Distal radioulnar articulation - wikipedia Distal radioulnar articulation Distal radioulnar articulation Ligaments of wrist. Anterior view. Vertical section through the articulations at the wrist, showing the synovial cavities Details Identifiers Latin Articulatio radioulnaris distalis TA A03. 5.10. 001 FMA 35290 Anatomical terminology ( edit on Wikidata ) The distal radioulnar articulation ( inferior radioulnar joint ) is a joint between the two bones in the forearm ; the radius and ulna. It is one of two joints between the radius and ulna, the other being the proximal radioulnar articulation. The distal radioulnar articulation is the one of the two closest to the wrist and hand. The distal radioulnar articulation pivot - joint formed between the head of ulna and the ulnar notch on the lower extremity of radius. Contents 1 Ligaments 2 Function 3 Injuries 3.1 Estaminet Classification 4 Additional images 5 See also 6 References 7 External links Ligaments The articular surfaces are connected together by the following ligaments : Palmar radioulnar ligament Dorsal radioulnar ligament Articular disk ( triangular fibrocartilage ) Function The function of the radioulnar joint is to lift and maneuver weight load from the distal radioulnar joint to be distributed across the forearm 's radius and ulna as a load - bearing joint. Supination of the radioulnar joint can move from 0 degrees neutral to approximately 80 - 90 degrees where Pronation of the Radioulnar Joint can move from 0 degrees neutral to approximately 70 - 90 degrees. Supination ( palms facing up ) vs. pronation ( palms facing down ). Muscles that contribute to function are all supinator ( Biceps Brachii, Brachioradialis, and Supinator ) and pronator muscles ( Brachioradialis, Pronator Quadratus, and Pronator Teres ). Injuries Injuries to the distal radioulnar articulation often result from falls onto an outstretched hand. Injury can occur with concurrent fracture of the distal radius, the ulna, or can be isolated. A classification system has been proposed by Estaminet and colleagues. Estaminet classification Estaminet classified injuries of the distal radioulnar articulation into four categories with two subclasses : purely ligamentous ( subclass A ) and those with associated boney injury ( subclass B). Estaminet I - Attenuation on MRI only Estaminet II - Volar distal radioulnar ligament is involved. Unstable in supination. Fixation should be in pronation. Estaminet III - Dorsal distal radioulnar ligament is involved. Unstable in pronation. Fixation should be in supination. Estaminet IV - Both ligaments are involved. Unstable in both supination and pronation. Fixation is in neutral. Additional images Distal ends of radius and ulna along with the bones of the wrist and hand Transverse section across distal ends of radius and ulna. See also Proximal radioulnar articulation References This article incorporates text in the public domain from page 325 of the 20th edition of Gray 's Anatomy ( 1918 ) Jump up ^ Lees, V. ( 2013 ). Functional anatomy of the distal radioulnar joint in health and disease. Annals of The Royal College of Surgeons of England, 95 ( 3 ), 163 -- 170. doi : 10.1308 / 003588413X13511609957452 Jump up ^ Thomas, B.P., & Sreekanth, R. ( 2012 ). Distal radioulnar joint injuries. Indian Journal of Orthopaedics, 46 ( 5 ), 493 -- 504. doi : 10.4103 / 0019 - 5413.101031 Jump up ^ Estaminet et al. Estaminet - Klassifikation von distal radioulnar Aussprache - Trauma. 20. Jahresversammlung der europäischen Orthopädischen Forschungsgesellschaft ( EORS 2012 ), am 26 -- 28 September, Amsterdam, Die Niederlande External links elbow / elbowbones / bones5 at the Dartmouth Medical School 's Department of Anatomy Joints and ligaments of the arm Shoulder Sternoclavicular Anterior sternoclavicular Posterior sternoclavicular Interclavicular Costoclavicular Acromioclavicular Syndesmoses : Coracoacromial Superior transverse scapular Inferior transverse of scapula Synovial : Acromioclavicular Coracoclavicular ( trapezoid conoid ) Glenohumeral Capsule Coracohumeral Glenohumeral ( superior, middle, and inferior ) Transverse humeral Glenoid labrum Elbow Humeroradial Radial collateral Humeroulnar Ulnar collateral Proximal radioulnar Anular Oblique cord Quadrate Forearm Distal radioulnar Palmar radioulnar Dorsal radioulnar Interosseous membrane of forearm Hand Wrist / radiocarpal Dorsal radiocarpal / Palmar radiocarpal Dorsal ulnocarpal / Palmar ulnocarpal Ulnar collateral / Radial collateral Intercarpal Midcarpal Radiate carpal Dorsal intercarpal Palmar intercarpal Interosseous intercarpal Scapholunate Pisiform joint ( Pisohamate Pisometacarpal ) Carpometacarpal Dorsal carpometacarpal Palmar carpometacarpal thumb : Radial collateral Ulnar collateral Intermetacarpal Deep transverse metacarpal Superficial transverse metacarpal Metacarpophalangeal Collateral Palmar Interphalangeal Collateral Palmar Other Carpal tunnel Ulnar canal Anatomy portal Retrieved from `` https://en.wikipedia.org/w/index.php?title=Distal_radioulnar_articulation&oldid=835123025 '' Categories : Wikipedia articles incorporating text from the 20th edition of Gray 's Anatomy ( 1918 ) Upper limb anatomy Joints Hidden categories : Pages with unresolved properties All articles with dead external links Articles with dead external links from September 2016 Talk Contents About Wikipedia Deutsch Galego Edit links This page was last edited on 6 April 2018, at 18 : 08 ( UTC ). 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Question: what type of joint is formed between the radius and ulna
Answer: load-bearing joint