Vertical Video-based Gait Analysis for Assessment of Transverse Plane Motion: Reliability and Validity in a Neuromuscular Population.

Background: In the absence of 3-dimensional gait analysis (3DGA), assessment of transverse plane motion of the lower extremity from sagittal and coronal video has a high degree of error. We propose a standardized method through vertical video-based gait analysis (VVGA) to assess the position of the pelvis and lower extremity in the transversal plane. This study aims to evaluate the reliability and accuracy of VVGA compared with 3DGA for transverse plane kinematics.