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. 2021 Oct 20;12(11):1274. doi: 10.3390/mi12111274

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Isolated MCP extension of thumb: (a) thumb is at the flexed position, MCP joint angle: 25° (b–d) Intermediate MCP joint positions (e) thumb is at the extended position, MCP joint angle: 0°.