Scapholunate ligament complex
Scapholunate
advanced collapse: a pictorial review. Illustration of scapholunate interosseous ligament anatomy. The drawing depicts a slightly oblique, coronal view of the distal radius (R), scaphoid (S) and lunate (L). The scapholunate ligament has been transected to demonstrate its three distinct parts, which include the dorsal (arrowhead), membranous (white arrow) and volar (black arrow) components. Note that the dorsal component is the thickest
The scapholunate ligament complex is a U-shaped ligamentous complex joining the lunate and the scaphoid.
Gross anatomy
It is divided into dorsal, volar and intermediate components with surrounding secondary stabilizers.
Dorsal component
- short, transverse collagen fibers
- 3 mm thick
- blends with joint capsule, scaphotriquetral and intercarpal ligaments
- strongest portion of the complex
- 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
Intermediate/interosseous component
- located proximally and centrally and therefore may be referred to as the central or proximal 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
Related pathology
Siehe auch:
Assoziationen und Differentialdiagnosen zu Ligamentum scapholunatum: