Ten year survivorship after cemented and uncemented medial Uniglide® unicompartmental knee arthroplasties.
BACKGROUND
Results of knee replacement registries have shown that unicompartmental knee arthroplasty (UKA) has a significantly higher revision and failure rate than current state-of-the-art TKA. The aim of this prospective study is to evaluate the long-term outcomes and to calculate the 10 year survival of knees with medial osteoarthritis treated with Uniglide® UKA.


METHODS
Two hundred thirty-four patients were assessed by an independent clinical observer using the American Knee Society Clinical Rating System, a validated outcome measure. Kaplan-Meier analysis was used to calculate the 10 year survival rates using revision surgery for any cause as the end point.


RESULTS
There were no revisions due to progression of lateral osteoarthritis or polyethylene failure. There were one traumatic and three non-traumatic bearing dislocations and two revisions due to aseptic loosening of the tibial component. One joint was revised for traumatic ligament rupture, one for synovitis from bearing impingement, one due to femoral component mal-positioning and one for infection. A total of 10 cases were revised due to failures for any cause in the 61 patients withdrawn because they had died, thus giving a cumulative survival rate at 10 years of 95.57%. The knee (function) score showed an increase from 33.4 (54.7) pre-operatively to 94 (83.4) points post-operatively. The average range of motion increased from 107 to 122° (p<0.01).


CONCLUSION
Based on our findings we believe that the Uniglide® unicompartmental knee prosthesis offers a safe and effective solution for the treatment of medial compartment osteoarthritis.
['Schlueter-Brust|Klaus|K|', 'Kugland|Karoline|K|', 'Stein|Gregor|G|', 'Henckel|Johann|J|', 'Christ|Hildegard|H|', 'Eysel|Peer|P|', 'Bontemps|Gustav|G|']
D000328:Adult D000368:Aged D000369:Aged, 80 and over D019645:Arthroplasty, Replacement, Knee D002484:Cementation D005260:Female D005500:Follow-Up Studies D006801:Humans D007720:Knee Prosthesis D008297:Male D008875:Middle Aged D020370:Osteoarthritis, Knee D011446:Prospective Studies D011474:Prosthesis Design D011475:Prosthesis Failure D016059:Range of Motion, Articular D012086:Reoperation D013997:Time Factors D016896:Treatment Outcome
Cemented Uncemented UKA Survival Mobile bearing