What can be injured in a non-displaced distal radius fracture?

In the case of a non-displaced distal radius fracture, the extensor pollicis longus tendon can indeed be at risk. This tendon is responsible for extending the thumb and runs in close proximity to the distal radius. Although the fracture itself may not involve displacement, the associated trauma or swelling can affect the tendon.

In addition, the extensor pollicis longus tendon is particularly vulnerable because it travels in a groove at the wrist and is subjected to stress during movements that involve extension of the thumb. When there is an injury to the distal radius, even when it is non-displaced, there is a possibility of irritation, inflammation, or even rupture of this tendon, especially if there is significant edema or if the fracture leads to mechanical derangements of surrounding structures.

The other structures listed—such as the ulnar nerve, flexor carpi radialis, and biceps tendon—are typically less directly affected by this type of fracture. The ulnar nerve is more related to injuries at the elbow or wrist involving the medial side of the forearm. The flexor carpi radialis tends to be situated more palmar and is less likely to be impacted directly by a distal radius fracture. The biceps tendon is located