Hysing-Dahl T, Faleide A G, Magnussen L H, Inderhaug E
Department of Surgery Haraldsplass Deaconess Hospital Bergen Norway.
Sports Traumatology and Arthroscopy Research Group (STAR Group), Department of Clinical Medicine University of Bergen Bergen Norway.
J Exp Orthop. 2025 Jan 10;12(1):e70095. doi: 10.1002/jeo2.70095. eCollection 2025 Jan.
To translate and adapt the Norwich Patellar Instability (NPI) score into Norwegian, and second, to examine the psychometric properties of the Norwegian version (NPI-No).
NPI was translated according to international guidelines. A cohort of 107 patients surgically treated for recurrent patellofemoral instability completed NPI-No, related questionnaires and functional tests prior to and six months post-surgery. Validity (face, content and construct validity), internal consistency (Cronbach's alpha []), test-retest reliability (intraclass correlation coefficient [ICC]], measurement error (standard error of measurement [SEM] and smallest detectable change at individual [SDC] and group level [SDC]) and construct validity (hypotheses testing; independent tests, Pearson's ) were examined.
NPI-No had good face and content validity. Internal consistency was satisfactory ( = 0.88), test-retest reliability was moderate ICC 0.65 (95% confidence interval = 0.47-0.77) and measurement error low (SEM = 7.8). SDC was 21.7 points and SDC was 2.8. Seven of the 10 hypotheses about construct validity were confirmed. While there was no ceiling effect pre- or post-operatively, a substantial floor effect (28%) was observed at the 6-month follow-up.
The NPI-No is valid for assessment of self-perceived patellar instability before and after surgery in Norwegian patients. However, reproducibility was found to be only moderate. This study adds further knowledge about the measurement properties of the NPI.
Level II.
将诺维奇髌骨不稳定（NPI）评分翻译成挪威语并进行改编，其次，检验挪威语版本（NPI-No）的心理测量特性。
根据国际指南对NPI进行翻译。一组107例因复发性髌股关节不稳定接受手术治疗的患者在手术前和术后6个月完成了NPI-No、相关问卷和功能测试。检验了效度（表面效度、内容效度和结构效度）、内部一致性（克朗巴哈系数[]）、重测信度（组内相关系数[ICC]）、测量误差（测量标准误差[SEM]以及个体和组水平的最小可检测变化[SDC]）和结构效度（假设检验；独立检验、皮尔逊检验）。
NPI-No具有良好的表面效度和内容效度。内部一致性令人满意（=0.88），重测信度中等（ICC 0.65，95%置信区间=0.47-0.77），测量误差较低（SEM=7.8）。个体SDC为21.7分，组水平SDC为2.8分。关于结构效度的10个假设中有7个得到证实。术前和术后均无天花板效应，但在6个月随访时观察到显著的地板效应（28%）。
NPI-No对于评估挪威患者手术前后自我感知的髌骨不稳定是有效的。然而，发现其再现性仅为中等。本研究进一步增加了关于NPI测量特性的知识。
二级。
