Wrist Fractures — Colles, Smith, Barton and Scaphoid

Wrist trauma questions become easier when you identify the bone, direction of displacement and joint involvement before choosing an eponym. Colles, Smith and Barton describe distal radial injury patterns. A scaphoid fracture involves a carpal bone and can occur without the obvious deformity of a displaced distal radius fracture. A fall on the outstretched hand can produce several of these injuries; the mechanism alone is insufficient for diagnosis.

Describe the distal fragment relative to the proximal radius. Dorsal displacement means movement towards the back of the wrist; volar or palmar displacement means movement towards the palm. The lateral radiograph is especially useful for this distinction. On the frontal view, inspect radial length, the radial styloid, the distal radioulnar joint and the carpal bones rather than looking only for a fracture line.

The classic Colles pattern is a distal radial metaphyseal fracture with dorsal angulation and displacement of the distal fragment. Radial shortening, dorsal comminution and an associated ulnar styloid fracture can accompany it. The typical mechanism is a fall on an outstretched hand with the wrist extended. In an older person, a low-energy fall should also prompt consideration of underlying bone fragility.

The dinner-fork deformity refers to the altered wrist contour created by the dorsally tilted distal radius. For an image question, find the distal radial articular surface and follow its alignment with the shaft. Do not diagnose Colles from swelling alone, or assume every dorsally displaced fracture has an intact joint surface. Clinical use of the name can be broad; detailed radiographic description is more useful for management.

A stable extra-articular fracture that is satisfactorily reduced may be treated with immobilisation and follow-up imaging. A fracture that loses reduction, remains substantially displaced or includes unstable articular injury needs specialist reassessment. The eponym is a recognition aid, not a complete treatment decision. Functional demand, fracture stability, skin condition and neurovascular findings all matter.

A Smith fracture is the familiar reverse Colles pattern: the distal radial fragment tilts or displaces volarly. A fall onto the dorsum of the hand, or a direct force to that surface, is a typical mechanism. The garden-spade description is a memory aid for its lateral contour. Volar displacement also raises concern about stability, so these injuries warrant early orthopaedic assessment.

A Barton fracture is an intra-articular rim fracture of the distal radius. It may affect the dorsal or volar rim. The carpus remains associated with the fractured rim and becomes subluxed or dislocated relative to the remaining radius. This combination of rim injury and radiocarpal displacement separates Barton from a simple reverse Colles pattern. These fractures are unstable and often need operative stabilisation.

When the stem mentions a volar fracture-dislocation, look for a volar rim fragment before selecting Smith. When it describes a dorsal rim fracture with the carpal bones shifting dorsally, select dorsal Barton. An examiner may supply the mechanism, deformity and radiograph together; the most specific anatomical finding should carry the greatest weight.

Suspect a scaphoid injury after wrist trauma when pain is concentrated on the radial side, particularly at the anatomic snuffbox or scaphoid tubercle. The wrist can look almost normal. Tenderness is a clue to investigate, not proof of a fracture; soft-tissue injuries can also be painful. Conversely, lack of a dramatic deformity does not exclude a clinically important carpal injury.

The scaphoid has a distal pole, waist and proximal pole. Its position on the radial side of the carpus makes it vulnerable during a fall onto an extended wrist. Examine the distal radius and ulna, the rest of the carpus, and the hand as well. A diagnosis of distal radius fracture does not remove the need to look for an associated carpal injury.

• Inspect swelling and the location of pain before palpation.
• Palpate the anatomic snuffbox and the volar scaphoid tubercle.
• Assess movement cautiously and avoid forcing a painful wrist.
• Check skin integrity and distal neurovascular function.
• Arrange appropriate wrist and scaphoid imaging; preserve suspicion when the first films are normal.

A typical examination vignette describes a young adult who falls on an outstretched hand, has radial wrist pain, and has an initially normal X-ray. The safe conclusion is possible occult scaphoid fracture, requiring protection and further assessment. Sending the patient away with an unqualified diagnosis of sprain ignores the fracture’s risk of nonunion and proximal-pole vascular compromise.

Initial plain radiographs can miss a scaphoid fracture. Obtain dedicated scaphoid views when indicated, but do not treat a negative study as a definitive exclusion if the examination remains suspicious. NICE recommends considering MRI as first-line imaging after a thorough clinical examination in suspected scaphoid fracture. This is different from assuming every patient must first wait for repeat radiographs.

When immediate definitive imaging is unavailable, immobilise the wrist and arrange a clear reassessment and imaging plan. StatPearls describes repeat radiographs after 7–14 days as a pathway for high clinical suspicion with negative initial films. MRI can reveal an occult fracture and associated marrow or ligament injury. CT is useful when assessing fracture geometry, displacement or union; the choice depends on the clinical question and available service.

Separate the tasks of detecting a fracture, measuring its displacement and establishing union. MRI is especially useful for occult injury; CT can provide detail for operative planning or assessment of healing. A follow-up image should answer a defined question. The patient also needs advice about protection, reassessment and worsening symptoms, rather than simply being told to return if pain continues.

Much of the scaphoid’s vascular supply comes from radial artery branches that enter distally or around the dorsal ridge. Blood reaches the proximal portion by retrograde flow. A fracture across the waist can therefore interrupt supply to the proximal fragment. The proximal pole is the classic answer when a question asks which scaphoid segment is most vulnerable to avascular necrosis.

Distal fractures generally heal more readily than proximal fractures. The practical relationship is anatomical: a proximal fragment has a less secure blood supply, and displaced fractures can disrupt both perfusion and stability. This is why fracture location matters even when two radiographs show apparently similar fracture lines. Avoid describing every scaphoid fracture as destined for avascular necrosis; the risk varies with the injury.

Selected stable, nondisplaced injuries can be managed with cast immobilisation; displaced, unstable or proximal-pole injuries may require fixation. Do not assign one universal cast duration to every fracture. Follow-up must assess union and function, with decisions based on location, displacement, associated injury and specialist review. Smoking cessation is relevant because smoking is associated with impaired scaphoid healing.

Begin with analgesia, inspection of the skin, assessment of circulation and nerve function, and appropriate immobilisation. Identify an open injury, skin compromise, a pulseless hand, progressive sensory change or tense painful compartments promptly. These findings require urgent specialist assessment. A neatly named fracture is less important than recognising a limb-threatening complication.

1. Document pulses, capillary perfusion, sensation and motor function before manipulation.
2. Obtain wrist radiographs and assess joint alignment and associated injuries.
3. Provide analgesia and suitable anaesthesia or sedation if reduction is needed.
4. Reduce displaced fractures when appropriate, immobilise, and repeat the neurovascular examination.
5. Check post-reduction images and arrange orthopaedic follow-up or admission according to stability and complications.

The median nerve is particularly relevant in distal radial fractures because acute carpal tunnel compression can follow swelling or displacement. Tingling in the median distribution, worsening pain or motor deficit must be taken seriously. Do not assume the presence of a radial pulse excludes nerve compromise or compartment syndrome. Record findings before and after reduction so that a new deficit is recognisable.

Closed reduction and casting are reasonable for suitable stable extra-articular injuries. Intra-articular displacement, fracture-dislocation, severe comminution, associated instability or failure to maintain reduction can change the plan towards fixation. Splinting provides protection while the definitive decision is made. Treatment should account for the patient’s age, functional needs and associated injuries, rather than using the eponym as a prescription.

Distal radius fracture complications include acute median nerve compression, malunion, stiffness, complex regional pain syndrome and post-traumatic arthritis. Extensor pollicis longus rupture is a recognised complication of Colles fractures and can present later with loss of thumb extension. Scaphoid questions instead emphasise occult presentation, nonunion, proximal-pole avascular necrosis and later SNAC wrist.

• Dorsal distal radial displacement with a dinner-fork contour: think Colles.
• Volar distal radial displacement with a garden-spade contour: think Smith.
• Articular rim fracture with a displaced carpus: think Barton.
• Radial styloid intra-articular fracture: think chauffeur’s fracture.
• Impaction of the lunate facet of the distal radius: think die-punch fracture.
• Persistent radial wrist pain with normal initial films: retain occult scaphoid fracture.

These additional eponyms help prevent overcalling every distal radial injury as Colles. Chauffeur’s identifies the radial styloid; die-punch identifies the lunate facet. The terms locate the injured part of the articular surface and should direct you back to the actual radiograph. Always check whether the carpus, distal radioulnar joint or another bone is injured as well.