Format

Send to

Choose Destination
Clin Orthop Relat Res. 2010 Jan;468(1):73-81. doi: 10.1007/s11999-009-0975-7. Epub 2009 Jul 14.

Does bearing design influence midterm survivorship of unicompartmental arthroplasty?

Author information

1
University Hospital, London Health Sciences Centre, London, Ontario, Canada. jpwhittaker1@gmail.com

Abstract

Medial unicompartmental arthroplasties (UKA) are available with mobile- and fixed-bearing designs, with the advantages of one bearing over another unproven. We questioned whether the bearing design influenced clinical outcome, survivorship, the reason for revision, or the timing of failures. We retrospectively reviewed 179 patients (229 knees) who had medial unicompartmental knee arthroplasties between 1990 and 2007; of these 79 knees had a mobile-bearing design and 150 knees a fixed-bearing design. Patients with mobile-bearing UKA had a minimum followup of 1 year (mean, 3.6 years; range, 1-11.3 years); those with fixed-bearing UKA a minimum followup of 1 year (mean, 8.1 years; range, 1-17.8 years). Patients were evaluated with clinical outcome scores and radiographically using the Knee Society rating system. Seven of 79 (9%) mobile-bearing knees underwent revision at a mean of 2.6 years, and 22 of 150 (15%) fixed-bearing knees underwent revision at a mean of 6.9 years. The 5-year cumulative survival rates were 88% (SE +/- 0.47, 95% CI 0.7229-1) and 96% (SE +/- 0.16, 95% CI 0.93-0.9979) for the mobile- and fixed-bearing designs respectively using the endpoint of revision surgery. We observed no differences in the indications or complexity of revision surgery between the groups and none in midterm survivorship.

LEVEL OF EVIDENCE:

Level III, comparative study. See Guidelines for Authors for a complete description of levels of evidence.

PMID:
19597898
PMCID:
PMC2795843
DOI:
10.1007/s11999-009-0975-7
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Wolters Kluwer Icon for PubMed Central
Loading ...
Support Center