Progressive Rehabilitation Following Total Knee Arthroplasty

The purpose of this study is to evaluate the effectiveness of a progressive resistance rehabilitation program (PROG) after total knee arthroplasty (TKA) compared to a traditional rehabilitation program (TRAD). The investigators hypothesized: * PROG will result in greater improvements in functional outcome measures such as: stair climbing test (SCT), timed-up-and-go test (TUG), six minute walk test (6MW), the Knee Injury and Osteoarthritis Outcome Survey (WOMAC), and knee range of motion (ROM). * PROG will result in greater improvements in quadriceps muscle strength gains after TKA compared to TRAD. * PROG will result in greater improvements in muscle mass and central activation compared to TRAD.