After sustaining a distal radial fracture, which motion is predominantly affected due to angulation concerns?

• A. Elbow flexion
• B. Forearm supination and pronation
• C. Shoulder abduction
• D. Wrist ulnar deviation

Answer: (B)

The predominant motion affected after a distal radial fracture, particularly one that has angulation concerns, is forearm supination and pronation. This is due to the anatomical relationship between the radius and ulna, and how fractures in the distal radius can impact the mechanics of these two bones.

When there is an angulated fracture of the distal radius, it alters the alignment and functional interaction between the radius and ulna. Supination and pronation involve rotational movements of the forearm that rely heavily on the proper positioning of the radius relative to the ulna. If the distal radius heals incorrectly or remains significantly displaced, it can hinder the ability to perform these rotational motions effectively.

The other options, such as elbow flexion, shoulder abduction, and wrist ulnar deviation, are less directly impacted by the mechanics of a distal radial fracture. Elbow flexion is more influenced by the humerus and ulna, while shoulder abduction involves the shoulder girdle and is distant from the site of the fracture. Wrist ulnar deviation is affected by movements at the wrist joint as a whole, but the specific impairment following a distal radial fracture is primarily linked with the disruption in forearm rotation.