In 1988, Hattrup and Johnson described the following radiographic classification system: * Grade I – mild changes with maintained joint space and minimal spurring. * Grade II – moderate changes with narrowing of joint space, bony proliferation on the metatarsophalangeal head and phalanx and subchondral sclerosis or cyst. * Grade III – severe changes with significant joint space narrowing, extensive bony proliferation and loose bodies or a dorsal ossicle.
Hallux rigidus
Bunion
Klumpke paralysis
Periodic paralysis
Myoclonic dystonia
Torsion dystonia
Monomelic amyotrophy
Holmes tremor