A total wrist replacement implant consists of:

• An ellipsoid head, which simulates the curvature of the patient's natural joint to allow for a functional range of motion, allowing the patient to flex and extend the wrist and move it side-to-side.
• An offset radial stem. This stem anchors the implant in your forearm. The special shape of this component is designed to enhance the function of the tendons used to extend the wrist and to produce optimum stability of the implant, which is crucial to long-term success.
• An elongated radial tray surface with a molded bearing made of plastic (polyethylene). This component is crucial to "load sharing," distributing forces over the entire surface of the implant. Load sharing is vital to the success of orthopaedic implants.
• A trapezoid fixation stem. This component is secured to the patient's bone to add stability as well as eliminating rotation of the implant within the bone.
  A curved metacarpal stem. This component is shaped to accommodate the natural curvature of the medullary canal to secure the wrist implant within the hand.