Researchers at the University of Michigan Orthotics and Prosthetics center have developed a revolutionary Dynamic Foot Orthosis for the treatment of diabetic foot ulcers.

Foot problems are a major cause of morbidity in individuals with diabetes mellitus. Plantar callous and subsequent ulceration is a common problem in this population. Callous formation, a known precursor to diabetic foot ulceration, results from abnormally high shear and torque forces experienced by the foot during gait.

Traditional foot orthosis is fabricated of multiple layers of soft materials that lose their force absorbing mechanical properties with repeated use. The foot orthosis is static in nature since there are no movable parts or layers.

Dynamic foot orthosis design is based on basic concepts of stress, strain, shear, torsion and its relationship with each other. Dynamic foot orthosis incorporates a "rolling and sliding motion" at the fore foot eliminating shear, friction and torque generated during gait. The orthosis is particularly designed for the treatment of foot ulcers in diabetic neuropathy.

Biomechanics, Features and Benefits:

Traditional foot orthosis
Weight bearing - Heel-off to toe-off
Increased pressure (P=F/A) at distal 1/3rd
Friction significant (µ=F.f/N)
Increased stress (pressure on x sec. Area)
Increased strain (no displacement)
Increased torque (T=F.r)

Dynamic Foot Orthosis
Weight bearing -Heel-off to toe-off
Reduced pressure at distal 1/3rd
Shear and friction eliminated
Stress/strain dissipated
Torque conversion mechanism
Incorporates a rolling and gliding motion

Clinical Application:
Diabetic Neuropathy, Plantar Calluses, Plantar Foot ulcers at distal 1/3rd of foot.

Development Stage:
Prototype has been developed and is currently being tested.

Patent status:
US patent pending.