title: Functional hallux rigidus and the Achilles-calcaneus-plantar system.
abstract: Functional hallux rigidus is a clinical condition in which the mobility of the first metatarsophalangeal joint is normal under non-weight-bearing conditions, but its dorsiflexion is blocked when first metatarsal is made to support weight. In mechanical terms, functional hallux rigidus implies a pattern of interfacial contact through rolling, whereas in a normal joint contact by gliding is established. Patients with functional hallux rigidus should only be operated on if the pain or disability makes it necessary. Gastrocnemius release is a beneficial procedure in most patients.
authors.affiliation: Foot and Ankle Unit, Department of Orthopaedic Surgery, Hospital Universitario Quirón Madrid, Calle Diego de Velázquez 1, Pozuelo de Alarcón, Madrid 28223, Spain. Electronic address: e.maceira@telefonica.net.
authors.forename: Ernesto
authors.initials: E
authors.lastname: Maceira
authors.affiliation: Foot and Ankle Unit, Department of Orthopaedic Surgery, Hospital Universitario Quirón Madrid, Calle Diego de Velázquez 1, Pozuelo de Alarcón, Madrid 28223, Spain.
authors.forename: Manuel
authors.initials: M
authors.lastname: Monteagudo
mesh_terms: D000125:Achilles Tendon / Q000503:physiopathology*; D004863:Equinus Deformity / Q000503:physiopathology; D005528:Foot / Q000000981:diagnostic imaging / Q000503:physiopathology*; D005684:Gait / Q000502:physiology*; D020859:Hallux Rigidus / Q000000981:diagnostic imaging / Q000503:physiopathology*; D006801:Humans; D008683:Metatarsophalangeal Joint / Q000503:physiopathology; D018482:Muscle, Skeletal / Q000503:physiopathology*; D011859:Radiography; D016059:Range of Motion, Articular; D016474:Weight-Bearing
keywords: Achilles-calcaneus-plantar system; Functional hallux rigidus; Metatarsophalangeal joint