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Radial Shaft Fracture – Causes, Symptoms & Treatment

A radial shaft fracture is a break in the shaft of the radius, one of the two forearm bones. It is most commonly caused by direct trauma or a fall onto the outstretched hand.

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Things worth knowing about "Radial Shaft Fracture"

A radial shaft fracture is a break in the shaft of the radius, one of the two forearm bones. It is most commonly caused by direct trauma or a fall onto the outstretched hand.

What is a Radial Shaft Fracture?

A radial shaft fracture is a break occurring in the mid-portion (shaft) of the radius, one of the two long bones of the forearm. The radius runs along the thumb side of the forearm and plays a critical role in forearm rotation and wrist movement. While less common than fractures at the distal end of the radius, shaft fractures are clinically significant because they can substantially impair forearm function.

Causes

Radial shaft fractures typically result from:

Direct trauma: A direct blow to the forearm from a fall, accident, or impact.
Indirect forces: A fall onto an outstretched hand where force is transmitted along the bone to the shaft.
Torsional forces: Twisting of the forearm, common in sports injuries or motor vehicle accidents.
Pathological fractures: Fractures occurring through weakened bone due to conditions such as osteoporosis or bone tumors.

Important associated fracture patterns include the Galeazzi fracture (distal radial shaft fracture with dislocation of the distal radioulnar joint) and the Monteggia fracture (proximal ulna fracture with dislocation of the radial head).

Symptoms

Common signs and symptoms of a radial shaft fracture include:

Severe pain in the forearm, worsening with movement
Swelling and bruising over the forearm
Visible deformity or angulation of the forearm
Reduced or absent range of motion at the wrist and forearm
Point tenderness directly over the fracture site
In rare cases, numbness or tingling due to associated nerve or vessel injury

Diagnosis

Diagnosis of a radial shaft fracture involves a combination of clinical assessment and imaging.

Clinical Examination

The physician assesses pain, swelling, and neurovascular status (circulation, motor function, and sensation) of the affected arm.

Imaging

X-ray: The primary diagnostic tool. Anteroposterior and lateral views of the entire forearm, including the elbow and wrist joints, are obtained to identify associated injuries.
CT scan: Used for complex fractures or when the extent of injury is unclear on plain X-rays.

Treatment

Treatment depends on the fracture pattern, degree of displacement, associated injuries, and the age of the patient.

Conservative Treatment

Non-displaced or minimally displaced fractures, particularly in children, may be managed conservatively with immobilization in a cast or orthosis for several weeks. Regular follow-up X-rays monitor the healing process.

Surgical Treatment

In adults, displaced radial shaft fractures typically require surgery, as anatomical reduction is essential for restoring forearm rotation (pronation and supination). Common surgical approaches include:

Plate and screw fixation (open reduction internal fixation): The standard treatment for adults, using a metal plate to hold bone fragments in place.
Intramedullary nailing: Insertion of a nail into the bone canal -- less commonly used for the radius.
External fixation: Used for open fractures or heavily contaminated wounds.

Rehabilitation

Following immobilization or surgery, physiotherapy is essential to restore range of motion, strength, and coordination of the forearm and hand. Full recovery may take several months depending on fracture severity.

Potential Complications

Malunion with loss of forearm rotation (pronation/supination deficit)
Nerve injury (e.g., radial nerve, median nerve)
Vascular injury
Compartment syndrome (increased pressure within the muscle compartment)
Nonunion (failure of the bone to heal)
Implant failure or post-operative infection

References

Court-Brown C M, Heckman J D et al. Rockwood and Green's Fractures in Adults. 8th edition. Wolters Kluwer, Philadelphia 2015.
Muller M E et al. The Comprehensive Classification of Fractures of Long Bones. Springer, Berlin 1990.
Egol K A, Koval K J, Zuckerman J D. Handbook of Fractures. 5th edition. Wolters Kluwer, Philadelphia 2015.

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