Prediction of postoperative range of motion after mobile-bearing medial unicompartmental knee arthroplasty from the preoperative range of motion and other preoperative factors.

If the preoperative flexion angle in Oxford mobile-bearing medial unicompartmental knee arthroplasty is < 140°, the postoperative flexion angle may be improved; if it exceeds 140°, the postoperative flexion angle may worsen. This predictive ability is further improved by consideration of the patient's height and the range of motion on the contralateral side.