The Oxford Knee Score: Compared performance before and after knee replacement

详细信息	查看全文 | 推荐本文 |

• 作者：J.-Y. Jenny ; ^{jean-yves.jenny@chru-strasbourg.fr} ; Y. Diesinger
• 关键词：Knee ; Knee replacement arthroplasty ; Outcomes assessment ; Self-assessment ; Patient reported outcome measures
• 刊名：Orthopaedics Traumatology ; Surgery Research
• 出版年：2012
• 期刊代码：P108_18770568
• 类别：med
• 出版时间：June, 2012
• 卷：98
• 期：4
• 页码：409-412
• 文件大小：402 K

摘要

| Figures/TablesFigures/Tables | ReferencesReferences

Summary

Background

Self-administered quality-of-life questionnaires are now crucial to the evaluation of orthopaedic surgical patient-reported outcomes, as they reflect patient satisfaction. The Oxford Knee Score (OKS) is a validated instrument that is widely used to assess outcomes of knee osteoarthritis surgery.

Hypothesis

The relevance of the OKS (comprehension and relevance of the items and responses, and internal and external validity) and its discriminating performance measured based on the ceiling and floor threshold effects are better before than after knee replacement surgery.

Materials and methods

We included 200 patients (100 scheduled for knee replacement and 100 having had knee replacement more than 1 year earlier). The OKS questionnaire was handed to each patient during the first surgeon visit or during a follow-up visit. The American Knee Society (AKS) score was determined simultaneously.

Results

The mean OKS was 43.7 (range, 21-56; SD, 6.9) before surgery and 20.5 (range, 12-45; SD, 5.6) after surgery. The floor effect was absent (0%) before surgery and substantial (33%) after surgery; a weak ceiling effect (7%) was noted before surgery and no ceiling effect after surgery. Internal consistency of the OKS was excellent. The OKS correlated negatively with the AKS knee and functional scores, both before and after surgery.

Discussion

The OKS is well-suited to the evaluation of knee function both before and after knee replacement surgery. Before surgery, the absence of substantial floor and ceiling effects lead to excellent discrimination. After surgery, the substantial floor effect limits the ability to discriminate among the best results. Efforts should be made to develop more demanding scoring systems.

Level of evidence

Level 2. Exploratory cohort study with universally applied reference standards.