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dc.contributor.authorGwynne, Craig
dc.contributor.authorCurran, Sarah
dc.identifier.citationGwynne, C.R. and Curran, S.A. (2014) 'Quantifying frontal plane knee motion during single limb squats: Reliability and validity of 2‐dimensional measures', International Journal of Sports Physical Therapy, 9(7), p.898.en_US
dc.descriptionArticle published in International Journal of Sports Physical Therapy available at
dc.description.abstractBackground: Clinical assessment of lower limb kinematics during dynamic tasks may identify individuals who demonstrate abnormal movement patterns that may lead to etiology of exacerbation of knee conditions such as patellofemoral joint (PFJt) pain. Purpose: The purpose of this study was to determine the reliability, validity and associated measurement error of a clinically appropriate two‐dimensional (2‐D) procedure of quantifying frontal plane knee alignment during single limb squats. Methods: Nine female and nine male recreationally active subjects with no history of PFJt pain had frontal plane limb alignment assessed using three‐dimensional (3‐D) motion analysis and digital video cameras (2‐D analysis) while performing single limb squats. The association between 2‐D and 3‐D measures was quantified using Pearson's product correlation coefficients. Intraclass correlation coefficients (ICCs) were determined for within‐ and between‐session reliability of 2‐D data and standard error of measurement (SEM) was used to establish measurement error. Results: Frontal plane limb alignment assessed with 2‐D analysis demonstrated good correlation compared with 3‐D methods (r = 0.64 to 0.78, p < 0.001). Within‐session (0.86) and between‐session ICCs (0.74) demonstrated good reliability for 2‐D measures and SEM scores ranged from 2° to 4°. Conclusion: 2‐D measures have good consistency and may provide a valid measure of lower limb alignment when compared to existing 3‐D methods.en_US
dc.publisherAmerican Physical Therapy Associationen_US
dc.relation.ispartofseriesInternational Journal of Sports Physical Therapy;
dc.subjectPatellofemoral joint painen_US
dc.subjectdynamic knee valgusen_US
dc.subjectfunctional tasksen_US
dc.titleQuantifying frontal plane knee motion during single limb squats: Reliability and validity of 2‐dimensional measuresen_US

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