Skier's Thumb: The Fall That Needs Checking Before the Season Starts

A jammed thumb after a fall on snow reliably gets classified as minor, partly because thumbs are not dramatic and partly because most of them do settle.

Here is what the ligament does, why one particular complication decides the entire treatment path, and what to do about a thumb that has not felt right since last season.

The ligament that keeps your grip working

The ulnar collateral ligament sits on the inside of the thumb, at the joint where the thumb meets the hand. Its job is to stop the thumb splaying outward away from the palm when you grip or pinch something.

That is a bigger deal than it sounds. Every time you pinch, hold a pole, open a jar, turn a key, or grip anything between thumb and fingers, that ligament resists the force trying to push the thumb sideways. An unstable thumb makes a large share of hand function unreliable.

The injury mechanism is a fall that forces the thumb into extreme abduction or hyperextension, as described in the StatPearls overview of ulnar collateral ligament injury. Falling onto a ski pole is the classic version, which is where the name comes from, though the same thing happens in any fall onto an outstretched hand where the thumb catches.

The older name, gamekeeper's thumb, comes from a chronic version described in gamekeepers whose work involved repeated stress on the same ligament.

The Stener lesion is the reason this needs an assessment

Most sprains heal because the torn tissue ends stay close enough together to knit back. That assumption is what makes a wait-and-see approach reasonable for a lot of injuries.

The thumb has a specific anatomical trap. When the ligament tears completely, the torn end can retract and come to rest on top of the adductor aponeurosis, a sheet of tissue lying nearby. Once that happens, the two ends of the ligament are separated by tissue that will not let them meet, and the ligament cannot heal in an anatomic position through immobilisation. This is a Stener lesion, and it generally requires surgery to bring the ligament back where it belongs.

That single anatomical detail is why a thumb injury from a fall deserves a proper examination rather than a splint from the pharmacy and optimism. From the outside, a partial tear that will do well in a splint and a complete tear with a Stener lesion both present as a swollen, painful, tender thumb.

How it gets assessed

Physical assessment relies on stress testing the joint, applying a sideways force to the thumb with the joint held in a specific position, and comparing the result carefully to the uninjured side. The comparison matters because normal laxity varies between people.

The findings that suggest a complete tear include laxity substantially greater than the other thumb and the loss of a firm endpoint, meaning the joint opens without the ligament catching it. Imaging is used when the examination is unclear or when a fracture needs excluding, since the ligament can pull a fragment of bone away with it.

This is worth having done by someone who examines these regularly. The difference between a partial and complete tear on a swollen, painful thumb in the days after an injury is not always obvious, and the consequences of getting it wrong fall on the person who ends up with a chronically unstable thumb.

What treatment involves

For partial tears and strains, non-operative management is generally sufficient. That typically involves rest, ice, compression, and elevation early on, then immobilisation in a thumb spica splint, described in the clinical literature as roughly six weeks in total, often split between an initial period of strict immobilisation and a later period during rehabilitation.

For complete tears, surgical intervention is generally indicated, both to repair the ligament and to address a Stener lesion if one is present. Techniques for reattaching the ligament include suture anchors and bone tunnelling. General guidance is to wait at least six weeks before returning to work or sport, though the specific timeline depends on the procedure and the surgeon's protocol.

Rehabilitation after either path is about restoring motion, then grip and pinch strength, then the specific demands of whatever you are going back to. The thumb tends to get stiff after immobilisation, and regaining the strength to pinch and grip confidently takes longer than regaining the range.

Why now is a better time to sort this out than January

Anyone who took a fall last winter and has a thumb that still feels loose gripping a pole, aches with pinching, or has not quite returned to normal is in a much better position to deal with it now than mid-season.

Chronic instability from an untreated complete tear does not tend to resolve on its own, and it makes the joint work differently over time. Getting an answer in the off-season leaves room for whatever the answer requires.

The same logic applies across winter sports. Our guides to snowboarding and broken wrists and ski knee injuries cover the other two injuries that fill North Shore clinics every winter, and both reward the same pre-season attention.

Preventing it in the first place

The pole strap is the recognised culprit for a reason. Skiing with hands out of the straps, or using poles with releasable or breakaway strap systems, removes the specific mechanism where a planted pole levers the thumb sideways during a fall.

Learning to let go of the poles during a fall is the other half of it, though that is easier to describe than to do reliably in the moment.

For anyone building toward the season, general pre-season conditioning reduces the fatigue that makes late-day falls more likely, which is indirectly the best prevention available for an injury that happens by accident.

When to get it looked at

A thumb that is painful, swollen, and unstable after a fall should be assessed promptly rather than managed at home. So should a thumb that feels loose or weak when pinching, even months after the original injury.

Some situations need urgent medical attention: an obvious deformity, an inability to move the thumb, numbness, a wound over the joint, or a thumb that is pale or cold. Those are calls to your physician or to Lions Gate Hospital rather than a physiotherapy booking.

If you injured a thumb last season and it still does not feel right, book a 30-minute assessment before the snow arrives and we will test the joint properly and tell you what you are dealing with. You can see what we treat or reach the clinic here.

This article is general information, not personal medical advice. A regulated practitioner can confirm whether the patterns described apply to you.

Sources

• Ulnar Collateral Ligament Injury (Gamekeeper's Thumb), StatPearls, NCBI Bookshelf
• Surgical Management of Thumb Ulnar Collateral Ligament Injuries: A Systematic Review and Meta-analysis of 614 Patients (2025)
• College of Health and Care Professionals of BC public registry

This article is for general information only and does not constitute medical advice, diagnosis, or treatment. Individual presentations vary — assessment findings and treatment plans differ from person to person. If you are experiencing severe symptoms, neurological changes (numbness, weakness, bowel or bladder changes), or a significant trauma, contact your physician or emergency services. Care at Medstar Sport Physio & Health is provided by practitioners registered with their respective British Columbia regulatory colleges.