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Knee Surgery, Sports Traumatology, Arthroscopy
Erschienen in: Knee Surgery, Sports Traumatology, Arthroscopy 2/2014

01.02.2014 | Knee

The development, validation and internal consistency of the Norwich Patellar Instability (NPI) score

verfasst von: Toby O. Smith, Simon T. Donell, Allan Clark, Rachel Chester, Jane Cross, Deiary F. Kader, Elizabeth A. Arendt

Erschienen in: Knee Surgery, Sports Traumatology, Arthroscopy | Ausgabe 2/2014

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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.

Level of evidence

III.
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Metadaten
Titel
The development, validation and internal consistency of the Norwich Patellar Instability (NPI) score
verfasst von
Toby O. Smith
Simon T. Donell
Allan Clark
Rachel Chester
Jane Cross
Deiary F. Kader
Elizabeth A. Arendt
Publikationsdatum
01.02.2014
Verlag
Springer Berlin Heidelberg
Erschienen in
Knee Surgery, Sports Traumatology, Arthroscopy / Ausgabe 2/2014
Print ISSN: 0942-2056
Elektronische ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-012-2359-x

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