Trial of Unicompartmental Versus Total Knee Arthroplasty

Inclusion Criteria: * medial compartment osteoarthritis of the knee * knee flexion greater than greater than 90 degrees * flexion contracture of less than 10 degrees * varus deformity \< 20 degrees * grade IV degeneration of the medial compartment Exclusion Criteria: * lateral compartment degenerative changes * previous lateral meniscectomy * anterior cruciate ligament deficiency * body mass index \> 40 * inflammatory arthritis * history of septic arthritis * hemoglobin A1c \> 8.0 * chronic liver disease * stage 3A or greater chronic renal disease * active IV drug abuse * patients requiring thromboembolic prophylaxis