title: Locking of the metacarpophalangeal joint as a result of the shape of the metacarpal head in achondroplasia.
abstract: A 21 year-old woman with achondroplasia exhibited locking of the metacarpophalangeal joint of the right index finger which required surgery to release the joint. Locking was confirmed to be due to entrapment of the fan-like part of the radial collateral ligament on a metacarpal head prominence arising from epiphysial thickening.
authors.affiliation: Department of Orthopedics, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan. hamada-yoshitaka@umin.ac.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Hamada
authors.forename: K
authors.initials: K
authors.lastname: Sairyo
authors.forename: N
authors.initials: N
authors.lastname: Yasui
mesh_terms: D000130:Achondroplasia / Q000000981:diagnostic imaging* / Q000601:surgery; D000328:Adult; D017885:Collateral Ligaments / Q000000981:diagnostic imaging* / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D008662:Metacarpophalangeal Joint / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000601:surgery; D016059:Range of Motion, Articular / Q000502:physiology; D014057:Tomography, X-Ray Computed