Do you need a motion capture lab to measure gait?

Not for most clinical questions. Marker-based laboratory systems remain the reference standard for three-dimensional joint kinematics, but spatiotemporal measures such as walking speed, cadence, stride length, and stance timing can be obtained from timed walk tests, instrumented walkways, body-worn sensors, or camera-based analysis in ordinary space.

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What a laboratory actually buys you

Marker-based optical motion capture is the reference standard for joint kinematics, and it earns that status. If the question requires precise three-dimensional joint angles — particularly outside the sagittal plane, or at the ankle — a laboratory system is still the appropriate instrument.

The cost is structural rather than incidental. Reviews of the method describe it as costly and time-consuming, requiring skilled operators. It needs dedicated space, camera calibration, and correct marker placement on each participant, and it cannot be fitted into an ordinary appointment.

What you can measure without one

QuestionDoes it require a laboratory?
Is the patient walking faster than at the last visit?No. A timed walk test is sufficient.
What are the spatiotemporal parameters of this walk?No. Instrumented walkways, wearables, and camera-based analysis all report these, with published agreement against reference systems described as good to excellent.
Is one limb loaded for less time than the other?No, for stance and support timing. Narrow lateral measures such as step width are less reliable outside a laboratory.
What is the precise three-dimensional knee rotation during stance?Yes, in practice. Frontal and transverse plane kinematics are where non-laboratory methods are weakest.
What are the joint moments and powers during push-off?Yes. This requires force measurement, not only motion.

The measures most outcome work relies on

The functional outcome literature is built largely on spatiotemporal measures. Gait speed alone underpins the sixth vital sign designation, the slowness criterion of the Fried frailty phenotype, and the physical performance threshold in the revised European sarcopenia consensus.

Studies of gait change after degenerative lumbar surgery likewise report their findings in spatiotemporal terms — walking speed, step and stride length and timing, support durations. These are the measures obtainable without a laboratory, which is why the absence of one is rarely the binding constraint on clinical measurement.

The real constraint

The practical limit on measuring movement in routine care is not laboratory access. It is that measurement has to fit inside a visit that is already scheduled, in the space the clinic already has, without adding a staff role.

Where CurveAssure fits

CurveAssure was designed around that constraint. A calibration marker on the floor and a device with a camera are the whole setup — no dedicated room, no marker placement, nothing attached to the patient. A hallway is enough.

This is a different instrument from laboratory motion capture, not a replacement for it. Questions that genuinely require three-dimensional joint kinematics still belong in a laboratory.

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