Thumb CMC Arthroplasty
Thumb carpometacarpal (CMC) arthritis is a common cause of pain at the base of the thumb. It can make everyday activities difficult, including gripping, pinching, opening jars, writing, using tools and turning keys. When symptoms remain troublesome despite splints, hand therapy, injections or activity modification, surgery may be considered.
Traditional and Modern Surgical Options
Traditionally, one of the most common operations for advanced basal thumb arthritis has been trapeziectomy, where the arthritic trapezium bone is removed. This remains a reliable and well-established procedure.
More recently, thumb CMC joint replacement, or CMC arthroplasty, has become available in Australia. Although newer locally, this type of procedure has been used in Europe for more than a decade and is now a well-recognised option in appropriately selected patients.
Potential Benefits of CMC Arthroplasty
Dr Ye performs thumb CMC arthroplasty for suitable patients with basal thumb arthritis. This procedure replaces the worn joint with an implant, aiming to relieve pain while preserving thumb length, strength and movement.
Compared with trapeziectomy, potential advantages include a quicker functional recovery, less need for prolonged hand therapy, better early grip and pinch strength, preservation of thumb length and improved range of motion.
For active patients, particularly those who need to return to work or daily function sooner, these differences can be important.
Patient Selection and Long-Term Outcomes
As with any joint replacement, patient selection and surgical technique are critical. In the right patient, modern CMC implants have shown very good medium-term survivorship, high satisfaction rates and reliable pain relief.
Possible complications include dislocation, loosening, implant wear, polyethylene wear and the need for revision surgery, although current-generation implants have shown encouraging results beyond five years in experienced hands.
Training and Surgical Expertise
Dr Ye has undertaken specific training in thumb CMC arthroplasty, including operating with and observing highly experienced surgeons from Switzerland and France, where many of these techniques and implants have been developed and refined.
These visits have provided detailed technical insight into the nuances of implant positioning, soft tissue balancing and patient selection, all of which are important to achieving a good outcome.
Future of CMC Arthroplasty in Australia
CMC arthroplasty is expected to become more widely available in Australia, with rebate arrangements anticipated from July 2026. If Australian experience follows the European and North American trend, it is likely to become an increasingly important option for the treatment of advanced basal thumb arthritis.