Table 2.

Western Ontario and McMaster (WOMAC) osteoarthritis index pain outcome scores, subsidence and follow-up times

Result	Mean	95% confidence interval
Average follow-up	36.3 months (range 6–84)	–
Pre-operative WOMAC	33.5	31.0–36.0
Post-operative WOMAC	10.7	8.4–13.0
Subsidence	0.79 mm (range 0–2.81)	0.57–1.01
Rate of subsidencea	0.43 mm/year	0.24–0.62

^aResults for 40 patients, as 17 patients showed no subsidence