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Resisted adduction

Procedure.

Resist the subject’s attempt to adduct the thumb

Common mistakes.

Resistance is given at the distal phalanx.

Anatomical structures tested:

Muscle function:

• Importallt thllmb adductor:

– Adductor pollicis

• Less important thumb addllctors:

– Flexor pollicis brevis, superficial head
– Opponens pollicis.

Common pathological situations:

• Pain occurs in a lesion of the adductor pollicis, usually in the oblique portion.
• Weakness occurs in lesions of either the ulnar nerve or the C8 nerve root.

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