Medium-term results of Oxford phase-3 medial unicompartmental knee arthroplasty.

Abstract:

PURPOSE:To review medium-term results of 49 consecutive patients who underwent Oxford phase-3 medial unicompartmental knee arthroplasty by a single surgeon. METHODS:Records of 28 women (mean age, 71 years) and 21 men (mean age, 68 years) who underwent minimally invasive Oxford phase-3 medial unicompartmental knee arthroplasty by a single surgeon were retrospectively reviewed. The Oxford knee score and visual analogue scale (VAS) scores for pain and satisfaction were assessed at the latest follow-up by an independent observer, as were postoperative radiographs for implant position, osteoarthritic changes in the non-replaced compartments, and radiolucent lines of >2 mm or implant subsidence. The survival rate was calculated using Kaplan-Meier survival analysis. Patient demographics, postoperative alignment (varus/ valgus), Oxford knee scores, and the progression of osteoarthritis in the other compartments were included in a multiple logistic regression (MLR) analysis to identify significant factors affecting the probability of being satisfied (VAS scores for satisfaction of ≤2). RESULTS:The mean follow-up duration was 7.2 years. No patient was lost to follow-up. Two patients with no knee symptoms died (unrelated to surgery) before the 5-year follow-up. The cumulative survival rate at the 9-year follow-up was 91.2% (95% confidence interval, 87.6-94.5%). There were 4 early failures (before 4 years). One patient early in the series developed avascular necrosis of the lateral femoral condyle with an over-corrected tibiofemoral valgus of 12º at 8 months; the other 3 complained of anterior knee pain, without signs of osteoarthritis. All 4 patients underwent revision with total knee arthroplasty. There were 43 patients with more than 5 years of follow-up and without revision of the prosthesis. Patients who were not satisfied (n=6) were more likely to be <65 years old (n=4, adjusted odds ratio [OR], 3.1; MLR p=0.002) and male (n=4; adjusted OR, 2.3; MLR p=0.02). Six of the 43 patients had lucent lines on radiographs, all of which were partial and under the tibial component. Progression of the arthritis in the patellofemoral and/or lateral compartments was worse in 5 patients. CONCLUSION:Careful patient selection and good surgical technique contributed to good outcome. Younger male patients should be counselled regarding the higher chance of limited satisfaction.

authors

Clement ND,Duckworth AD,MacKenzie SP,Nie YX,Tiemessen CH

doi

10.1177/230949901202000204

subject

Has Abstract

pub_date

2012-08-01 00:00:00

pages

157-61

issue

2

eissn

1022-5536

issn

2309-4990

journal_volume

20

pub_type

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