Her Lutz and flip are hindered by hallux valgus. In healthy adults, the plantar reflex causes a downward response of the hallux (flexion). It plantarflexes the hallux and assists in supination. The hallux only contains two phalanx bones, the proximal and distal. On the syndactylous hind feet, they possess an opposable hallux. He was sidelined with hallux rigidus, a degenerative arthritis in his toe. Swiftlets have four toes, except the Papuan swiftlet which lacks the hallux (back toe). The hindlimb ended in a three-toed foot (pes), with a raised hallux. The first digit, called the hallux, is homologous to the human big toe. The big toe is referred to as the hallux. This includes a non-opposable hallux, which is relocated in line with the other toes. Specifically, they found that "Archaeopteryx" had a primitive palatine, unreversed hallux, and hyper-extendable second toe. On the foot bones, this species had a grasping hallux. The hallux usually moves in the transverse plane. It is also one method of diagnosing functional hallux limitus.