<unk>  is a genetic, neuromuscular disorder characterized by the slow relaxation of the muscles. Symptoms may include muscle stiffness and hypertrophy (enlargement). The disorder is caused by a genetic mutation involving the chloride channel of the muscles. The muscle stiffness, which particularly occurs in the leg muscles, may be enhanced by cold and inactivity, and is often relieved by exercise.
Myotonia congenita
Klumpke paralysis
Cardiofaciocutaneous syndrome
Hyperkalaemic periodic paralysis
Muscular dystrophy
Braddock syndrome
Neuromyotonia
Hallux rigidus