Oliver Bee RMTRegistered Massage Therapist

Massage therapy · Kitchener–WaterlooCarpal Bone Fracture

Elbow, Wrist & Hand

What It Is

The wrist is made up of 10 bones: the eight small carpal bones, arranged in two rows of four, and the ends of the two forearm bones, the radius and the ulna (AAOS, n.d.a). A carpal bone fracture is a break in one of the eight carpal bones, such as the scaphoid on the thumb side of the wrist. The term "broken wrist" is also often used for a break at the end of the radius (a distal radius fracture), which is one of the most common broken bones (AAOS, n.d.b). This sheet focuses on carpal bone fractures, with some general advice for any broken wrist.

By far the most common cause of injury is a fall onto an outstretched hand (AAOS, n.d.a; AAOS, n.d.b). Injuries can also happen during sport (e.g. hitting a tree stump during golf, or trauma during contact sports) or in a road traffic accident (AAOS, n.d.a).

Carpal Bone Fracture Anatomy

Nestled between the hand and the forearm, the wrist extends from the pronator quadratus muscle, which lies across the lower ends of the radius and ulna, to the carpometacarpal joints, where the wrist meets the bones of the hand. The eight carpal bones are held together by a network of interwoven ligaments.

The blood supply of the scaphoid is especially important. Blood enters the end of the scaphoid nearest the thumb and flows "backwards" towards the end nearest the forearm. Because of this, breaks near the forearm end of the scaphoid heal more slowly, and a fracture can cut off the blood supply to part of the bone so that it dies. This is called avascular necrosis, and it can cause long-term problems in the wrist (AAOS, n.d.a).

Not a diagnosis — for more information, contact me or another trusted healthcare provider.

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At Fearless Heart, 25 Dupont St E in Uptown Waterloo, or as a home visit across Kitchener–Waterloo.