Sander HW, Quinto C, Chokroverty S. Median-ulnar anastomosis to thenar, hypothenar, and first dorsal interosseous muscles: collision technique confirmation.
Muscle Nerve 1997;
20:1460-2. [PMID:
9342166 DOI:
10.1002/(sici)1097-4598(199711)20:11<1460::aid-mus17>3.0.co;2-5]
[Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Median-ulnar anastomosis (Martin-Gruber anastomosis; MGA) is traditionally diagnosed based upon changes in compound muscle action potential (CMAP) amplitude following proximal stimulation. We describe a rare patient with a MGA innervating thenar, hypothenar, and first dorsal interosseous muscles. Proximal stimulation, however, evoked CMAPs with striking changes in morphology and area but only minimal amplitude changes, due to concomitant diagnoses of carpal tunnel syndrome and polyneuropathy. Collision studies were therefore required for diagnostic confirmation of the MGA.
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