Twenty Questions on Carpal Instability

Wrist Anatomy and Biomechanics

“…2). 8 Radioscaphocapitate ligament: The radioscaphocapitate ligament originates proximally from the radial styloid process to the volar edge of the distal radius at the level of the scaphoid fossa (Fig. 2).…”

“…Located between the long radiolunate ligament and radioscaphocapitate ligaments, at the level of the midcarpal joint, is an area of capsular weakness known as the space of Poirier. 8 Short radiolunate ligament: The short radiolunate ligament originates proximally from the ulnar and volar edge of the lunate fossa of the distal radius (Fig. 2).…”

When can a professional athlete return to play following scapholunate ligament delayed reconstruction?

“…A normal posterioranteror radiograph has a scapholunate gap of less than 3 mm, with an abnormal static radiograph has a gap greater than 3 mm. Abnormal dynamic radiographs will have an asymmetrical gap compared to the other wrist 13. The dynamic or flexible static instability is amenable to soft tissue-based procedures while the surgical treatment of fixed static instability is limited to bony procedures.…”

Radiographic Signs of Static Carpal Instability With Distal End Radius Fractures: Is Current Treatment Adequate?

“…All distal end radius fractures were classified as Type A (extraarticular), Type B (simple intra-articular) or Type C (complex intra-articular) according to the Association for Osteosynthesis/ Association for the Study of Internal Fixation (AO/ASIF) Classification for distal radius fractures. 17 We deferred sub-classification of fractures as per the AO/ASIF system due to its limited applicability in this study.…”