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Time (years) between primary surgery and conversion to TKA
| Prior procedure | Mean | Median | SD | Minimum | Maximum |
|---|---|---|---|---|---|
| HTO, closed wedge | 6.9 | 7.0 | 3.5 | 0.4 | 14.8 |
| HTO open wedge | 6.2 | 5.9 | 3.3 | 0.8 | 14.7 |
| UKA | 4.4 | 3.5 | 3.3 | 0.2 | 14.1 |
HTO = high tibial osteotomy; UKA = unicompartmental knee arthroplasty.
