Certified Hand Therapist (CHT) Practice Exam

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What is distinctive about Eaton classification type 4 for sprain/dislocations?

Complete dislocation without fractures
Avulsion of less than 40% of the articular surface
Fracture or impaction of the articular surface of more than 40%
Dorsal dislocation without ligamental involvement

The correct answer is: Fracture or impaction of the articular surface of more than 40%

Eaton classification type 4 is characterized by the presence of a fracture or impaction of the articular surface that affects more than 40%. This classification is used to categorize the severity and implications of injuries related to the carpometacarpal joint, particularly the thumb. The inclusion of a substantial injury to the articular surface indicates a significant disruption to the joint's integrity, which often necessitates a more involved therapeutic approach and may include surgical intervention. Understanding this classification can help clinicians determine the appropriate treatment options and rehabilitation protocols, especially since injuries of this nature can lead to chronic pain and dysfunction if not managed correctly. The other classifications in the Eaton system correspond to different injury mechanisms and severity levels, emphasizing the importance of distinguishing between them to ensure the best outcomes for patients.