Abstract
We present an update in our earlier report on the Medial Rotation Total Knee Arthroplasty (TKA) when a cohort of 228 TKAs in 189 patients (78 M; 111 F) with a mean age of 67.9 years (28 - 90) was reported at a mean follow-up of six years (1 - 13). At that time, the ten-year survivorship for revision for any reason was 94.5% (95% confidence interval (CI): 85.1 - 100), but only 21 knees were at risk at that tenth year. The 10th annual report of the National Joint Registry (NJR) of England, Wales and Northern Ireland reported a deterioration in survivorship of the Medial Rotation TKA beyond the seventh year of follow-up. This implant previously had enjoyed the lowest rate of revision for any reported brand of prosthesis. As a result, we undertook a comprehensive audit of our original cohort at a mean follow-up of 8.5 years (0 - 19). With revision for aseptic loosening, and revision for any reason as the endpoints, with 125 prostheses at risk at ten years, the ten-year survivorship was 96.7% (95% CI: 93.3 - 100) and 92.3% (95% CI: 87.7 - 93.7) respectively. We have confirmed a decline in survivorship at ten years compared to our initial report. We believe that our results probably provide a more accurate picture of the longevity of the implant than figures available from the NJR, as they are based on detailed contemporary enquiries into each patient’s circumstances. Only ten knees in seven patients were lost to follow-up in our review.
Highlights
In 2009, we reported the clinical and radiological outcome of the Medial Rotation Total Knee Arthroplasty
19 knees (19 patients) underwent revision for any reason: ten knees were revised for aseptic loosening at a mean of 7.3 years (1 to 12) years and six knees were revised due to peri-prosthetic infection at a mean of 2.1 years (0.5 to 4), two knees underwent revision in the course of the management of a periprosthetic fracture at one week and eight years respectively, and one knee was revised elsewhere for pain at one year post-operatively
Our extended survival analysis has revealed that at ten years, with 125 prostheses at risk, for revision for aseptic loosening and revision for any reason, there has been a small deterioration in the survivorship from our original report when only 25 knees are at risk [1]
Summary
In 2009, we reported the clinical and radiological outcome of the Medial Rotation Total Knee ArthroplastyHow to cite this paper: McMahon, S. and Scott, G. (2015) A Brief Follow-Up Report on 228 Medial Rotation Total Knee Replacements at a Mean of 8.5 Years (0 - 19). In 2009, we reported the clinical and radiological outcome of the Medial Rotation Total Knee Arthroplasty. How to cite this paper: McMahon, S. and Scott, G. (2015) A Brief Follow-Up Report on 228 Medial Rotation Total Knee Replacements at a Mean of 8.5 Years (0 - 19). International Journal of Clinical Medicine, 6, 928-933. Scott (TKA) (formerly Finsbury Orthopaedics, MatOrtho, Leatherhead, United Kingdom) in 228 consecutive primary cemented TKAs undertaken in 189 patients who underwent operation between October 1994 and October 2006 [1]. At a mean follow-up of six years (1 to 13), the ten year survivorship for revision for any reason was 94.5% (95% confidence intervals (CI): 85.1 - 100) and with aseptic loosening as the endpoint 98.4% Only 21 knees remained at risk at that time
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