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Hip and Knee Arthroplasty - Surface Hippy Guide to Hip Resurfacing

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Primary Bipolar <strong>Hip</strong> Replacement Prostheses<br />

with a higher than anticipated Revision Rate<br />

Table HP39:<br />

Individual Primary Bipolar <strong>Hip</strong> Prostheses identified as having a higher than<br />

anticipated Revision Rate<br />

Bipolar Head/<br />

Femoral Component<br />

Total<br />

Number<br />

Observed<br />

Component<br />

Years<br />

Revisions per<br />

100 Observed<br />

Component<br />

Years<br />

Hazard<br />

Ratio<br />

P Value<br />

HR 95%<br />

CI<br />

Re-identified <strong>and</strong> still used<br />

UHR/Omnifit 312 1017 1.77 1.986 0.0053 (1.23, 3.22)<br />

*Bipolar Head (Biomet) 118 272 2.95 2.572 0.0089 (1.27, 5.22)<br />

Newly Identified<br />

UHR/ABGII 144 345 2.32 2.156 0.0329 (1.06, 4.37)<br />

Note:<br />

All components have been compared <strong>to</strong> all other Bipolar components.<br />

* Bipolar Head Component<br />

Table HP40:<br />

Yearly Cumulative Percent Revision of Individual Primary Bipolar <strong>Hip</strong><br />

Prostheses identified as having a higher than anticipated Revision Rate<br />

CPR 1 Yr 2 Yrs 3 Yrs 5 Yrs 7 Yrs<br />

Re-identified <strong>and</strong> still used<br />

UHR/Omnifit 5.2 (3.2, 8.4) 5.6 (3.5, 9.0) 5.6 (3.5, 9.0) 6.2 (3.9, 9.9)<br />

*Bipolar Head (Biomet) 6.3 (3.0, 12.8) 7.6 (3.8, 14.8) 7.6 (3.8, 14.8) 7.6 (3.8, 14.8)<br />

Newly Identified<br />

UHR/ABGII 3.9 (1.6, 9.1) 3.9 (1.6, 9.1) 5.1 (2.3, 11.3) 9.9 (4.5, 20.7)<br />

Table HP41:<br />

Yearly Usage of Individual Primary Bipolar <strong>Hip</strong> Prostheses identified as<br />

having a higher than anticipated Revision Rate<br />

Year of Implant 1999 2000 2001 2002 2003 2004 2005 2006 2007<br />

Re-identified <strong>and</strong> still used<br />

UHR/Omnifit 5 25 47 68 59 42 31 24 11<br />

*Bipolar Head (Biomet) 1 3 6 16 19 20 16 19 18<br />

Newly Identified<br />

UHR/ABGII 0 0 1 24 25 36 34 10 14<br />

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