Improved Outcomes in Compartmental approach to revision of p
This study investigated the gait and patient reported outcome measures of subjects converted from a partial knee arthroplasty to combined partial knee arthroplasty, using a compartmental approach.

23 patients converted from partial to combined partial knee arthroplasty were measured on the instrumented treadmill at top walking speeds, using standard gait metrics. Data were compared to healthy controls (n=22) and primary posterior cruciate-retaining total knee arthroplasty subjects (n=23) where surgery were performed for one or two-compartment osteoarthritis.

--Subjects revised from partial to combined partial knee arthroplasty walked 16% faster than total knee arthroplasty, demonstrating nearer-normal weight-acceptance rate, maximum weight-acceptance force, mid-stance force, contact time, double support time, step length and stride length compared to primary TKA.

--Combined partial knee arthroplasty subjects had a median Oxford Knee Score of 43 vs. 38 and reported a median EQ-5D 0.94 vs. 0.84.

When compared to whole knee arthroplasty, a compartmental approach to native compartment degeneration after partial knee arthroplasty results in a more normal gait and improved patient satisfaction.