You fell onto your hand a few days ago. The wrist pain is easing, but it persists in one precise spot, in the hollow at the base of the thumb. The X-ray showed “nothing,” and yet you were put in a cast, or asked to come back. It's confusing.
This isn't excessive caution. The scaphoid fracture is the best example, in hand trauma, of an injury better treated with an excess of caution than discovered too late. This article explains why.
One tiny bone, two big problems
The scaphoid is one of the eight carpal bones, the row of bones that forms the wrist. It sits on the thumb side, and you can sense it in the small hollow that appears at the base of the thumb when you spread it — the “anatomical snuffbox.”
It is a mechanically key bone: it links the two rows of carpal bones and takes part in almost every movement of the wrist. But its significance, and its difficulty, come from two features.
Problem no. 1: it hides
Because of its elongated shape, its oblique orientation, and its position, the scaphoid is hard to see on a standard X-ray, especially in the first few days. Depending on the series, between 5 and 20% of non-displaced fractures are not visible on the first X-rays. Occult fractures
In other words: a normal X-ray does not rule out a scaphoid fracture. This is the point from which everything else follows.
Problem no. 2: its blood supply runs backwards
This is the peculiarity that makes this fracture different from every other one in the wrist.
The scaphoid receives its blood through its lower end, the one close to the thumb. The blood then travels through it from bottom to top — a so-called retrograde circulation.
Why this is decisive
When the fracture runs through the middle or the top of the bone, it cuts off the blood supply to the upper fragment. That fragment, deprived of blood supply, heals poorly or not at all.
Two consequences follow directly: a risk of failed healing — the bone does not knit together — and a risk of necrosis of the upper fragment, which loses its blood supply. The higher the fracture on the bone, the greater this risk.
It is this vascular fragility that justifies all the caution in management. We do not immobilize a wrist for weeks for a simple sprain: we do it because a missed scaphoid fracture can progress to lasting complications that are hard to reverse.
The signs that should raise suspicion of a scaphoid fracture
After a fall onto the hand, certain signs point toward it, though none is ever enough on its own:
Pain in the anatomical snuffbox — that small hollow at the base of the thumb — on pressure. This is the most classic sign.
Pain on pressure along the axis of the thumb, when pushing it toward the wrist.
Pain at the base of the thumb when gripping or twisting (a key, a handle).
Subtle swelling on the outer side of the wrist.
These signs are sensitive but not very specific: they are often present when there is a fracture, but they can occur without one. This is precisely what leads to the rule of caution described below.
The reflex to have
Persistent pain at the base of the thumb after a fall onto the hand should not be blamed on a simple sprain without being evaluated. This is the most common mistake, and the one with the heaviest consequences.
Don't hesitate to request a CT scan straight away, which will confirm or rule out the diagnosis of a scaphoid fracture.
Many scaphoid fractures are first mistaken for a sprain. The pain eases, the patient doesn't seek care, and the fracture is discovered months later, once complications have set in.
Diagnosis: why you're put in a cast without the fracture having been seen
The approach seems strange from the patient's point of view. It is in fact perfectly logical once you understand the scaphoid's two problems.
First step: the X-ray
Specific scaphoid X-rays, from several angles, are taken. If they show the fracture, management is decided. If they are normal but the clinical examination is suggestive, we do not conclude that there is no fracture.
Second step: the rule of caution
Faced with clinical suspicion and a normal X-ray, the classic approach is to immobilize the wrist and re-check later — with a new X-ray, or more directly with finer imaging. We treat the doubt as a fracture, because the cost of a missed fracture is far greater than that of a few days of unnecessary immobilization.
The imaging that settles it
Two tests can lift the doubt faster than simply repeating an X-ray:
This is the reference test for detecting a fracture invisible on X-ray. Its sensitivity is very high, close to 100% in studies, and it shows the bone from the first few days. Done early, it shortens unnecessary immobilization and the period of uncertainty.
It clarifies the geometry of the fracture, its displacement, and its line, which is useful for planning treatment.
In experienced hands, it can also spot certain occult fractures.
Treatments
The general rule: stable, non-displaced fractures heal well with immobilization; displaced, unstable, or high-on-the-bone fractures are more readily managed with surgery.
Nonoperative treatment
It relies on prolonged immobilization, longer than for most fractures — the price of the fragile blood supply. The duration depends on where the fracture is: the higher it is on the bone, the slower the healing.
This prolonged immobilization is demanding, and it is one of the arguments for discussing surgery in some patients — especially the most active, for whom several weeks in a cast are difficult.
Surgical treatment
It most often consists of fixing the fracture with a screw placed along the axis of the bone, sometimes through a short incision, sometimes percutaneously. The goal is twofold: to achieve solid healing, and to shorten immobilization so activity can resume sooner.
The choice between a cast and surgery, for non-displaced fractures, is a matter for discussion: surgery allows a faster return to activity but carries the risks inherent in any operation. The decision is made case by case, according to where the fracture is, the patient's profile, and their expectations.
When the fracture hasn't healed: nonunion
This is the complication that gives all the meaning to the initial caution, and it deserves an explanation.
When a scaphoid fracture does not knit together, we call it a nonunion: the two fragments remain mobile relative to each other, like a false joint. It is most often the result of a fracture that went unnoticed, or was insufficiently immobilized.
Why it should not be left to progress
An untreated scaphoid nonunion alters the mechanics of the wrist and leads, over time, to progressive osteoarthritis following a well-described sequence. The discomfort can take years to appear, which is why people sometimes keep using the wrist without knowing — until damage that is hard to reverse has set in.
Its treatment is surgical, often by a bone graft combined with fixation, sometimes by techniques aimed at restoring blood supply to the fragment. The results depend largely on how old the nonunion is and on the state of the cartilage. This is an area where the hand surgeon's experience particularly counts.
Rehabilitation and recovery time
As with any prolonged immobilization, moving whatever is not immobilized — fingers, elbow, shoulder — is recommended from the outset to prevent stiffness.
Resuming activities depends closely on healing, which is checked by imaging before allowing any strain. The timeline is longer than for many fractures, and returning to weight-bearing or contact sports happens only after healing is confirmed.
After the cast or after surgery
This section requires a case-by-case, contextualized exploration: consult our knowledge center.
Frequently asked questions
Glossary
A small carpal bone at the base of the thumb, the most frequently fractured of the wrist bones after the radius.
The set of eight small bones located between the forearm and the hand, forming the wrist.
A small hollow at the base of the thumb, over the scaphoid, where the characteristic pain is located.
Blood circulation that travels through the scaphoid from bottom to top, exposing the upper fragment in the event of a fracture.
Failure of a fracture to heal, the fragments remaining mobile like a false joint.
Death of a bone fragment deprived of blood supply.
References
Unstable occult scaphoid fracture diagnosed by dynamic point-of-care ultrasound: a case report and review. PMC12626820 — between 5 and 20% of non-displaced fractures are not visible on the initial X-rays; retrograde blood supply from the dorsal branch of the radial artery, exposing the proximal pole to necrosis and nonunion
The role of magnetic resonance imaging in the evaluation of scaphoid fractures. PMC6399182 — early MRI is recommended after a negative X-ray; high sensitivity and specificity, reduced immobilization and time off work
The Role of Magnetic Resonance Imaging in Scaphoid Fractures. J Hand Surg — MRI remains the reference test for occult fractures, sensitivity of 95 to 100%, specificity close to 100%
Diagnosis and Management of Scaphoid Fractures. American Family Physician. 2004 — faced with clinical suspicion and a negative X-ray, immobilization and reassessment at two weeks
Radiographically occult scaphoid fractures: value of MR imaging in detection. Radiology. 1997 — MRI detects occult carpal fractures not visible on X-ray
Epidemiology of scaphoid fracture and its proportion among carpal fractures
Immobilization durations by location (proximal pole, body, tubercle)
Wrist osteoarthritis sequence following scaphoid nonunion (SNAC wrist)
Comparison of surgery vs. immobilization for non-displaced fractures
Reviewed and approved by Dr Frédéric Teboul, surgeon of the hand, brachial plexus, and peripheral nerves, member of the Académie Nationale de Chirurgie.
Last updated: August 20, 2026
Disclaimer. This article is for informational purposes. It does not replace a medical consultation. If you have wrist pain after a fall, seek care without delay — a scaphoid fracture is not always visible right away.
Author of this publication
Each piece of content is signed by its author and reviewed before publication.
Author
Dr Frédéric Teboul
Hand surgeon — specialist in the brachial plexus and peripheral nerves