Table 2.

Quality-of-life outcomes

Minimum 2-year followup	Mean	Standard deviation	Minimum	Maximum
WOMAC function	78.3	18.8	30.9	100.0
WOMAC stiffness	82.6	17.4	37.5	100.0
WOMAC pain	89.9	15.2	40.0	100.0
WOMAC global	81.3	15.8	33.3	100.0
Oxford score	80.3	16.6	33.3	100.0
SF-12 physical component	44.1	8.5	26.3	58.9
SF-12 mental component	53.9	9.8	28.4	67.1
UCLA	4.9	2.1	2.0	10.0
Satisfaction scores
Pain	95.4	19.4	0.0	100.0
Function	88.5	18.4	33.3	100.0
Recreational	85.6	20.9	33.3	100.0
Overall	95.6	11.5	66.7	100.0
Total score	92.0	13.3	58.3	100.0

Baseline quality of life	Mean	Standard deviation	Minimum	Maximum
WOMAC function	39.8	20.8	8.8	80.9
WOMAC stiffness	45.0	17.7	12.5	75.0
WOMAC pain	42.8	15.9	15.0	80.0
WOMAC global	41.0	17.8	12.5	79.2
Oxford score	34.6	18.0	0.0	70.5
SF-12 physical component	30.4	9.5	18.8	51.3
SF-12 mental component	45.0	12.1	20.4	64.2

Standard response mean	< 0.8	> 0.8 (large effect)	Percentage of large effect
WOMAC function	4	18.0	75
WOMAC stiffness	5	18.0	75
WOMAC pain	1	22.0	92
WOMAC global	4	18.0	75
Oxford score	4	20.0	83
SF-12 physical component	7	14.0	56
SF-12 mental component	12	9.0	36

Effect size	< 0.8	> 0.8 (large effect)	Percentage of large effect
WOMAC function	4	18.0	75
WOMAC stiffness	5	18.0	75
WOMAC pain	1	22.0	92
WOMAC global	2	20.0	83
Oxford score	2	22.0	92
SF-12 physical component	5	16.0	64
SF-12 mental component	12	9.0	36