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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
PubMed
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See all related articles

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:

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  • 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.