Gait & posture · 2025
Agreement of 3D motion capture and long-leg radiography for the determination of leg length discrepancy and frontal plane knee axis alignment.
СтатьяСравнительное исследованиеНазвание и аннотация: Перевод в очереди
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Dobler Florian, Schwizer Rahel, Alexander Nathalie
Аннотация
BACKGROUND: 3D motion capture has been identified as a feasible non-invasive alternative to radiography for assessing leg length discrepancy (LLD) and frontal plane knee axis alignment (KA). However, factors like body mass index (BMI) and torsional deformities could influence the validity of measurements. The aim of the present study was to compare long-leg radiography (LLR) measurements of LLD and KA with assessments obtained from 3D motion capture, while also accounting for the influence of BMI and torsional deformities.
METHODS: Data of 80 patients who underwent 3D gait analysis (3DGA) and LLR were analyzed retrospectively. Torsional profiles, namely femoral anteversion and tibial torsion, from computed-tomography were available for 30 patients. KA and LLD were determined in a standing posture in 3DGA and LLR. Patients were categorized as normal-weight (n = 52) or overweight (n = 28). Agreement between 3DGA and LLR was evaluated using Pearson correlation coefficients, intraclass correlation coefficients, and Bland-Altmann analysis bias and limits of agreement (LoA). The relationship between femoral anteversion and tibial torsion and KA differences was analyzed with Pearson correlation coefficients.
RESULTS: Despite moderate-to-strong correlations, the Bland-Altman analysis revealed wide LoA for KA (±2.8°) and LLD (±11.8 mm) in normal-weight patients. Results for overweight patients were similar. Torsional deformities had no influence on the agreement between 3DGA and LLR in KA measurements.
SIGNIFICANCE: The present study indicates that 3DGA shows insufficient agreement with LLR in measuring KA and LLD for use as a single clinical tool in individual patient assessments. Nonetheless, for population-level studies and non-invasive group analyses, 3DGA remains a valid and practical tool.
METHODS: Data of 80 patients who underwent 3D gait analysis (3DGA) and LLR were analyzed retrospectively. Torsional profiles, namely femoral anteversion and tibial torsion, from computed-tomography were available for 30 patients. KA and LLD were determined in a standing posture in 3DGA and LLR. Patients were categorized as normal-weight (n = 52) or overweight (n = 28). Agreement between 3DGA and LLR was evaluated using Pearson correlation coefficients, intraclass correlation coefficients, and Bland-Altmann analysis bias and limits of agreement (LoA). The relationship between femoral anteversion and tibial torsion and KA differences was analyzed with Pearson correlation coefficients.
RESULTS: Despite moderate-to-strong correlations, the Bland-Altman analysis revealed wide LoA for KA (±2.8°) and LLD (±11.8 mm) in normal-weight patients. Results for overweight patients were similar. Torsional deformities had no influence on the agreement between 3DGA and LLR in KA measurements.
SIGNIFICANCE: The present study indicates that 3DGA shows insufficient agreement with LLR in measuring KA and LLD for use as a single clinical tool in individual patient assessments. Nonetheless, for population-level studies and non-invasive group analyses, 3DGA remains a valid and practical tool.