Table 1.

Patient demographics^a and outcome score. Values are median (range)

Outcome scores	Preoperative	1 year	2 years	MD PO–2yr b	p-value c
SF-36, PCS	26 (17–40)	40 (14–51)	39 (14–59)	10 [20]	0.002
SF-36, MCS	54 (18–69)	52 (33–70)	57 (35–66)	1 [20]	0.7
AOS	58 (33–78)	33 (9–94)	34 (13–78)	–23 [16]	0.0006

^a Sex: 12 M, 11 F; Age: 62 (28–75); and BMI: 28.8 (26.0–34.5)

^b MD PO–2yr is the mean difference between preoperatively and 2 years, where the

square brackets show the sample size of the matched pairs

^c Paired 2-tailed t-tests.