Dorsal radioulnar ligament
- location: extending from posterior margin of the ulnar notch at the distal radius to the posterior portion of the head of the ulna
- blood supply: palmar and dorsal branches of the anterior interosseous artery
- innervation: anterior and posterior interosseous nerve
- relations: volar radioulnar ligament
Along with the volar radioulnar ligament, the dorsal radioulnar ligament forms one of the primary soft tissue stabilizers of the distal radioulnar joint 1. There are deep and superficial divisions which can be considered as separate laminae and attach into the fovea and ulna styloid respectively 2.
The distal radioulnar joint articulation is formed by the ulnar seat 3 and the medial articular facet (sigmoid notch) of the radius 1. The semicylindrical and convex shape of the ulna head coupled with the heterogeneously concave sigmoid notch contribute to the propensity for joint instability 1.
The dorsal radioulnar ligament is intimately related to the volar radioulnar ligament. During pronation the volar ligament becomes progressively lax while the dorsal ligament tightens and the converse occurs during supination 4.
The general blood supply to the distal radioulnar joint is via the palmar and dorsal branches of the anterior interosseous artery 5. At the proximal border of the pronator quadratus the branches arborize to supply the capsule in addition to the palmar, medial and dorsal sides of the articular disc while the central portion of the disc is avascular 5.
Drainage occurs via veins that correspond to the named arteries.
- 1. Thomas BP, Sreekanth R. Distal radioulnar joint injuries. (2012) Indian journal of orthopaedics. 46 (5): 493-504. doi:10.4103/0019-5413.101031 - Pubmed
- 2. Murray D, Javed S, Hayton M. Mini dorsal incision to the triangular fibrocartilage complex: a new surgical approach. (2015) Hand (New York, N.Y.). 10 (4): 717-20. doi:10.1007/s11552-015-9748-9 - Pubmed
- 3. Hyams E, Yazaki N, Nakamura R, Nakao E, Watanabe K. Radiographic morphology of the ulnar head. (2004) Hand surgery : an international journal devoted to hand and upper limb surgery and related research : journal of the Asia-Pacific Federation of Societies for Surgery of the Hand. 9 (2): 175-80. Pubmed
- 4. Ward LD, Ambrose CG, Masson MV, Levaro F. The role of the distal radioulnar ligaments, interosseous membrane, and joint capsule in distal radioulnar joint stability. (2000) The Journal of hand surgery. 25 (2): 341-51. doi:10.1053/jhsu.2000.jhsu25a0341 - Pubmed
- 5. Mikić Z. The blood supply of the human distal radioulnar joint and the microvasculature of its articular disk. (1992) Clinical orthopaedics and related research. Pubmed