acromyotonia

Myotonia affecting the extremities only, resulting in spastic deformity of the hand or foot. SYN: acromyotonus. [acro- + G. mys, muscle, + tonos, tension]

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ac·ro·myo·to·nia (ak″ro-mi″o-toґne-ə) [acro- + myotonia] contracture of the hand or foot resulting in spastic deformity.