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. 2021 Aug 2;41(5):1047–1059. doi: 10.1002/jum.15796

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© 2021 The Authors. Journal of Ultrasound in Medicine published by Wiley Periodicals LLC on behalf of American Institute of Ultrasound in Medicine.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Cadaveric image of the A2 pulley. A, The proximal fibers of A2 blend with the A1 pulley, creating a challenge in directly distinguishing the transition zone between the two pulleys. B, The arrows point to the proximal A2 pulley, flexor tendon, and the distal edge of the A2 pulley. Note that the leading edge is thickened in comparison to the proximal portion. The thinning of the proximal portion of the A2 pulley creates difficulty in identifying it with ultrasound imaging, a situation that can be improved with a high‐frequency transducer.