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Perry Dynamics is revolutionizing the rehabilitation and sports medicine fields with the introduction of the PROPRIO® Reactive Balance System. Never before has one affordable system offered as versatile and effective assessment, measurement, and training of neurologic, orthopedic, or vestibular issues affecting dynamic balance, posture, strength and mobility.

Using state-of-the-art patented technology, the PROPRIO® Reactive Balance Systems benefit the widest range of people – from fragile geriatric patients at risk of falling to NFL and Olympic athletes seeking performance enhancement; from the Army’s wounded soldiers to individuals who have suffered from a stroke or Parkinson’s disease.


We're pleased to announce recognition of the PROPRIO® in assessing and improving postural control in Umphred's classic Neurological Rehabilitation 6th edition. Our revolution has moved into classrooms across the United States.

Like you, we're passionate about helping people achieve their goals in rehab, on the playing field, in everyday life. Finding our website is the first step. Asking us questions is the second. Together, we're going to change peoples' lives.

It is the function of the vestibular system to maintain the trunk in a vertical position for balance on tilted or uneven surfaces when the visual system is not available. The somatosensory system can substitute at both slow and fast speeds, but there is a range in which the vestibular system must provide upright control. Horak et al determined that individuals with vestibular deficiency lost their balance in more than 90% of trials during the 4 deg/s tilt condition, but never fell during slower tils (0.25-1 deg/s) and fell only very rarely during faster tilts (16-32 deg/s). If the somatosensory system is dominant, there is a loss of balance as the trunk and head will follow the direction of the tilt.

(Horak F, Kuzik J, and Hlavack F: Velocity dependence of vestibular information for postural control on tilting surfaces. J Neurophysiol. 2016 Sep 1; 116(3): 1468-1479.)

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Postural Control Test Movements

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