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Journal of Bone and Joint Surgery - British Volume, Vol 91-B, Issue 3, 351-356.
doi: 10.1302/0301-620X.91B3.21588  
Copyright © 2009 by British Editorial Society of Bone and Joint Surgery
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Medial unicompartmental knee replacement in the under-50s

S. Parratte, MD, Orthopaedic Surgeon1; J.-N. A. Argenson, MD, Professor of Orthopaedic Surgery1; O. Pearce, FRCS, Orthopaedic Surgeon1; V. Pauly, MS, Statistician2; P. Auquier, MD, PhD, Professor3; and J.-M. Aubaniac, MD, Professor of Orthopaedic Surgery1

1 Department of Orthopaedic Surgery
2 Department of Medical Computer Science, Hopital Sainte-Marguerite, 270 Boulevard Saint-Marguerite, 13009 Marseille, France.
3 Department of Public Health, Timone Faculty of Medical Science Aix-Marseille University, Marseille, France.

Correspondence should be sent to Dr J.-N. A. Argenson; e-mail: jean-noel.argenson{at}ap-hm.fr

We retrospectively reviewed 35 cemented unicompartmental knee replacements performed for medial unicompartmental osteoarthritis of the knee in 31 patients ≤50 years old (mean 46, 31 to 49). Patients were assessed clinically and radiologically using the Knee Society scores at a mean follow-up of 9.7 years (5 to 16) and survival at 12 years was calculated. The mean Knee Society Function Score improved from 54 points (25 to 64) pre-operatively to 89 (80 to 100) post-operatively (p < 0.0001). Six knees required revision, four for polyethylene wear treated with an isolated exchange of the tibial insert, one for aseptic loosening and one for progression of osteoarthritis.

The 12-year survival according to Kaplan-Meier was 80.6% with revision for any reason as the endpoint. Despite encouraging clinical results, polyethylene wear remains a major concern affecting the survival of unicompartmental knee replacement in patients younger than 50.






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Registered charity no: 209299     Print ISSN: 0301-620X
Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General