Trigger Thumb

What is trigger thumb?

Trigger thumb in children is a condition where the thumb becomes stuck in a bent position. The flexor tendon that bends the thumb passes through a tight pulley near the base, and when there's a small thickening of the tendon, it can't slide smoothly — locking the thumb in flexion.

It's usually noticed in toddlers, often by parents who observe that the thumb won't straighten or pops when moved. Despite its name, it doesn't usually 'trigger' (snap) in the way the adult version does — it tends to be persistently bent.

Trigger thumb in children behaves differently from the adult condition and is managed differently. It's not associated with the same overuse patterns and tends to follow its own predictable course.

What does it feel like?

Children rarely complain of pain. The condition is usually noticed because of how the thumb looks or behaves:

• A thumb that's stuck in a bent position at the tip

• A small lump felt at the base of the thumb on the palm side

• Inability to straighten the thumb fully

• Sometimes a clicking or catching when the thumb is moved

• Often noticed in one thumb, occasionally both

Most children adapt to the limitation and use the thumb without obvious distress. Parents are typically the ones who flag it.

How is it diagnosed?

Diagnosis is clinical — based on examination of the thumb, the lump at the base, and the pattern of movement.

Imaging isn't usually needed for trigger thumb. The diagnosis is straightforward in most cases, and assessment focuses on confirming the diagnosis and ruling out other causes of a stiff thumb.

It's worth checking the other hand too, since both thumbs can be affected.

What are the treatment options?

Some cases of trigger thumb in young children resolve spontaneously, particularly in the first year or two. Watchful waiting is sometimes the right approach in younger children with milder problems.

Persistent cases — particularly those still present in older children — are typically treated with a small surgical procedure to release the tight pulley. It's a reliable, well-established procedure with quick recovery. Whether surgery is right in your child's case, and when, is something Nev will work through with you at your consultation.

When should you get it checked?

Seek a specialist assessment if:

• Your child's thumb is stuck in a bent position

• You can feel a small lump at the base of the thumb

• The thumb won't straighten despite gentle attempts

• Both thumbs are affected

• You'd like a clear plan and to understand the timing of any treatment

Trigger thumb is well understood and well treated. The main decisions are about timing — and that's where an experienced assessment makes a real difference.