a rare congenital disease that causes myotonia, muscular hypertrophy, joint and long bone abnormalities, and weakness. Synonym(s): Schwartz-Jampel disease
my·o·ton·ic chon·dro·dys·tro·phy
(mī-ō-ton'ik kon'drō-dis'trŏ-fē) A rare congenital disease that causes myotonia, muscular hypertrophy, joint and long bone abnormalities, and weakness.