The Norwich Patellar Instability Score: Validity, internal consistency and responsiveness for people conservatively-managed following first-time patellar dislocation

The Knee
Toby O SmithSimon T Donell

Abstract

This paper assessed the validity, internal consistency, responsiveness and floor-ceiling effects of the Norwich Patellar Instability (NPI) Score for a cohort of conservatively managed people following first-time patellar dislocation (FTPD). Fifty patients were recruited, providing 130 completed datasets over 12 months. The NPI Score, Lysholm Knee Score, Tegner Level of Activity Score and isometric knee extension strength were assessed at baseline, six weeks, six and 12 months post-injury. There was high convergent validity with a statistically significant correlation between the NPI Score and the Lysholm Knee Score (p<0.001), Tegner Level of Activity Score (p<0.001) and isometric knee extension strength (p<0.002). Principal component analysis revealed that the NPI Score demonstrated good concurrent validity with four components account for 70.4% of the variability. Whilst the NPI Score demonstrated a flooring-effect for 13 of the 19 items, no ceiling effect was reported. There was high internal consistency with a Cronbach Alpha value of 0.93 (95% CI: 0.91 to 0.93). The NPI Score was responsive to change over the 12 months period with an effect size of 1.04 from baseline to 12 months post-injury. The NPI Score is a valid tool to...Continue Reading

References

Sep 1, 1985·Clinical Orthopaedics and Related Research·Y Tegner, J Lysholm
May 1, 1982·The American Journal of Sports Medicine·J Lysholm, J Gillquist
Jan 1, 1993·Arthroscopy : the Journal of Arthroscopic & Related Surgery : Official Publication of the Arthroscopy Association of North America and the International Arthroscopy Association·U M KujalaO Nelimarkka
May 4, 2005·The Journal of Bone and Joint Surgery. American Volume·Dorcas E BeatonUNKNOWN Upper Extremity Collaborative Group
May 17, 2011·International Journal of Medical Informatics·Paraskevas VezyridisHeather Wharrad
Jan 12, 2013·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Toby O SmithElizabeth A Arendt
Mar 19, 2013·Health and Quality of Life Outcomes·Franco M ImpellizzeriAlessandro Sartorio
May 8, 2013·The American Journal of Sports Medicine·Laurie A HiemstraNicholas G H Mohtadi

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Citations

Mar 6, 2019·Current Reviews in Musculoskeletal Medicine·Laurie Anne HiemstraSarah Kerslake
Mar 19, 2020·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·David C FlaniganRobert A Magnussen
Jun 17, 2021·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Justin A MagnusonAustin V Stone

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