Jean-Francois Esculier1, Thomas Silvini2, Laurent J Bouyer3, Jean-Sébastien Roy4. 1. Faculty of Medicine, Laval University, 1050 Avenue de la Médecine, Quebec City, QC, G1V 0A6, Canada; Centre for Interdisciplinary Research in Rehabilitation and Social Integration, Quebec Rehabilitation Institute, 525 Boulevard Wilfrid-Hamel, Quebec City, QC, G1M 2S8, Canada; The Running Clinic, C.P. 1075, Lac-Beauport, Quebec City, QC, G3B 2J8, Canada. Electronic address: jean-francois.esculier.1@ulaval.ca. 2. Centre for Interdisciplinary Research in Rehabilitation and Social Integration, Quebec Rehabilitation Institute, 525 Boulevard Wilfrid-Hamel, Quebec City, QC, G1M 2S8, Canada. Electronic address: thomas.silvini@yahoo.fr. 3. Faculty of Medicine, Laval University, 1050 Avenue de la Médecine, Quebec City, QC, G1V 0A6, Canada; Centre for Interdisciplinary Research in Rehabilitation and Social Integration, Quebec Rehabilitation Institute, 525 Boulevard Wilfrid-Hamel, Quebec City, QC, G1M 2S8, Canada. Electronic address: laurent.bouyer@rea.ulaval.ca. 4. Faculty of Medicine, Laval University, 1050 Avenue de la Médecine, Quebec City, QC, G1V 0A6, Canada; Centre for Interdisciplinary Research in Rehabilitation and Social Integration, Quebec Rehabilitation Institute, 525 Boulevard Wilfrid-Hamel, Quebec City, QC, G1M 2S8, Canada. Electronic address: jean-sebastien.roy@rea.ulaval.ca.
Abstract
OBJECTIVES: To evaluate, during treadmill running in runners with patellofemoral pain (PFP), the concurrent validity of determining foot strike pattern using 2D video and the intra- and inter-rater reliability of foot strike pattern and step rate assessments between a novice and experienced observer. DESIGN: Methodological study (validity/reliability). SETTING: Motion analysis laboratory. PARTICIPANTS: Sixty runners with PFP (37 females, 23 males; age = 30.8 ± 6.5 years; height = 169.8 ± 9.1 cm; weight = 66.6 ± 12.9 kg). MAIN OUTCOME MEASURES: Running kinematics were recorded using 3D motion capture and a sagittal view 2D video camera. Concurrent validity, intra-, and inter-rater reliability of foot strike pattern determination (Gwet AC statistics), and reliability of step rate calculation (Intraclass correlation coefficients, ICC) were assessed. RESULTS: For foot strike pattern, agreement between the 3D motion analysis system and 2D video assessment was high for both raters (AC = 0.906-0.936, P < 0.001). Excellent intra (AC = 0.961-1.000, ICC = 0.984-0.998, respectively) and inter-rater reliability (AC = 0.929-0.970, ICC = 0.980, respectively) was obtained for foot strike pattern and step rate. CONCLUSIONS: Video-based evaluation of foot strike pattern and step rate of runners with PFP is valid and highly reliable when performed by a novice or experienced assessor. Therefore, clinicians and researchers can use such methods confidently to guide their gait retraining interventions for runners with PFP.
OBJECTIVES: To evaluate, during treadmill running in runners with patellofemoral pain (PFP), the concurrent validity of determining foot strike pattern using 2D video and the intra- and inter-rater reliability of foot strike pattern and step rate assessments between a novice and experienced observer. DESIGN: Methodological study (validity/reliability). SETTING: Motion analysis laboratory. PARTICIPANTS: Sixty runners with PFP (37 females, 23 males; age = 30.8 ± 6.5 years; height = 169.8 ± 9.1 cm; weight = 66.6 ± 12.9 kg). MAIN OUTCOME MEASURES: Running kinematics were recorded using 3D motion capture and a sagittal view 2D video camera. Concurrent validity, intra-, and inter-rater reliability of foot strike pattern determination (Gwet AC statistics), and reliability of step rate calculation (Intraclass correlation coefficients, ICC) were assessed. RESULTS: For foot strike pattern, agreement between the 3D motion analysis system and 2D video assessment was high for both raters (AC = 0.906-0.936, P < 0.001). Excellent intra (AC = 0.961-1.000, ICC = 0.984-0.998, respectively) and inter-rater reliability (AC = 0.929-0.970, ICC = 0.980, respectively) was obtained for foot strike pattern and step rate. CONCLUSIONS: Video-based evaluation of foot strike pattern and step rate of runners with PFP is valid and highly reliable when performed by a novice or experienced assessor. Therefore, clinicians and researchers can use such methods confidently to guide their gait retraining interventions for runners with PFP.
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