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Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXIX | Pages 236 - 236
1 Sep 2012
Roche J Joss B DeSteiger R Miller L Nivbrant B Wood D
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There is ongoing debate on the benefits of fixed versus mobile bearing Unicompartmental Knee Replacement (UKR). We report the results from a randomised controlled trial comparing fixed and mobile bearing of the same UKR prosthesis. Forty patients were randomized to receive identical femoral components and either a fixed or mobile bearing tibial component. At 6.5 years follow-up 37% of the mobile bearing design had been revised and 14% for the fixed bearing design. The main reasons for revision were pain and loosening. These results were compared with data from The Australian Orthopaedic Association National Joint Replacement Registry (AOANJRR) that show a cumulative percent revision of 24.2% for the mobile bearing Preservation UKR at 6.5 years. All locally explanted mobile bearings were examined microscopically, and 83% demonstrated significant backside wear. Constraint on the undersurface of the bearing coupled with a congruent upper surface may have contributed to the excessive revision rate. This is the first randomised controlled trial examining mobile and fixed variations of the same UKR prosthesis and shows this design of UKR with the mobile bearing has an unacceptably high revision rate and patients with this knee design should be closely monitored.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXIX | Pages 123 - 123
1 Sep 2012
Khan L Page R Miller L Graves S
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Aims

To report the rate of early revision (within two years) after shoulder arthroplasty and identify any patient, disease or prosthesis factors that may be associated with these early failures.

Methods

The AOA National Joint Replacement Registry has recorded 7113 shoulder arthroplasty procedures up to December 2009. Data recorded includes diagnosis, patient demographics and prosthesis details. The main outcome of this analysis was the time to first revision of all primary shoulder arthroplasty recorded by the Registry.

The cumulative per cent revision (CPR) of shoulder arthroplasty procedures was estimated using the Kaplan-Meier method. Cox proportional hazard models were used to test significance between groups