The Danniflex 400i is a popular CPM used for the rehabilitation of the lower limb. It is constructed of durable tubular steel and plastic. The patient's leg is strapped into the device, and the unit then moves the leg back and forth in a slow, controlled, continuous pattern to flex and extend the muscle tissue. Adjustable to most adult limb lengths, and an optional pediatric extension can be substituted for smaller patients. Weighs 24 lb., can be folded up and carried by integral handle. Hand-held, user-friendly control panel with settings for extension, flexion, and speed. Also available is the Danniflex 450, which is identical to the Danniflex 400i except the analog hand-held control pendant has been replaced by one with digital push-button controls and an LCD display. Orthologic has discontinued manufacture of both items in favor of the newer Danniflex 460, but both the 400i and the 450 continue to be available on the used market.