A rare inherited neuromuscular disease with prenatal presentation (usually in the second trimester) of reduced fetal movements and abnormal positioning. This results in joint abnormalities that may involve both lower and upper extremities and is usually symmetric. Also associated with severe hypotonia at birth, bilateral club foot, motor development delay, mild facial weakness without ophthalmoplegia, absent deep tendon reflexes, normal motor and sensory nerve conduction velocities, no cerebellar or pyramidal involvement and progressive disease course with loss of ambulation after the first decade of life. [from
SNOMEDCT_US]