Indications

Pain


  • Pain experienced during pronation and supination (rotating) of the hand in or near the wrist.
  • Pain in or near the wrist when lifting objects.
  • Pain resulting from pressure on the radius and ulna created by contact in areas with no cartilage during inactivity such as sleep.

Loss of motion (pronation/supination)


Inability to lift


Previous injury


  • Distal Radius Fracture
  • Distal Ulnar Fracture
  • Distal Radius Fracture AND Distal Ulnar Fracture
  • Severe dislocations with cartilage damage
  • Injuries to the Distal Radioulnar Joint or its supporting structures that lead to irreversible damage to the joint lining (loss of cartilage)
  • Wrist fractures (distal radius / distal ulna)
  • Ligament tears causing a misalignment of the joint surfaces
  • Arthritis that lead to a loss of cartilage
  • Any other injury or surgery that resulted in bone to bone pinching or contact

Tumors at the end of the Ulna


Congenital Abnormalities of the Distal Radioulnar Joint (i.e. Ehrlers-Danlos Syndrome and Madelung's Deformity)



How Aptis Can Help


Before APTIS, injury to the Distal Radioulnar Joint left patients with impaired abilities.  Not only did patients suffer a loss of mobility, but they also had to contend with serious pain while trying to perform simple tasks like turning a door knob, lifting a gallon of milk, or even sleeping.

This pain results from a loss of the unique function of the Distal Radioulnar Joint.  Without an intact DRUJ to act as a pivot point, the radius and ulna pinch together when any force is applied to the wrist.  The most common solution up to now had been to cut off part of the distal ulna.  While this sometimes alleviated pain, patients still had very little functionality left in the affected forearm.  Since the radius and ulna no longer worked in their designed conjunction, the forearm had very little ability to perform any turning or twisting motion.  Lifting anything of significance was practically out of the question.

APTIS has changed treatment of the joint as the DRUJ prosthesis recreates its complex and unique function, allowing the radius and ulna to pivot as they are intended.  By performing this function, the APTIS prosthesis alleviates the pain previously associated with DRUJ damage or removal while still allowing the patient to use the forearm for lifting and turning.  This is something that is not possible with joint removal.

The APTIS prosthesis substitutes the organic DRUJ by way of a mechanical device that uses two pieces of Cobalt Chromium to enclose a polymer ball (UHMWP - Ultra High Molecular Weight Polymer).  The polymer ball becomes the pivot point, allowing the prosthesis to perform a full range of movement while providing shock absorption.

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