title: [Biomechanics of the joints of the large toe. Shape and movement of the first tarsometatarsal joint and of the medial cuneonavicular joint].
abstract: 90% of the first (hallucal) tarsometatarsal joints are screw-shaped; the axis is directed upwards to the front touching the lateral edge of the joint. Thus the plantar flexion is inevitably accompanied by an adduction and a pronation, and vice versa a dorsiflexion is consequently accompanied by an abduction and a supination, when the articular surfaces exactly slide along each other. 10% of these joints, however, are ellipsoid-shaped; in this case the distal articular surface of the medial cuneiform bone has the form of an ovoid head, and a strong ligament situated next to the lateral edge of the joint effects the same kind of motion described above. The medial cuneonavicular joint is always ellipsoid-shaped, the head of which is made up by the medial facet of the distal articular surface of the navicular bone. Each of the two joints mentioned has a considerable range of mobility.
authors.affiliation: Anatomisches Institut der Universität Graz, Osterreich.
authors.forename: R
authors.initials: R
authors.lastname: Reimann
authors.forename: S
authors.initials: S
authors.lastname: Marlovits
mesh_terms: D001696:Biomechanical Phenomena; D001842:Bone and Bones / Q000033:anatomy & histology / Q000502:physiology; D006801:Humans; D008683:Metatarsophalangeal Joint / Q000033:anatomy & histology* / Q000502:physiology; D008954:Models, Biological; D009068:Movement / Q000502:physiology*; D014033:Toe Joint / Q000033:anatomy & histology* / Q000502:physiology; D014034:Toes
vernacular_title: Biomechanik des Grosszehenbogens. Form- und Bewegungsanalyse der Articulatio tarsometatarsalis hallucis und der Articulatio cuneonavicularis medialis.