Scapholunate Ligament
Description
Name
- Scapholunate ligament Complex
- Scapholunate Ligament (SLL)
- Scapholunate Interosseous Ligament (SLIL)
- SL ligament
- Scapho-lunate ligament
- Scapholunate joint ligament
- Interosseous scapholunate ligament
General
- U-shaped or C-shaped ligament which between the scaphoid, lunate bones[4]
- Stabilizes the Scapholunate Joint
- 3 distinct components: dorsal, volar (palmer) and proximal
Dorsal Component
- Short, transverse collagen fibers
- Blends with joint capsule, scaphotriquetral and intercarpal ligaments
- Strongest portion of the complex (3 mm thick, 5 mm long)
- Controls flexion/extension
- Complete defect is usually symptomatic
Volar Component
- Oblique collagen fibers (1 mm thick)
- Blends with extrinsic volar radioscapholunate ligament
- Controls rotational motion
- Major proprioceptive role
Proximal/Intermediate/Interosseous Component
- Fibrocartilage, sparse neurovascular supply
- Weakest portion of the complex
- Extends a few millimeters into the joint, akin to a meniscus
- Often asymptomatic when torn in isolation
- Usually tears at the scaphoid attachment
Secondary stabilizers
- Scapho-trapezial-trapezoidal ligament
- Radio-scapho-capitiate ligament
Actions
- Stabilize the Scapholunate Joint
Vascular Supply
- Branches of the Radial Artery[2]
Innervation
- Terminal branches of the[5]
Clinical Significance
- Scapholunate Instability
- Scapholunate Joint Injection
- Dorsal Intercalated Segmental Instability (DISI)
- Scapholunate Advanced Collapse (SLAC)
See Also
References
- ↑ Image courtesy of radsource.us, "SLL Tear and DISI Deformity"
- ↑ 2.0 2.1 Andersson, Jonny K. "Treatment of scapholunate ligament injury: current concepts." EFORT Open reviews 2.9 (2017): 382-393.
- ↑ Abbott, Sarah, Alex Hunt, and Shamim Umarji. "Scapholunate ligament injuries: an instructional review for the FRCS examination." European Journal of Orthopaedic Surgery & Traumatology 33.8 (2023): 3729-3733.
- ↑ Rajan, Prashant V., and Charles S. Day. "Scapholunate interosseous ligament anatomy and biomechanics." The Journal of hand surgery 40.8 (2015): 1692-1702.
- ↑ Salva-Coll, Guillem, Marc Garcia-Elias, and Elisabet Hagert. "Scapholunate instability: proprioception and neuromuscular control." Journal of wrist surgery 2.02 (2013): 136-140.