WristMotion Lunate Arthroplasty System

The WristMotion Lunate Arthroplasty System restores mobility and recreates your natural anatomy. The WristMotion System is performed in conjunction with a PRC (Proximal Row Carpectomy).

It is the only implant designed to create a new, mobile wrist joint by matching the shapes and contours of the patients’ existing joint surfaces. The dual curved implant is placed into the capitate bone (main bone in the middle of the hand) and creates a smooth articulation with the socket of the radial bone (the large wrist bone in the forearm).

The wrist is a complex joint with many small “ball and socket” joints that move against each other. When the wrist becomes arthritic or the cartilage is damaged, pain and function between the different bones can severely limit activity and grip strength. The two most common procedures are a Proximal Row Carpectomy (PRC) or a 4 corner fusion. The fusion procedure is straightforward. The goal is to immobilize the bones in the hand thereby eliminating the pain caused by motion. However, it will affect the normal function and movement of the wrist joint.  A PRC consists of removing the row of small damaged bones closest to the forearm so that the arthritic and painful elements are taken out. The hand bones naturally realign themselves so that the wrist can move normally and pain free again. The limitation with a PRC surgery is that it’s only indicated for a very narrow group of patients, namely, those where the damage or arthritis is limited to the bones in the proximal row. Patients tend to prefer the ability to move their wrist so Arthrosurface designed the WristMotion implant to resurface the main bone in the second row allowing more patients to get a motion preserving PRC procedure. According to the literature, 4 Corner Fusions have a larger number of associated complications which is another reason that a PRC procedure is more attractive. By using a HemiCAP implant to recreate a new functional joint the patients can now maintain their motion and stay active.

How is the WristMotion® different from existing devices?

The WristMotion Lunate Arthroplasty System is:

  • Motion Preserving
  • Excellent fixation
  • Minimal hardware as it is only 2 pieces(Cap & Screw)
  • Less Invasive
  • Shortened Recovery Time
  • Implants are matched to fit to a patients’ joint contours
  • Significantly less cartilage and bone is removed than traditional joint replacements
  • Joint motion and grip strength are maintained

Other procedures such as a Wrist Fusion (4-Corner Fusion) and Total Wrist Replacements significantly restrict motion and require multiple pieces of hardware to be implanted into your joint. Total Wrist Replacements are also known to loosen inside of the joint, causing pain, discomfort and resulting in a failed surgery. Once an implant fails, a revision surgery is necessary.

Am I a Candidate?

If you have been diagnosed with or are experiencing any of the following, you may be a candidate for the HemiCAP Wrist™:

  • SLAC Wrist
  • SNAC Wrist
  • Instability that causes advanced arthritis in the wrist.
  • Dislocation of the joint
  • Reduced Grip Strength
  • Weakness in the wrist
  • Kienbock disease – AKA Avascular Necrosis, Bone Death
  • Painful and Stiff Wrist Joint
  • Arthritis

*Seek professional medical advice for specific personal care.

Surgery and Recovery Expectations

wrist fusion Patients report outstanding pain relief, rapid recovery times and significant range of motion improvements in multi-center studies and the procedure may be performed on outpatient basis.

Every surgery has risks and your prospects for a safe and successful surgery must be evaluated with your surgeon. If you are affected by osteonecrosis or cartilage damage caused by a previous injury, a successful joint restoration procedure may significantly improve your quality of life by reducing pain and restoring function. Many patients return to full activity after rehabilitation and go back to doing things that they had given up on in the years before surgery.

After the surgical repair of a joint, your surgeon will provide you with specific post-operative instructions which you need to follow carefully. Post-operative rehabilitation recommendations will vary depending on the invasiveness of your surgery and your individual recovery patterns.  The immediate focus in all surgeries will be on swelling and pain management.  In some cases you may wear a brace for a few weeks and will be prescribed exercises and activities to strengthen your muscles.

Here are a few helpful suggestions as you recover and rehabilitate from your surgery:

  • Follow the recommendations of your surgeon and physical therapist.wrist fusion alternatives
  • Keep a log to track your progress as you recover and increase activity.
  • Ask for assistance from family and friends to help with chores and errands during your recovery.
  • Wear loose, comfortable clothing during your recovery period.
  • Eliminate possible tripping hazards in your home – wires, cables, rugs, etc.
  • Return to any moderate or demanding activities should be guided by your tolerance for weight bearing.

NEWs / updates / blog


  • Quick Facts

    • No activity restrictions provides an active alternative to joint replacement.
    • HemiCAP® Implants are custom matched and fit to a patient’s joint size and shape.
    • Significantly less cartilage and bone is removed than traditional total joint replacements.
    • It is placed into the bone rather than on top, restoring the joints natural anatomy.
    • Allows patients to retain their active lifestyles.
    • The Wrist HemiCAP is a great alternative to a Four Corner Fusion.
    • If you have been diagnosed with SNAC or SLAC wrist, the Wrist HemiCAP could be the right option for you.
    • Stay Active with the Arthrosurface HemiCAP®
    • The Wrist HemiCAP has a shorter recovery time than other procedures and gets you back to work quicker.
    • Inlay Implants are inherently more stable than onlay implants. No Reported Loosening.
    • Significantly less hardware than traditional wrist replacements
    • A great way to avoid a Wrist Fusion is to choose the Wrist HemiCAPITATE