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

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

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)324-335
Number of pages12
JournalKnee Surgery, Sports Traumatology, Arthroscopy
Issue number2
Publication statusPublished - Feb 2014

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