Hallux rigidus
Hallux rigidus or stiff big toe is stifffness, or an abnormally limited range of motion, of the metatarsophalangeal joint (MTP), which is located at the base of the hallux (big toe). Hallux flexus was initially described by Davies-Colley in 1887 as a plantar flexed posture of phalanx relative to the metatarsal head.