Red: Inflammatory
Blue: Degenerative/Trauma/Tumor
Green: Crystals
Patient seated in front of the examiner, hand palm up resting on the examination table.
Place the transducer on transverse plane over the palmar wrist. First move the transducer cranially to identify the bony landmarks of the proximal carpal tunnel: radial sided the scaphoid tubercle, ulnarly the pisiform. To identify the distal carpal tunnel, muve the transducer distally over the radial sided trapezium tubercle and the hamate hook ulnarly.
mn: median nerve
fpl: flexor pollicis longus tendon
ua: ulnar artery
fds: flexor digitorum superficialis tendons
fcr: flexor carpi radialis tendon
fdp: flexor digitorum profundus tendons
mbun: main branch of ulnar nerve
note: tilting the probe helps to avoid anisotropy and to check the structures within the carpal tunnel. Use dynamic scanning (flexion and extension of the fingers) to assess the nine long flexor tendons (flexor digitorum superficialis, flexor digitorum profundus and flexor pollicis longus radially).
note: long axis view of the carpal tunnel
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