Thumb joint replacement: Restoring function and relieving pain

Thumb joint replacement, also known as thumb carpometacarpal (CMC) arthroplasty, is a surgical procedure designed to relieve pain and restore function in patients suffering from severe arthritis at the base of the thumb. The condition most commonly affecting this joint is osteoarthritis, a degenerative disorder that gradually wears away cartilage, leading to pain, stiffness, and reduced mobility.

The thumb’s CMC joint plays a crucial role in grip strength and fine motor skills. Everyday tasks such as turning a key, opening jars, or writing can become difficult when arthritis progresses. When conservative treatments—such as splints, anti-inflammatory medications, corticosteroid injections, and physical therapy—no longer provide relief, thumb joint replacement may be considered.

During the procedure, the damaged bone surfaces are removed and replaced with an artificial implant made of metal, plastic, or a combination of materials. In some cases, surgeons perform a variation called trapeziectomy with ligament reconstruction and tendon interposition (LRTI), where the arthritic bone (the trapezium) is removed and replaced with a rolled tendon to stabilise the joint.

Recovery typically involves a period of immobilisation in a cast or splint, followed by hand therapy to restore strength and flexibility. Most patients experience significant pain relief and improved hand function within a few months. Full recovery can take three to six months, depending on individual healing and adherence to rehabilitation.

As with any surgical procedure, thumb joint replacement carries risks, including infection, implant loosening, or nerve injury. However, advances in surgical techniques and implant design have improved long-term outcomes.

For individuals with persistent thumb pain that interferes with daily life, thumb joint replacement offers a highly effective solution, helping patients regain independence and improve overall quality of life.