Table 1.

Demographic data.

Characteristics	Group A	Group B	Total	P Value
Number of patients	20	21	41
Mean age (year)∗	57.2 ± 5.8	56.7 ± 5.4	56.9 ± 5.9 (44∼72)	.777
Sex (male/female)#	9/11	7/14	16/25	.656
Body mass index (kg/m2)∗	26.7 ± 4.8	26.6 ± 5.2	26.7 ± 4.5	.949
Preoperative KSS∗	49.4 ± 11.7	49.1 ± 11.5	49.2 ± 11.9	.934