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Distal radioulnar articulation

August 25, 2023

The distal radioulnar articulation[1] (also known as the distal radioulnar joint,[2] or inferior radioulnar joint[1][3]) is a synovial pivot 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 joint features an articular disc, and is reinforced by the palmar and dorsal radioulnar ligaments.[1][3]

Distal radioulnar articulation
Ligaments of wrist. Anterior view.
Vertical section through the articulations at the wrist, showing the synovial cavities
Details
SynonymsDistal radioulnar joint (DRUJ)
Identifiers
LatinArticulatio radioulnaris distalis
TA98A03.5.10.001
TA21781
FMA35290
Anatomical terminology
[edit on Wikidata]

Structure Edit

The distal radioulnar articulation is formed by the head of ulna, and the ulnar notch of the distal radius.[3][1]

Articular disc Edit

The joint features a triangular articular disc that is attached to the inferior margin of the ulnar notch by its base, and to a fossa at the base of the styloid process of the ulna by its apex.[3] The articular disc acts to firmly bind the distal extremities of the two bones together.[1]

Ligaments Edit

The articulation is reinforced by the palmar radioulnar ligament, and dorsal radioulnar ligament.[1]

Function Edit

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.[4] 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.[5] 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 peres).

Clinical significance Edit

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. For the upper limit of the distal radioulnar distance, sources vary between 2 mm[6] and 5 mm.[7] A classification system has been proposed by Estaminet and colleagues.[8]

Estaminet Classification Edit

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 Edit

See also Edit

References Edit

  1. ^ a b c d e f Gray, Henry (1918). Gray's Anatomy (20th ed.). p. 326.
  2. ^ Dyan V. Flores,Darwin Fernández Umpire, Kawan S. Rakhra, Zaid Jibri, Gonzalo A. Serrano Belmar (18 Nov 2022). "Distal Radioulnar Joint: Normal Anatomy, Imaging of Common Disorders, and Injury Classification". Radiographics. 43 (1): e220109. doi:10.1148/rg.220109. PMID 36399415. S2CID 253627145.{{cite journal}}: CS1 maint: uses authors parameter (link)
  3. ^ a b c d Last's anatomy : regional and applied. Chummy S. Sinnatamby, R. J.. Last (12th ed.). Edinburgh. 2011. p. 72. ISBN 978-0-7020-4839-5. OCLC 764565702.{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: others (link)
  4. ^ 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
  5. ^ Thomas, B. P., & Sreekanth, R. (2012). Distal radioulnar joint injuries. Indian Journal of Orthopaedics, 46(5), 493–504. doi:10.4103/0019-5413.101031
  6. ^ Jack A Porrino, Jr, MD; Chief Editor: Felix S Chew (15 March 2022). "Distal Radial Fracture Imaging". Medscape. {{cite journal}}: |author= has generic name (help)CS1 maint: multiple names: authors list (link) Updated: Aug 14, 2018
  7. ^ Page 341 in: Richard A. Berger, Arnold-Peter C. Weiss (2004). Hand Surgery, Volumes 1-2. Lippincott Williams & Wilkins. ISBN 9780781728744.
  8. ^ 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 Edit

  • Dartmouth Anatomy

August 25, 2023
distal, radioulnar, articulation, distal, radioulnar, articulation, also, known, distal, radioulnar, joint, inferior, radioulnar, joint, synovial, pivot, joint, between, bones, forearm, radius, ulna, joints, between, radius, ulna, other, being, proximal, radio. The distal radioulnar articulation 1 also known as the distal radioulnar joint 2 or inferior radioulnar joint 1 3 is a synovial pivot 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 joint features an articular disc and is reinforced by the palmar and dorsal radioulnar ligaments 1 3 Distal radioulnar articulationLigaments of wrist Anterior view Vertical section through the articulations at the wrist showing the synovial cavitiesDetailsSynonymsDistal radioulnar joint DRUJ IdentifiersLatinArticulatio radioulnaris distalisTA98A03 5 10 001TA21781FMA35290Anatomical terminology edit on Wikidata Contents 1 Structure 1 1 Articular disc 1 2 Ligaments 2 Function 3 Clinical significance 3 1 Estaminet Classification 4 Additional images 5 See also 6 References 7 External linksStructure EditThe distal radioulnar articulation is formed by the head of ulna and the ulnar notch of the distal radius 3 1 Articular disc Edit The joint features a triangular articular disc that is attached to the inferior margin of the ulnar notch by its base and to a fossa at the base of the styloid process of the ulna by its apex 3 The articular disc acts to firmly bind the distal extremities of the two bones together 1 Ligaments Edit The articulation is reinforced by the palmar radioulnar ligament and dorsal radioulnar ligament 1 Function EditThe 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 4 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 5 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 peres Clinical significance EditInjuries 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 For the upper limit of the distal radioulnar distance sources vary between 2 mm 6 and 5 mm 7 A classification system has been proposed by Estaminet and colleagues 8 Estaminet Classification Edit 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 Edit 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 EditProximal radioulnar articulationReferences Edit a b c d e f Gray Henry 1918 Gray s Anatomy 20th ed p 326 Dyan V Flores Darwin Fernandez Umpire Kawan S Rakhra Zaid Jibri Gonzalo A Serrano Belmar 18 Nov 2022 Distal Radioulnar Joint Normal Anatomy Imaging of Common Disorders and Injury Classification Radiographics 43 1 e220109 doi 10 1148 rg 220109 PMID 36399415 S2CID 253627145 a href Template Cite journal html title Template Cite journal cite journal a CS1 maint uses authors parameter link a b c d Last s anatomy regional and applied Chummy S Sinnatamby R J Last 12th ed Edinburgh 2011 p 72 ISBN 978 0 7020 4839 5 OCLC 764565702 a href Template Cite book html title Template Cite book cite book a CS1 maint location missing publisher link CS1 maint others link 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 Thomas B P amp Sreekanth R 2012 Distal radioulnar joint injuries Indian Journal of Orthopaedics 46 5 493 504 doi 10 4103 0019 5413 101031 Jack A Porrino Jr MD Chief Editor Felix S Chew 15 March 2022 Distal Radial Fracture Imaging Medscape a href Template Cite journal html title Template Cite journal cite journal a author has generic name help CS1 maint multiple names authors list link Updated Aug 14 2018 Page 341 in Richard A Berger Arnold Peter C Weiss 2004 Hand Surgery Volumes 1 2 Lippincott Williams amp Wilkins ISBN 9780781728744 Estaminet et al Estaminet Klassifikation von distal radioulnar Aussprache Trauma 20 Jahresversammlung der europaischen Orthopadischen Forschungsgesellschaft EORS 2012 am 26 28 September Amsterdam Die NiederlandeExternal links EditDartmouth Anatomy Portal Anatomy Retrieved from https en wikipedia org w index php title Distal radioulnar articulation amp oldid 1164883733, wikipedia, wiki, book, books, library,

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