicine, PO Box 7343, Wellington South, New Zealand
