Guttering Interosseous Atrophy

Electrodiagnostic studies are able to differentiate une from radiculopathies and lower trunk plexopathy.

Guttering interosseous atrophy.

When assessed by needle emg the first dorsal interosseous is the muscle most likely to be affected followed by the abductor digit quinti and flexor carpi ulnaris. Palmar interossei ask the patient hold a card between two fingers while you attempt to pull it away using the same two fingers. Interossei weakness atrophy and claw hands may be noted in severe cases. Examine the functions of the muscles supplied by the ulnar nerve.

Causes include compression of the ulnar nerve by an aponeurotic band that runs from the medial epicondyle of the humerus to the medial border of the olecranon direct trauma to the. In the hand there are four dorsal interossei which lie superficially inbetween the metacarpals on the dorsum of the hand. The position of the insertion site is dependent on which digit is involved. There are four dorsal interossei in each hand.

Waldman md jd in atlas of common pain syndromes fourth edition 2019. They are specified as dorsal to contrast them with the palmar interossei which are located on the anterior side of the metacarpals. The dorsal interosseous muscles are bipennate with each muscle arising by two heads from the adjacent sides of the metacarpal bones but more extensively from the metacarpal bone of the finger into. Each muscle is bipennate in shape and extends from the proximal ends of adjacent metacarpals to the proximal phalanx and dorsal digital expansion of the appropriate finger.