Before APTIS, injury to the Distal Radial Ulna Joint left patients with impaired wrist abilities. Not only did patients suffer a loss of mobility, they also had to contend with serious pain while trying to perform even simple tasks, like turning a door knob or lifting a gallon of milk, or even while sleeping.
This pain results from a loss of the unique function of the Distal Radial Ulna Joint. Without the Distal Radial Ulna Joint to act as a pivot, the radius and ulna would pinch together when any force was applied to the wrist. The most common solution up to now was to cut off part of the distal ulna. And while this alleviated pain, patients still had very little functionality left in the affected wrist. Since the radius and ulna couldn't work in perfect conjunction, the wrist had very little ability to perform any turning or twisting motion. And lifting anything was practically out of the question.
With the APTIS prosthesis in place, the organic Distal Radial Ulna Joint is replaced by a mechanical device that uses two pieces of cobalt chromium that pivot at an enclosed polymer ball (UHMWP - Ultra High Molecular Weight Polymer). The polymer ball allows the prosthesis to perform a full range of movement, while exhibiting virtually any wear.