In Metacarpophalangeal Extension (Thumb) measurement, where is the fulcrum placed?

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Study for the NATA BOC Domain 2 Clinical Evaluation and Diagnosis Test. Utilize our comprehensive flashcards and multiple-choice quiz features; each question comes with hints and thorough explanations. Prepare effectively for your certification exam!

Multiple Choice

In Metacarpophalangeal Extension (Thumb) measurement, where is the fulcrum placed?

Explanation:
For measuring thumb MCP extension, the joint’s rotation occurs around an axis located at the dorsal surface of the MCP joint. Placing the goniometer’s fulcrum there lets the device rotate with the joint as the proximal phalanx moves into extension, giving an accurate reading of the angular change. Placing the fulcrum on the volar side would misalign with the actual axis and distort the measurement, and positions at the metacarpal head’s dorsal surface or laterally don’t align with the true joint rotation either.

For measuring thumb MCP extension, the joint’s rotation occurs around an axis located at the dorsal surface of the MCP joint. Placing the goniometer’s fulcrum there lets the device rotate with the joint as the proximal phalanx moves into extension, giving an accurate reading of the angular change. Placing the fulcrum on the volar side would misalign with the actual axis and distort the measurement, and positions at the metacarpal head’s dorsal surface or laterally don’t align with the true joint rotation either.

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