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Hip and Knee Arthroplasty - Surface Hippy Guide to Hip Resurfacing

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Table KT14:<br />

Primary Total <strong>Knee</strong> Replacement requiring Revision by Bearing Mobility<br />

Bearing<br />

Mobility<br />

Number<br />

Revised<br />

Total<br />

Number<br />

Observed<br />

Component<br />

Years<br />

Revisions per 100<br />

Observed<br />

Component Years<br />

Exact 95%<br />

CI<br />

Fixed 2657 117540 352899 0.8 (0.72, 0.78)<br />

Rotating 1227 41461 120553 1.0 (0.96, 1.08)<br />

Sliding 42 956 5355 0.8 (0.57, 1.06)<br />

Rotating - Sliding 157 4704 16388 1.0 (0.81, 1.12)<br />

Unknown 4 103 316 1.3 (0.34, 3.24)<br />

Total 4087 164764 495511 0.8 (0.80, 0.85)<br />

Figure KT11:<br />

Cumulative Percent Revision of Fixed Bearing <strong>and</strong> Mobile Bearing<br />

Primary Total <strong>Knee</strong> Replacement<br />

Number at Risk 0 Yr 1 Yr 2 Yrs 3 Yrs 4 Yrs 5 Yrs 6 Yrs 7 Yrs<br />

Fixed 117540 94821 73507 53939 37442 22800 10343 2672<br />

Mobile 47121 37896 29657 22150 15180 9216 4155 1039<br />

Note:<br />

Mobile is the combination of the Rotating, Rotating-Sliding <strong>and</strong> Sliding groups.<br />

Table KT15:<br />

Yearly Cumulative Percent Revision of Fixed Bearing <strong>and</strong> Mobile<br />

Bearing Primary Total <strong>Knee</strong> Replacement<br />

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

Fixed 1.0 (0.9, 1.0) 1.9 (1.9, 2.0) 2.5 (2.4, 2.6) 3.3 (3.2, 3.4) 4.0 (3.8, 4.2)<br />

Mobile 1.2 (1.1, 1.3) 2.6 (2.4, 2.7) 3.4 (3.2, 3.5) 4.5 (4.2, 4.7) 5.1 (4.8, 5.5)<br />

.<br />

150

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