 DATA ANALYSIS PLAN A sample size of 100 people, because we anticipate many will complete the Up and Go in 10 seconds and faster and will be screen fails. A total of 40 subjects will be randomized, 20 per group. The outcomes of timed up and go, Short Physical Battery, Modified Physical Performance Test MPPT, and de Morton will be compared from baseline to immediately pre-operatively and immediately post-operatively. 