Scaphoid Fracture — Why Can the First X-Ray Be Normal?

Thumb-side wrist pain after a fall can still represent a scaphoid fracture even when the first X-ray looks normal. If there is persistent tenderness in the anatomical snuffbox or over the scaphoid, the wrist should be protected and further imaging selected according to the clinical picture. Dismissing the injury too early as a simple bruise can delay treatment.

Polish version · For Patients

Where is the scaphoid?

The scaphoid lies on the thumb side of the wrist and links the proximal and distal rows of carpal bones. It carries substantial load when the hand is used for support. The classic injury mechanism is a fall onto an outstretched hand, particularly with the wrist extended.

Its blood supply is unusual: much of it enters distally and travels toward the proximal pole. Fractures closer to the forearm may therefore heal more slowly and carry a greater risk of nonunion or avascular necrosis than more distal fractures.

Which symptoms raise suspicion?

Typical features include pain and tenderness on the thumb side of the wrist, often worse with gripping, pushing through the hand or moving the wrist. Swelling may be modest and finger movement can remain normal. The absence of obvious deformity does not exclude a fracture.

• pain in the anatomical snuffbox on the back of the wrist;
• tenderness over the scaphoid tubercle on the palm side;
• pain with axial loading of the thumb or strong gripping;
• persistent symptoms after a fall despite an apparently normal first X-ray.

Why can the first X-ray be normal?

A fresh fracture line can be very fine, may run at an unfavourable angle to the X-ray beam or may be obscured by overlapping carpal bones. Dedicated scaphoid views improve detection, but even appropriate radiographs do not identify every acute fracture.

If the examination still strongly suggests a scaphoid fracture, a normal radiology report should not automatically end the investigation. Immobilisation is often used while the diagnosis is clarified. Early MRI can reveal an occult fracture and other associated injuries, while CT is particularly good for defining the fracture line, displacement and subsequent union.

How does an orthopaedic surgeon choose MRI, CT or repeat X-ray?

MRI is highly sensitive for an acute occult scaphoid fracture and does not use ionising radiation. It can be especially useful when clear tenderness persists after injury but initial radiographs are normal.

CT is particularly useful for fracture geometry. It can define displacement, instability and fragment position and is also useful when assessing union. Repeat radiographs after a period of immobilisation are still used in some pathways, but early MRI may confirm or exclude the injury sooner. The best test depends on availability, time since injury and the specific clinical question.

How is a scaphoid fracture treated?

Treatment depends on fracture location, displacement, stability, time since injury and the patient’s functional requirements. Stable, nondisplaced fractures of the distal scaphoid or waist can often be treated with immobilisation. Follow-up is still important because improvement in pain does not necessarily mean complete bony union.

Surgery is considered more often for significant displacement, instability, proximal-pole fractures, delayed diagnosis, established nonunion or particular functional demands. Fixation commonly uses a compression screw. Surgery does not remove every healing risk and does not automatically allow an immediate return to sport or heavy manual work.

What should be avoided while a fracture is still suspected?

• do not repeatedly “test” the wrist with push-ups, weight-bearing or strong gripping;
• do not remove prescribed immobilisation simply because the pain has improved;
• do not treat a normal first X-ray as definitive exclusion of fracture when focal tenderness persists;
• do not return to contact sport before safe healing has been confirmed.

When is urgent assessment needed?

Urgent assessment is needed for visible deformity, an open wound, rapidly increasing swelling, very severe pain, numbness or weakness of the fingers, or a hand that becomes pale, blue or cold. Increasing pain inside an immobilisation, a marked pressure sensation or worsening sensation also requires prompt review.

Other causes of thumb-side wrist pain

Pain in this area can also arise from ligament injury, a distal radius injury or tendon disorders. De Quervain tenosynovitis typically develops without a single acute fall and affects the first extensor compartment. Pain on the little-finger side of the wrist has a different differential diagnosis, including TFCC injury.

References

1. Clementson M, Björkman A, Thomsen NOB. Acute scaphoid fractures: guidelines for diagnosis and treatment. EFORT Open Reviews. 2020;5(2):96–103. DOI: 10.1302/2058-5241.5.190025.
2. National Institute for Health and Care Excellence. Fractures (non-complex): assessment and management. NG38. Recommendations on imaging for suspected scaphoid fracture. NICE NG38.

Content prepared by: Tomasz Poboży - orthopaedic surgeon.