FIVE YEAR RESULTS OF A RANDOMISED CONTROLLED TRIAL COMPARING MOBILE AND FIXED BEARING TOTAL KNEE REPLACEMENT

D W Murray; N Fiddian

doi:10.1302/1358-992X.94BSUPP_XXIX.BASK2011-037

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FIVE YEAR RESULTS OF A RANDOMISED CONTROLLED TRIAL COMPARING MOBILE AND FIXED BEARING TOTAL KNEE REPLACEMENT

British Association for Surgery of the Knee (BASK)

D W Murray
N Fiddian

FIVE YEAR RESULTS OF A RANDOMISED CONTROLLED TRIAL COMPARING MOBILE AND FIXED BEARING TOTAL KNEE REPLACEMENT

Murray DW, Fiddian N. FIVE YEAR RESULTS OF A RANDOMISED CONTROLLED TRIAL COMPARING MOBILE AND FIXED BEARING TOTAL KNEE REPLACEMENT. Orthop Procs. 2012;94-B(SUPP_XXIX):37-37. doi:10.1302/1358-992X.94BSUPP_XXIX.BASK2011-037

Murray, D W, and N Fiddian. “FIVE YEAR RESULTS OF A RANDOMISED CONTROLLED TRIAL COMPARING MOBILE AND FIXED BEARING TOTAL KNEE REPLACEMENT.” Orthopaedic Proceedings, vol. 94-B, no. SUPP_XXIX, 2012, pp. 37-37., https://doi.org/10.1302/1358-992X.94BSUPP_XXIX.BASK2011-037

Murray, D. W., & Fiddian, N. (2012). FIVE YEAR RESULTS OF A RANDOMISED CONTROLLED TRIAL COMPARING MOBILE AND FIXED BEARING TOTAL KNEE REPLACEMENT. Orthopaedic Proceedings, 94-B(SUPP_XXIX), 37-37. https://doi.org/10.1302/1358-992X.94BSUPP_XXIX.BASK2011-037

Murray, D. W. and Fiddian, N. (2012) “FIVE YEAR RESULTS OF A RANDOMISED CONTROLLED TRIAL COMPARING MOBILE AND FIXED BEARING TOTAL KNEE REPLACEMENT.” Orthopaedic Proceedings, 94-B(SUPP_XXIX), pp. 37-37. Available at: https://doi.org/10.1302/1358-992X.94BSUPP_XXIX.BASK2011-037

Murray, D W, and N Fiddian. “FIVE YEAR RESULTS OF A RANDOMISED CONTROLLED TRIAL COMPARING MOBILE AND FIXED BEARING TOTAL KNEE REPLACEMENT.” Orthopaedic Proceedings 94-B, no. SUPP_XXIX (2012): 37-37. https://doi.org/10.1302/1358-992X.94BSUPP_XXIX.BASK2011-037

Murray DW, Fiddian N. FIVE YEAR RESULTS OF A RANDOMISED CONTROLLED TRIAL COMPARING MOBILE AND FIXED BEARING TOTAL KNEE REPLACEMENT. Orthop Procs. 2012 Jul 1;94-B(SUPP_XXIX):37-37. https://doi.org/10.1302/1358-992X.94BSUPP_XXIX.BASK2011-037

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Abstract

Introduction

There is conflicting evidence about the merits of using mobile bearings at total knee replacement (TKR), partly because most randomised controlled trials (RCTs) have not been adequately powered.

Methods

A pragmatic multicentre RCT involving 116 surgeons in 34 UK centres was begun in 1999. Within a partial factorial design, 539 patients were randomly allocated to mobile or fixed bearings. The primary outcome measure was the Oxford Knee Score (OKS); secondary measures included SF-12, EQ-5D, costs, cost-effectiveness and need for further surgery.

Results

There was no significant difference between the groups preoperatively. At five years the mean OKS was approximately 33 in both groups. There was no significant difference between trial groups in OKS at five years (-1.21 95%CI -3.20, 0.96) or any of the other outcome measures. There was no significant difference in the proportion of patients with knee-related re-operations.

Discussion and Conclusion

In this appropriately powered RCT over the first five years after TKR, functional outcomes and re-operation rates appear to be the same whether mobile of fixed bearings are used.