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Hip and Knee Arthroplasty - Surface Hippy Guide to Hip Resurfacing

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Table KT16:<br />

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

Stability<br />

Number<br />

Revised<br />

Total<br />

Number<br />

Observed<br />

Component<br />

Years<br />

Revisions per<br />

100 Observed<br />

Component<br />

Years<br />

Exact 95% CI<br />

Minimal 3198 128956 405516 0.8 (0.76, 0.82)<br />

Posterior Stabilised 845 34666 87333 1.0 (0.90, 1.04)<br />

Fully Stabilised 21 696 1561 1.3 (0.83, 2.06)<br />

Hinged 19 343 786 2.4 (1.46, 3.78)<br />

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

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

Figure KT12:<br />

Cumulative Percent Revision of Primary Total <strong>Knee</strong> Replacement<br />

by Stability<br />

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

Minimal 128956 106041 84249 63357 44841 27733 12777 3284<br />

Posterior Stabilised 34666 26028 18443 12396 7550 4152 1675 416<br />

Table KT17:<br />

Yearly Cumulative Percent Revision of Primary Total <strong>Knee</strong> Replacement<br />

by Stability<br />

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

Minimal 1.0 (0.9, 1.0) 2.1 (2.0, 2.2) 2.7 (2.6, 2.8) 3.5 (3.4, 3.7) 4.1 (3.9, 4.3)<br />

Posterior Stabilised 1.2 (1.1, 1.4) 2.3 (2.1, 2.5) 3.1 (2.8, 3.3) 4.0 (3.7, 4.3) 5.2 (4.6, 6.0)<br />

151

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