TABLE 1.

Demographic data for matched pairs

	Pre-op flexion	Follow-up (months)	Age (years)	Sex (f, m)	Weight (kg)
RP	113.1°	16.9	64.8	62.5%, 37.5%	99.6
RP-F	113.1°	16.5	63.0	53%, 47%	99.3
P value*	0.99	0.68	0.26	0.28	0.93

RP= Sigma Rotating Platform

RP-F= Sigma Rotating Platform High Flex

^*Two-tailed Student's t-test and chi square test (for sex)