Which structures have been involved in ulnar entrapment?

Updated: Jun 08, 2018
  • Author: Charles F Guardia, III, MD; Chief Editor: Nicholas Lorenzo, MD, MHA, CPE  more...
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Wehrli and Oberlin described a different structure in the same region that might be involved in ulnar entrapment in some cases—the internal brachial ligament. [35] This structure was in fact described by Struthers, but not in relation to ulnar nerve entrapment. Wehrli and Oberlin advocated abolishing the concept of the arcade of Struthers.

Von Schroeder and Scheker described yet another structure, a fibrous tunnel in roughly the same region. [36] They maintained that the ulnar nerve goes through this tunnel and could be trapped therein and suggested naming this structure the arcade of Struthers.

Settling this anatomic controversy is beyond the scope of this article. It is sufficient to note that in rare cases, the ulnar nerve may be compressed considerably above the ulnar groove and that surgeons may find it entrapped in a fibrous or ligamentous structure that may correspond to one of the aforementioned anatomic descriptions.

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