Physical Medicine and Rehabilitation Department Cotonou, National University Hospital of Cotonou, Cotonou, Benin.
Neuro-musculoskeletal Lab (NMSK), Secteur des Sciences de la Santé, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain, Avenue Mounier 53, B1.53.07, 1200, Brussels, Belgium.
Knee Surg Sports Traumatol Arthrosc. 2019 Jun;27(6):1984-1991. doi: 10.1007/s00167-018-5109-x. Epub 2018 Aug 21.
The purpose of this study was to test the hypothesis that the "Forgotten Joint Score" (FJS-12) is a unidimensional interval-level scale. Unidimensionality refers to measuring a single attribute, i.e., the single ability to forget the arthroplasty. If this property is not verified, the interpretation of the score can be confusing. Unidimensionality is an essential prerequisite of construct validity and required if FJS-12 response data are to be validly summated into a single score. Interval-level dimension is an essential prerequisite of the parametric statistics. Rasch analysis was used to test our study hypothesis.
The FJS-12 questionnaire was validated in 248 unilateral knee arthroplasty patients. Successive analyses were used to select items with good psychometric qualities to constitute the new "FJS". The external validity was assessed with the KUJALA questionnaire.
Quantity of relevant items was greater than 50%. Of the 12 original items, nine showed disturbed thresholds, indicating that patients were unable to discriminate among the five levels for these items. The data set was reanalyzed using a four-level scale. The new analysis indicated that the internal consistency was good (r = 0.84). Three items did not fit with the model and they were removed. The nine items of the final scale defined a unidimensional and linear measure of the forgotten joint, and showed a continuous progression in their difficulty. The perception of difficulty was group-independent. The correlation coefficient was moderate between FJS and KUJALA score (r = 0.4).
This new and items reduced FJS can be used in clinical practice with good psychometric qualities. It provides a reliable tool to follow up patient's evolution and document changes related to knee arthroplasty. This valid FJS is needed in evaluating patients' assessment, one indicator of quality of care.
III-Therapeutic.
本研究旨在验证“遗忘关节评分（FJS-12）是否为一维区间量表”这一假设。所谓一维性是指测量单一属性，即评估患者对关节置换的遗忘能力。如果这一特性未经证实，那么对评分的解读可能会令人困惑。一维性是构建效度的基本前提，如果要使 FJS-12 的评分数据能够有效地加总为单一分数，则必须满足这一前提。区间尺度是参数统计的基本前提。本研究采用 Rasch 分析来检验我们的研究假设。
我们对 248 例单侧膝关节置换患者进行了 FJS-12 问卷的验证。通过连续分析，选择具有良好心理测量特性的项目来构成新的“FJS”。采用 KUJALA 问卷评估其外部效度。
相关项目的数量大于 50%。12 个原始项目中，有 9 个项目的阈值存在紊乱，表明患者无法区分这 9 个项目的五个水平。使用四级量表对数据集进行重新分析。新的分析表明，内部一致性良好（r=0.84）。有 3 个项目不符合模型，因此被剔除。最终量表的 9 个项目定义了一个被遗忘关节的单一、线性测量指标，且表现出难度的连续进展。对难度的感知与组别无关。FJS 与 KUJALA 评分的相关系数适中（r=0.4）。
这种新的简化版 FJS 具有良好的心理测量特性，可在临床实践中使用。它为随访患者的病情演变和记录与膝关节置换相关的变化提供了可靠的工具。在评估患者的评估中，这一有效的 FJS 是评估护理质量的一个指标。
III-治疗性。
