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The Ring total knee replacement.
N Reissis1, G Dendrinos, E Reissis
1Redhill General Hospital, Orthopedic Research Unit, Surrey, United Kingdom.
Archives of Orthopaedic and Traumatic Surgery. Archiv Fur Orthopadische Und Unfall-Chirurgie
|January 1, 1988
Summary
The Ring Total Knee Replacement, a cementless resurfacing prosthesis, showed promising results in treating knee arthritis. Over 5 years, 75% of patients were pain-free with good deformity correction and a 94.4% survival rate.
Area of Science:
- Orthopedic Surgery
- Biomaterials Engineering
Background:
- The Ring prosthesis is an unconstrained, cementless, resurfacing knee implant.
- It consists of titanium femoral and tibial components with a polyethylene liner.
Purpose of the Study:
- To evaluate the clinical outcomes and survival rate of the Ring Total Knee Replacement.
- To assess the effectiveness of this prosthesis in patients with osteoarthritis and rheumatoid arthritis.
Main Methods:
- Prospective study of 149 patients (178 knees) from 1974 to 1985.
- Follow-up review of 132 patients (161 knees) with an average of 5.1 years.
- Computer analysis of preoperative and postoperative assessment cards (153 observations).
Main Results:
- 75.2% of knees were pain-free, and 72% had full deformity correction.
- The prosthesis survival rate was 94.4% at an average follow-up of 5.1 years.
- Excellent results in 57.2%, good in 23.6%, and poor in 19.2% of knees; 3.7% component loosening, 5% total revision rate.
Conclusions:
- The cementless Ring Total Knee Replacement demonstrates favorable short-to-medium term outcomes for knee arthritis treatment.
- High rates of pain relief, deformity correction, and prosthesis survival support its clinical utility.
- Component loosening and revision rates are comparable to other contemporary knee replacement techniques.
