Abstract
Background Tears of the dorsal radiocarpal capsule at the level of the scapholunate interosseous
ligament (SLIL) have recently been described in association with predynamic scapholunate
instability.
Purpose The aim of this anatomical study of the dorsal capsulo-scapholunate septum (DCSS)
was to examine the connection of the dorsal capsule on the SLIL and dorsal intercarpal
ligament (DICL).
Methods Fourteen fresh frozen wrists from seven adult cadavers were dissected through a dorsal
approach. Any dorsal attachment of the DICL on the dorsal surface of the SLIL, that
is, the DCSS, was identified and measured (height and width).
Results The DCSS was consistently found connecting the DICL, the dorsal radiocarpal capsule,
and the dorsal aspect of the SLIL. It was formed by the confluence of three arches
like intersecting ribs in gothic architecture. The mean dimensions of the DCSS were
5.8 mm in height and 4.0 mm in maximum width.
Conclusion The DCSS that connects the SLIL with the dorsal capsule and DICL could be a constant
structure of dorsal wrist. Further investigation is required to study the histology
of the DCSS and its biomechanical properties in isolation to know whether the DCSS
can be considered a secondary stabilizer of the scapholunate ligament complex.
Clinical Relevance A better anatomical knowledge of scapholunate ligament complex could help understand
and manage instability of the wrist.
Keywords
dorsal capsulo-scapholunate septum - dorsal wrist capsule - scapholunate instability
- scapholunate ligament
