title: The Dorsal Triangular Fibrocartilage of the Metacarpophalangeal Joint: A Cadaveric Study.
abstract: OBJECTIVE
  To describe a fibrocartilaginous structure on the dorsal surface of the metacarpophalangeal (MCP) joint.
  
  
  METHODS
  A combination of anatomical dissection, histology, ultrasound, and magnetic resonance imaging was undertaken to explore the anatomical structure described, with clinical correlation undertaken by surgical exploration of MCP joints.
  
  
  RESULTS
  A dorsal structure of the MCP joint was identified as fibrocartilagenous in composition, triangular in shape, and-together with the volar plate and collateral and accessory collateral ligaments-forming a deepened dorsal fossa in which the metacarpal head invaginated. It was attached to the extensor tendon by loose connective tissue and formed part of the joint capsule.
  
  
  CONCLUSIONS
  The dorsal fibrocartilage of the MCP joint is a constant anatomical structure that appears to complement the structural support for the metacarpal head and extensor tendon. Possible functions include stabilization of the extensor tendon, formation of a dorsal fossa, prevention of extensor tendon attrition, and synovial fluid production. Its structure and function may have implications in future development of joint replacement devices.
  
  
  CONCLUSIONS
  This study adds to the collective knowledge about the precise anatomy of the MCP joint. Reconstructive surgery and, in particular, joint replacement surgery should consider the potential function and importance of this structure when designing interventions on the joint.
authors.affiliation: Department of Plastic and Reconstructive Surgery, Frankston Hospital, Frankston, Victoria, Australia; Department of Surgery, Monash University, Clayton, Victoria, Australia; Monash University Plastic and Reconstructive Surgery Unit (Peninsula Clinical School), Frankston, Victoria, Australia. Electronic address: david.hunter-smith@monash.edu.
authors.forename: David J
authors.initials: DJ
authors.lastname: Hunter-Smith
authors.affiliation: Department of Plastic and Reconstructive Surgery, Frankston Hospital, Frankston, Victoria, Australia; Department of Surgery, Monash University, Clayton, Victoria, Australia; Monash University Plastic and Reconstructive Surgery Unit (Peninsula Clinical School), Frankston, Victoria, Australia.
authors.forename: Philip G
authors.initials: PG
authors.lastname: Slattery
authors.affiliation: Department of Plastic and Reconstructive Surgery, Frankston Hospital, Frankston, Victoria, Australia.
authors.forename: Alexandra
authors.initials: A
authors.lastname: Rizzitelli
authors.affiliation: Department of Plastic and Reconstructive Surgery, Frankston Hospital, Frankston, Victoria, Australia; Department of Surgery, Monash University, Clayton, Victoria, Australia; Monash University Plastic and Reconstructive Surgery Unit (Peninsula Clinical School), Frankston, Victoria, Australia.
authors.forename: Sarah R
authors.initials: SR
authors.lastname: Hunter-Smith
authors.affiliation: Department of Plastic and Reconstructive Surgery, Frankston Hospital, Frankston, Victoria, Australia; Department of Surgery, Monash University, Clayton, Victoria, Australia; Monash University Plastic and Reconstructive Surgery Unit (Peninsula Clinical School), Frankston, Victoria, Australia.
authors.forename: Sian
authors.initials: S
authors.lastname: Fairbank
authors.affiliation: Department of Plastic and Reconstructive Surgery, Frankston Hospital, Frankston, Victoria, Australia; Department of Surgery, Monash University, Clayton, Victoria, Australia; Monash University Plastic and Reconstructive Surgery Unit (Peninsula Clinical School), Frankston, Victoria, Australia.
authors.forename: Warren Matthew
authors.initials: WM
authors.lastname: Rozen
authors.affiliation: Department of Plastic and Reconstructive Surgery, Frankston Hospital, Frankston, Victoria, Australia; Department of Surgery, Monash University, Clayton, Victoria, Australia; Monash University Plastic and Reconstructive Surgery Unit (Peninsula Clinical School), Frankston, Victoria, Australia.
authors.forename: Michael W
authors.initials: MW
authors.lastname: Findlay
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002102:Cadaver; D004210:Dissection; D006801:Humans; D008279:Magnetic Resonance Imaging; D008662:Metacarpophalangeal Joint / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D008875:Middle Aged; D051478:Triangular Fibrocartilage / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D014463:Ultrasonography
keywords: Dorsal cartilage; extensor apparatus; hand anatomy; metacarpophalangeal joint; volar plate