Medial unicompartmental knee replacement in the under-50s.
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.
Parratte
S
S
Aix-Marseille University, Marseille, France.
Argenson
J-N A
JN
Pearce
O
O
Pauly
V
V
Auquier
P
P
Aubaniac
J-M
JM
D000328:Adult; D000367:Age Factors; D019645:Arthroplasty, Replacement, Knee / Q000379:methods* / Q000534:rehabilitation; D002484:Cementation; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D020370:Osteoarthritis, Knee / Q000534:rehabilitation / Q000601:surgery; D011475:Prosthesis Failure; D011859:Radiography; D020127:Recovery of Function; D012086:Reoperation; D016896:Treatment Outcome