Unicompartmental knee arthroplasty (UKA) is an effective treatment for medial unicompartmental knee osteoarthritis.Largenumber of literatures have proved that the UKA does relieve joint pain, correct joint deformity and restore joint function, However, UKAleads to biomechanical changes of the knee in some extent despite of its satisfactory clinical outcomes.This paper will systematically reviewpostoperatively biomechanical variations of Oxford mobile- bearing medial UKA, involving cadaveric study, finite element analysis, gaitanalysis and others.