1 Centre for Health Services and Policy Research, School of Population and Public Health, University of British Columbia, Vancouver, BC, Canada.
2 Department of Orthopaedics, University of British Columbia, Vancouver, BC, Canada.
Foot Ankle Int. 2019 Apr;40(4):422-429. doi: 10.1177/1071100718818573. Epub 2019 Jan 10.
: Significant ankle arthritis results in functional limitations and patient morbidity. There is a need to measure symptoms and the impact of interventions on patient's quality of life using valid and reliable patient-reported measurement instruments. The objective of this research was to validate the Ankle Osteoarthritis Scale instrument in the preoperative setting using factor analysis, item response theory, and differential item function methods.
: This research is based on secondary analysis of patients scheduled for ankle arthrodesis or total ankle replacement in Vancouver, Canada. Participants completed the instrument between September 2014 and August 2017. Item response theory was used to estimate item difficulty and discrimination parameters, controlling for study participants' underlying level of ankle function. Differential item function was examined for sex, age group, and surgery. There were 88 participants.
: Modification indices suggested that item 10, "walking around the house," would better fit the pain domain rather than the disability domain. Items in the pain domain displayed a range of discrimination and difficulty. Items in the disability domain exhibited a range of discrimination, though the disability domain had low difficulty. Differential item functioning for sex, age group, and ankle arthrodesis or total ankle replacement appeared to be ignorable.
: This evaluation of the Ankle Osteoarthritis Scale found the instrument to be a strong measure of the effect of pain and dysfunction among patients with end-stage ankle arthritis, even when removing items 7 and 8, supporting its prior use in numerous clinical studies.
: Level II, prospective comparative study.
严重的踝关节关节炎会导致功能受限和患者发病。需要使用有效且可靠的患者报告测量工具来测量症状以及干预措施对患者生活质量的影响。本研究的目的是使用因子分析、项目反应理论和差异项目功能方法在术前环境中验证踝关节骨关节炎量表。
本研究基于加拿大温哥华踝关节融合术或全踝关节置换术患者的二次分析。参与者于 2014 年 9 月至 2017 年 8 月期间完成了该量表。项目反应理论用于估计项目难度和辨别参数，同时控制研究参与者的踝关节功能的潜在水平。差异项目功能检查了性别、年龄组和手术。共 88 名参与者。
修正指标表明，第 10 项“在房子周围走动”将更适合疼痛域，而不是残疾域。疼痛域的项目显示出不同的辨别力和难度范围。残疾域的项目显示出不同的辨别力，但残疾域的难度较低。性别、年龄组和踝关节融合术或全踝关节置换术的差异项目功能似乎可以忽略不计。
本踝关节骨关节炎量表评估发现，即使删除第 7 项和第 8 项，该量表也是评估晚期踝关节关节炎患者疼痛和功能障碍的有力工具，支持其在众多临床研究中的先前使用。
II 级，前瞻性比较研究。
