3D Markerless Motion Scan (3DMMS)

AMA educational material to better understand what a 3DMMS is and how it is used in healthcare.

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Computerized motion analysis allows for the accurate measurement of joint motion in three planes simultaneously.  The patient performs various movements such as bilateral and unilateral squats, forward and side lunges, shoulder abduction, flexion and rotations, which are recorded using frame-synced high-speed cameras located at the front, back and sides. Computer software calculates the location of joint centers and the orientation of each limb segment in space in order to obtain accurate, three-dimensional joint motion data in three planes simultaneously. A computer-generated skeletal model of the subject is created based on the optical video feeds. The model includes vectors to accurately represent major bones and joints. Kinematic and kinetic information is calculated from the resulting vectors including joint angles and ranges of motion at all major joints for the motions performed. A mathematical process known as inverse dynamics is used to calculate the moments and forces acting around each of the major joints. This data is a reflection of the patient's neuromuscular recruitment, strength, mobility, and joint integrity.

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