title: Results of the Oxford Phase 3 mobile bearing medial unicompartmental knee arthroplasty from an independent center: 467 knees at a mean 6-year follow-up: analysis of predictors of failure.
abstract: A retrospective review of 467 Oxford UKAs was performed in 387 patients. Thirty-eight knees (8.1%) were revised to TKA at a mean of 49 months, most commonly for lateral compartment OA (47%). The 5-year cumulative survival using revision to TKA was 98.5%. Revisions required short stems in 26% and augments in 21% of cases. The mobile bearing dislocation rate was 0.64%. Correction of ≥3-5° from the preoperative alignment in a valgus direction was predictive of revision to TKA (P<.0001). Multivariate analysis revealed female gender (P=.002) also was associated with an increased risk of revision. Careful attention to the degree of mechanical axis correction with an overall maintained varus alignment may reduce revision rates for mobile bearing UKA.
authors: Division of Orthopaedic Surgery, Vancouver Island Health-South Island, Royal Jubilee Hospital, Victoria, BC, Canada; RebalanceMD, Victoria, BC, Canada.
authors: R Stephen J
authors: RS
authors: Burnett
authors: RebalanceMD, Victoria, BC, Canada.
authors: Rajesh
authors: R
authors: Nair
authors: University of British Columbia, Department of Emergency Medicine, Vancouver Island Health-South Island, Royal Jubilee Hospital, Victoria, BC, Canada.
authors: Christine A
authors: CA
authors: Hall
authors: Division of Orthopaedic Surgery, Vancouver Island Health-South Island, Royal Jubilee Hospital, Victoria, BC, Canada; RebalanceMD, Victoria, BC, Canada.
authors: Duncan A
authors: DA
authors: Jacks
authors: Division of Orthopaedic Surgery, Vancouver Island Health-South Island, Royal Jubilee Hospital, Victoria, BC, Canada; RebalanceMD, Victoria, BC, Canada.
authors: Luke
authors: L
authors: Pugh
authors: RebalanceMD, Victoria, BC, Canada.
authors: Megan M
authors: MM
authors: McAllister
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D061825:Metal-on-Metal Joint Prostheses; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery; D011183:Postoperative Complications; D011474:Prosthesis Design; D012086:Reoperation / Q000706:statistics & numerical data; D012189:Retrospective Studies; D012307:Risk Factors; D016896:Treatment Outcome
keywords: Oxford knee; knee arthroplasty; mobile bearing; revision; unicompartmental