FlexiGait provides AI-powered, markerless gait analysis using single-camera RGB video, delivering lab-grade insights without the need for expensive equipment.
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Position the camera sideways at hip height.
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Wear tight clothes; keep the view clear.
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Record 1 min in good lighting.
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Upload recordings through the FlexiGait clinician portal.
FlexiGait report provides detailed gait analysis, including muscle activation, joint angles, and gait parameters for both left and right legs.
FlexiGait was compared against a Vicon marker-based motion capture reference in 31 participants from the public GPJATK dataset. Mean absolute error for joint kinematics was below 5°. Agreement was excellent for stride time (ICC = 0.97) and cadence (ICC = 0.96), and moderate for swing phase (ICC = 0.72). Bland–Altman analysis showed minimal bias, with a mean difference of approximately 0.01 s for step time. These results were obtained in healthy adults recorded in a laboratory setting; performance has not been established in any patient population. The study was carried out with Prof. Ali Kiapour and Prof. Santiago A. Lozano Calderon. Results were presented at the GAMMA Congress 2025 and the congress abstract is published as Safarzadeh O, FlexiGait: 3D Markerless Gait Analysis using single camera RGB videos, Gait & Posture 2025;117(Suppl 1):S29, doi:10.1016/j.gaitpost.2025.01.073. The full manuscript is available as a preprint on SSRN and has not yet completed peer review. The named investigators contributed in their individual capacity. The views represented are not official ones of Harvard University, Harvard Medical School, Massachusetts General Hospital, or any of their units or officers, and nothing here constitutes endorsement of FlexiTrace or its products by any institution.
"I like it for its ongoing development and the regular updates. I highly recommend it, and I'm sure it will become one of the best video analysis apps in the future. Congratulations on your work!," says Prof. Javier Martinez Gramage.
"Advanced gait analysis has been very useful for assessing clients and monitoring training progress, in addition to postural aspects." says Prof. Vitor Bertoli Nascimento.
"FlexiGait gives me objective numbers on how my athletes move, which I use alongside my own coaching assessment," says Mike, a fitness coach.
"FlexiGait optimized my stride and sped up my injury recovery," says Sarah, a marathon runner.
"FlexiGait helped me track my knee recovery and avoid re-injury," says Tom, a fitness enthusiast.
FlexiTrace Offers AI-powered Gait and Posture Analysis
