Why is 3D motion capture used in gait analysis?

Small reflective markers or other tracking tools are placed on selected points of the body. Cameras record their movement while you walk, jog, or perform a task. Software then maps joint motion in three dimensions, allowing the clinician to review angles, timing, step symmetry, pelvic movement, and the path of the feet and knees.

This information adds detail to a hands-on examination and video review. It can help connect a movement pattern with pain, reduced balance, weakness, a previous injury, or difficulty using a prosthesis or orthosis. The result is a measurement-based picture of movement, not a diagnosis on its own; your symptoms, examination, medical history, and other tests still matter.

Wear comfortable clothing that allows the clinician to see and place markers around the legs and trunk, along with the footwear you normally use for the activity being assessed. Tell the team about pain, recent surgery, falls, walking aids, braces, or changes in your usual walking pattern.

During the session, follow the requested pace and repeat the movement naturally. You may be asked to walk several passes so the team can compare comfortable movement with a specific task. Speak up if pain increases, you feel unsteady, or you need a rest. Ask how the findings will change your exercise plan, footwear advice, brace settings, or follow-up.

Arrange a clinical assessment if a new or worsening change in walking is affecting daily activities, if pain persists, or if you are repeatedly losing balance. Seek urgent medical help for sudden inability to walk, new one-sided weakness or numbness, a serious injury with severe pain or deformity, or loss of bladder or bowel control with back or leg symptoms.

A gait analysis appointment is not a substitute for urgent care when these warning signs are present. A clinician can decide whether motion capture is appropriate after checking your strength, sensation, joints, and walking safety.

Ask: What movement are you assessing? Could my pain or weakness affect the results? Should I bring my usual shoes, brace, or walking aid? Which findings will guide treatment? Will I receive a written explanation or exercise plan?