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Guyon's Canal Syndrome: Ulnar Nerve at the Wrist

Aret Aboulian
Aret AboulianChiropractor
July 6, 20255 min read

Cyclists call it 'handlebar palsy' for a reason, this ulnar nerve entrapment happens at the wrist, not the elbow, and the symptom pattern gives it away.

A Second Site for the Same Nerve

The ulnar nerve can become compressed at more than one point along its path, ulnar nerve entrapment is the broader category this falls under., and Guyon's canal, a small tunnel on the palm side of the wrist, on the pinky-finger side, is one of them. Guyon's canal syndrome refers to compression of the ulnar nerve at this specific site, distinct from cubital tunnel syndrome, which affects the same nerve further up at the elbow.

How It Presents

Symptoms centre on numbness and tingling in the ring and little finger, similar to cubital tunnel syndrome, but with one useful distinguishing feature: sensation on the back of the hand is usually unaffected, because the nerve branch supplying that area splits off before reaching Guyon's canal. If sensation over the back of the hand is also affected, the compression is more likely happening higher up, at the elbow.

Weakness in the small muscles of the hand can also develop in more established cases, sometimes noticed first as difficulty with fine grip tasks or a general sense of hand clumsiness.

Who Tends to Get It

Direct, repetitive pressure over the base of the palm is the most common driver, cyclists resting their weight through the handlebars for long periods (sometimes called 'handlebar palsy'), tradespeople using vibrating tools, and anyone who spends long periods with sustained pressure across the heel of the hand. Ganglion cysts in the area are a less common but recognised structural cause.

Confirming the Diagnosis

Because Guyon's canal syndrome and cubital tunnel syndrome share overlapping finger symptoms, a proper neurological examination, testing sensation distribution carefully, along with specific provocation tests at the wrist and elbow, is what actually differentiates the two. Getting this right changes where treatment needs to focus.

What Tends to Help

Modifying the activity or equipment causing direct pressure over the canal, padded gloves and handlebar adjustments for cyclists, for example, is often a meaningful first step. Alongside that, soft tissue work, nerve mobilisation, and monitoring for any structural cause like a cyst that might need separate attention all form part of a considered approach to recovery.

For educational purposes only. Does not supersede advice from your GP or specialist.

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