The Oxford medial unicompartmental knee replacement: Survival and the affect of age and gender

• Published in: The knee Vol. 19; no. 6; pp. 913 - 917
• Main Authors: Matharu, Gulraj, Robb, Curtis, Baloch, Khalid, Pynsent, Paul
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01-12-2012; Elsevier Limited
• Subjects: Age Factors; Arthroplasty, Replacement, Knee; Cohort Studies; Female; Humans; Knee Prosthesis; Male; Orthopedics; Osteoarthritis, Knee - pathology; Osteoarthritis, Knee - physiopathology; Osteoarthritis, Knee - surgery; Patient Selection; Prosthesis Design; Prosthesis Failure; Range of Motion, Articular; Recovery of Function; Revision surgery; Risk Factors; Sex Factors; Survival; Treatment Outcome; Unicompartmental knee replacement; Revision surgery; Survival; Unicompartmental knee replacement
• ISSN: 0968-0160; 1873-5800
• DOI: 10.1016/j.knee.2012.03.004

Abstract Study aims To determine the survival and functional outcome for the phase 3 Oxford unicompartmental knee replacement (UKR) performed at a single independent centre and to assess whether age and gender affect survival. Patients and methods Between 2000 and 2008, 459 consecutive Oxford UKRs were implanted in 392 patients using a minimally invasive technique. Results Mean age of patients was 63.0 years and 53% were female. Mean follow-up was 4.4 years (range 0.5–11.2 years). No patient was lost to follow-up and 411 (90%) knees had a minimum follow-up of 2 years. Twenty knees (4.4%) have undergone revision to total knee replacement at a mean time of 3.2 years. Aseptic component loosening (n = 11) accounted for most failures. Cumulative survival was 94.4% at 5 years (95% confidence interval 90.9–97.0) and 93.0% at 8 years (95% confidence interval 84.8–96.2). The median postoperative Oxford knee score was 31.2% (interquartile range 12.2%–52.1%) at latest follow-up. Age and gender had no statistically significant affect on UKR survival. Conclusions This large independent series demonstrates good medium-term survival and functional outcome can be achieved with the phase 3 Oxford UKR in appropriately selected patients. Age and gender should not be considered contraindications for performing Oxford UKR.