Clin Orthop Surg.  2017 Dec;9(4):432-438. 10.4055/cios.2017.9.4.432.

Predictors of Midterm Outcomes after Medial Unicompartmental Knee Arthroplasty in Asians

Affiliations
  • 1Department of Orthopaedic Surgery, Singapore General Hospital, Singapore. hamidrazak@gmail.com
  • 2Centre for Quantitative Medicine, Duke-NUS Medical School, Singapore.

Abstract

BACKGROUND
This study was designed to evaluate predictors of good outcomes following medial unicompartmental knee arthroplasty (UKA) in Asian patients.
METHODS
Registry data of patients who underwent primary unilateral medial UKA from 2006 to 2011 were collected. Outcomes studied were the Oxford Knee Score (OKS) and the Physical Component Score (PCS) of the Short Form 36 (SF-36) questionnaire. These outcome scores were collected prospectively, pre- and postoperatively up to 5 years. Good outcome was defined as an overall improvement in score greater than or equal to the minimal clinically important difference (MCID). The MCID for the OKS was 5 while the MCID for the PCS was 10. Regression analysis was used to identify predictors of good outcomes following medial UKA.
RESULTS
Primary medial UKA was performed in 1,075 patients. Higher (poorer) preoperative OKS (odds ratio [OR], 1.27; p < 0.001), lower (poorer) preoperative PCS (OR, 1.08; p < 0.001), lower (poorer) preoperative Knee Society Knee Score (KSKS; OR, 1.02; p < 0.001) and higher (better) preoperative SF-36 Mental Component Score (MCS; OR, 1.02; p < 0.001) were significant predictors of good outcomes.
CONCLUSIONS
Patients with poorer OKS, PCS and KSKS and better SF-36 MCS preoperatively tended to achieve good outcomes by the MCID criterion at 5 years following the index surgery.

Keyword

Knee; Osteoarthritis; Arthroplasty; Registries; Asia

MeSH Terms

Aged
*Arthroplasty, Replacement, Knee
*Asian Continental Ancestry Group
Female
Humans
Male
Middle Aged
Minimal Clinically Important Difference
Osteoarthritis, Knee/*surgery
Postoperative Period
Preoperative Period
Registries
*Surveys and Questionnaires
Time Factors
Treatment Outcome

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