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Adaptation of the properties of spastic muscle with wrist extension deformity.

Smeulders MJ, Kreulen M

Department of Plastic, Reconstructive and Hand Surgery, Academic Medical Center, Amsterdam, Suite G4-226, P.O. Box 22700, 1100 DE Amsterdam, The Netherlands.

To show that human muscle may adapt to tendon transfer, adaptation of flexor carpi ulnaris (FCU) function was studied by measuring active and passive length-force characteristics at initial operation and at reoperation in a case of extension deformity secondary to FCU tendon transfer. At reoperation, FCU was 20 mm shorter; active force decreased approximately 10%, indicating atrophy; and passive force increased, reflecting increased stiffness. FCU fiber length was unchanged. The presented case shows that human forearm muscle may adapt to a transferred function.

Published 28 August 2006 in Muscle Nerve, 34(3): 365-8.
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