Fixed bearing lateral unicompartmental knee arthroplasty-Short to midterm survivorship and knee scores for 101 prostheses

Smith, James R.A.; Robinson, James R.; Porteous, Andrew J.; Murray, James R.D.; Hassaballa, Mohammad A.; Artz, Neil; Newman, John H.

Abstract

Background: Isolated unicompartmental knee arthritis is less common laterally than medially. Lateral unicompartmental knee arthroplasty (UKA) constitutes only 1% of all knee arthroplasty performed. Use of medial UKA is supported by several published series showing good long-term survivorship and patient satisfaction, in large patient cohorts. Results of lateral UKA however have been mixed. We present the short and mid-term survivorship and 5-year clinical outcome of 101 lateral UKAs using a single prosthesis. Methods: Over a 9. year period, 100 patients who satisfied inclusion criteria underwent a lateral fixed-bearing unicompartmental arthroplasty. American Knee Society (AKSS), Oxford Knee (OKS) and modified Western Ontario McMaster Universities Arthritis Index (WOMAC) scores were completed preoperatively and at 1, 2 and 5. years postoperatively. Kaplan-Meier survival analysis was used to determine the 2-year and 5-year survivorship, using revision for any cause as end point. Results: Survivorship was 98.7% and 95.5% at 2 and 5. years respectively. 1 knee was revised for subsidence of the tibial component and 1 knee for progression of medial compartment osteoarthritis. Of a possible 35 knees in situ at 5. year follow-up, 33 knees were fully scored. Median AKSS, OKS and modified WOMAC scores were 182, 41, and 16 respectively. Conclusions: The mid-term survivorship and outcome scores at 5-years suggest that lateral unicompartmental knee arthroplasty provides a valuable alternative to total joint replacement in selected patients with isolated lateral tibio-femoral arthritis at mid-term follow-up.Level II evidence. © 2014 Elsevier B.V.

• Journal Article Type: Article
• Acceptance Date: Apr 1, 2014
• Online Publication Date: Apr 12, 2014
• Publication Date: Jan 1, 2014
• Deposit Date: Jul 2, 2019
• Journal: Knee
• Print ISSN: 0968-0160
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 21
• Issue: 4
• Pages: 843-847
• DOI: https://doi.org/10.1016/j.knee.2014.04.003
• Public URL: https://uwe-repository.worktribe.com/output/1467314
• Publisher URL: https://doi.org/10.1016/j.knee.2014.04.003