Abstract
We observed a case of compression of the deep branch of the ulnar nerve distal to the piso-hamate hiatus due to an aberrant fibrous band arising from the hamulus ossi hamatum and ending in the flexor digiti minimi muscle. An anatomical study of eleven fresh cadaver hands revealed that between the piso-hamate hiatus and the palm, the nerve passes through an osteo-fibrous tunnel in which multiple anomalies can occur. The authors think that ulnar nerve neurolysis at the wrist must always extend up to the palm.
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