Smith, Toby, Donell, Simon, Clark, Allan, Chester, Rachel, Cross, Jane, Kader, Deiary and Arendt, Elizabeth (2014) The development, validation and internal consistency of the Norwich Patellar Instability (NPI) score. Knee Surgery, Sports Traumatology, Arthroscopy, 22 (2). pp. 324-335. ISSN 0942-2056
Full text not available from this repository. (Request a copy)Abstract
Purpose - No outcome measurements have previously been designed to assess patient-perceived patellar instability. The purposes of this study were to address this limitation and to describe the development and validation of the Norwich Patellar Instability (NPI) scores, a self-administered 19-item questionnaire to assess perceived patellar instability.
Methods - A previous study assessed activities that aggravated symptoms in individuals with patellar dislocation and instability symptoms. These reported activities were ranked in order of severity, and a weighting system was calculated. The NPI score was introduced to routine clinical practice in three institutions. One hundred and two people who had experienced a lateral patellar dislocation completed 102 NPI questionnaires. The completed NPI score was correlated with the Knee injury and Osteoarthritis Outcome Score (KOOS) to evaluate divergent validity and with the J-sign, patellar mobility, apprehension test, Beighton score, Kujala Patellofemoral Disorder Score and Lysholm Knee Score to evaluate convergent validity. Internal consistency of the 19 items was also calculated.
Results - The results indicated a moderate correlation between the NPI score and the Kujala Patellofemoral Disorder Score (rho = −0.66; p < 0.01) and Lysholm Knee Score (rho = −0.54; p = 0.03), suggesting good convergent validity. There was a little correlation between the KOOS and NPI score, indicating divergent validity (rho = −0.02 to −0.17; n.s.). There was high internal consistency (Cronbach’s alpha = 0.93).
Conclusion - These results indicate the NPI score to be a valid tool to assess patellar instability for individuals following patellar dislocation. Further study is now required in order to assess the reliability and responsiveness of this new outcome measure.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Patella, dislocation, instability, outcome measure, construction, validation |
| Subjects: | B900 Others in Subjects allied to Medicine |
| Department: | Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation |
| Depositing User: | Becky Skoyles |
| Date Deposited: | 13 Mar 2014 08:56 |
| Last Modified: | 12 Oct 2019 16:26 |
| URI: | http://nrl.northumbria.ac.uk/id/eprint/15799 |
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