2017 ISAKOS Biennial Congress ePoster #1258

 

Survivorship Analysis Of An Uncemented Mobile Bearing Total Articular Condylar Knee (Tack) Prosthesis

Mohit Bansal, MBBS, MS, London UNITED KINGDOM
Shaishav Bhagat, MBBS, MS, FRCS, Cambridge UNITED KINGDOM
Richard Barrington, FRCS, Kettering UNITED KINGDOM

Kettering General Hospital, Kettering, Northamptonshire, UNITED KINGDOM

FDA Status Not Applicable

Summary

TACK system was developed in the late 1980s as an alternative in mobile bearing designed knees. We present long term results of single centre comparable to other published series

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Abstract

Background

The total articular condylar knee (TACK) system was developed in the late 1980s as an alternative in mobile bearing designed knees. The aim of study was to evaluate long term results for a selected series of patients younger than 65 years or physiologically fit and active patients over 65 treated in a single centre, by a single surgeon (Senior Author, RLB) with cement-less total condylar articulating knee prosthesis (TACK, Waldemar Link GmbH & Co, Hamburg, Germany).

Methods

From 1987 to 2002, 170 knees in 139 patients were operated using TACK prosthesis. Average follow up was 10.8 years (5-19). There were 73 men and 66 women at an average age of 59 years (21-91). Main diagnosis included osteoarthritis (68 %) and rheumatoid arthritis (28.7 %). Senior author using hospital for special surgery knee score assessed all patients. Kaplan Meier survival of the implant was evaluated with revision taken as endpoint.

Result:
The average preoperative score was 45.32 (19-82, SD 13.24), which improved post-operatively to a score of 83.87 (45-98, SD 10.17). Range of motion averaged 85? (65-130) preoperatively and increased to 103? (70-130) post-operatively. There were 17 re-operations including revision for any reason. The Kaplan-Meier survival estimates taking revision for any reason showed that the probability of the survival of the implant was 90% (95% CI, 84% to 95%) at 10 years and 86% at 15 years. (95% CI, 80% to 93%). There was no difference in survival between either sex (P=0.23) or diagnosis (OA/RA, P=0.79) or age groups (>65 or <65).

Conclusion

The results of the study compare favourably to the other studies that report long term outcome in younger age group. Mobile bearing cementless knee design (TACK) may produce similar results if not superior as compared to conventional cemented fixed bearing designs.