Patients with osteoarthritis (OA) primarily affecting only one knee joint compartment did just as well with partial knee replacement (PKR) as with total arthroplasty after 10 years in a randomized trial -- and maybe a little bit better. Final results of the landmark TOPKAT study indicated that rates of the most clinically important outcomes were nearly equal between the two procedures, according to David Beard, DPhil, GDPhys, MCSP, MSc, of the University of Oxford in England, and colleagues. These similarities included Oxford Knee Score (OKS) values both at year 10 and cumulatively during the entire follow-up period, as well as reoperations and revisions.