Short-term results of the Oxford phase 3 unicompartmental knee arthroplasty for medial arthritis

Abstract

Objectives: We evaluated short-term results of the Oxford phase 3 unicompartmental knee arthroplasty (UKA) in patients with medial compartment arthritis.
Methods: The study included 38 patients (28 females, 10 males; mean age 67 years; range 56 to 75 years) who underwent UKA for isolated medial knee osteoarthritis. At the time of surgery, 28 patients were in the age group of 56-64 years, and 10 patients were in the age group of 65-75 years. All the patients had Ahlbäck grade 2 primary medial compartment arthritis that had been unresponsive to conservative treatment. None of the patients had symptoms of patellofemoral arthrosis. Patients underwent UKA with the Oxford phase 3 cemented meniscal-bearing unicondylar prosthesis using minimally invasive surgery. The results were assessed preoperatively and at final controls according to the Knee Society clinical and functional rating system. Postoperative radiographic evaluations were made according to the Oxford criteria. The mean follow-up period was 24 months (range 18 to 32 months).
Results: The mean preoperative active knee flexion increased from 121.8° (range 110° to 130°) to 130.9° (range 120° to 140°) postoperatively (p