Certified Hand Therapist (CHT) Practice Exam

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What condition describes ulnar hammer syndrome?

Compression of the ulnar nerve
Thrombosis of the ulnar artery
Dislocation of the ulnar joint
Tendon rupture associated with ulnar deviation

The correct answer is: Thrombosis of the ulnar artery

Ulnar hammer syndrome is characterized by thrombosis of the ulnar artery, typically occurring due to repeated trauma or compression, often as a result of activities that involve hammering or using tools where impact is transferred to the ulnar aspect of the wrist. This condition is akin to an effort-induced compromise of the ulnar artery, leading to reduced blood flow and possible ischemia. Understanding the underlying mechanics, it’s clear that the repeated impact or vibration can damage the vessel, and thrombosis may follow as a complication, leading to symptoms such as pain, numbness, or tissue changes due to inadequate blood supply. In contrast, other conditions listed do not align with the definition of ulnar hammer syndrome, as they involve different mechanisms and anatomical structures, such as nerve compression, joint dislocation, or tendon injuries, which are distinct medical issues.