Upper Limb · 4 min read
Thumb Base Arthritis: Restoring Independence Through Thoughtful Management
Basal thumb arthritis — carpometacarpal osteoarthritis — is among the most functionally impactful conditions in hand surgery. It affects a joint that is involved in almost every act of pinch and grip. When it is severe, the activities that define daily independence — unscrewing a lid, turning a key, writing, dressing — become painful and effortful. The good news is that both conservative and surgical management produce outcomes that genuinely restore function.
The carpometacarpal joint of the thumb — the basal joint, or the trapeziometacarpal joint — is a saddle-shaped articulation designed for the extraordinary range of motion that makes human hand function unique among primates. It is precisely this remarkable mobility — achieved through joint geometry rather than bony constraint — that makes it vulnerable to degenerative change. Basal thumb osteoarthritis is estimated to affect up to 15% of postmenopausal women and a significant proportion of older men, making it one of the most prevalent articular conditions in the upper limb.
Conservative management: effective and underutilised
The conservative management of basal thumb arthritis is more effective than its underutilisation in clinical practice suggests. Thumb spica splinting — particularly at night, to rest the inflamed joint during the hours when it cannot be protected by voluntary muscle activation — reduces pain and inflammatory symptoms reliably in early to moderate disease. Physiotherapy focused on thenar musculature strengthening and joint stabilisation — building the dynamic stability that the degenerating joint progressively loses — produces durable functional improvement in well-conducted programmes.
Corticosteroid injection into the carpometacarpal joint, performed under image guidance, provides short to medium-term pain relief that allows physiotherapy to be pursued more effectively. The evidence for hyaluronic acid injection is more equivocal. The evidence for newer biological approaches — PRP at the basal joint — is early but biologically rational and the subject of ongoing investigation.
The surgical options: a genuine menu of choices
When surgery is indicated — in patients with severe, unremitting symptoms that have failed adequate conservative management — the options are broader than many patients appreciate. Trapeziectomy — removal of the trapezium bone — with or without ligament reconstruction and tendon interposition remains the most widely performed and most extensively evidenced procedure, with long-term follow-up data demonstrating durable pain relief and functional improvement. Total joint replacement of the basal thumb, while less mature in its evidence base than hip or knee arthroplasty, has advanced significantly in the past decade with newer implant designs producing encouraging medium-term outcomes in carefully selected patients.
The patient whose hand pain has quietly reshaped their independence — who has stopped doing the things they love because their thumb makes them too difficult — often does not realise how much can be restored. That restoration is one of hand surgery's most rewarding gifts.
The post-operative rehabilitation after basal thumb surgery is extensive and requires patient commitment: the immobilisation period, the progressive physiotherapy, and the gradual functional restoration take months. Patients who understand this timeline before surgery — and who approach it as an investment in long-term function rather than a delay in recovery — achieve the best outcomes.
💬 What is your current preferred surgical approach for severe basal thumb osteoarthritis — and has your practice changed with the evolution of joint replacement options in recent years?