Scapholunate Instability Assessment and Management
Summary
Scapholunate instability arises from disruption of the scapholunate interosseous ligament and associated secondary restraints, leading to abnormal kinematics between the scaphoid and lunate carpal bones. Clinically, patients present with radial-sided wrist pain, mechanical clicking and diminished grip strength, often following a history of trauma. Early recognition is essential to prevent progressive carpal collapse and degenerative arthritis. Assessment begins with a detailed examination of wrist range of motion and provocative manoeuvres, supplemented by standard dorsopalmar, lateral and stress radiographs. Static imaging may reveal widening of the scapholunate gap, altered carpal angles or secondary osteoarthritic changes. Dynamic fluoroscopy and advanced modalities such as real-time MRI, four-dimensional CT and arthroscopic inspection permit functional appraisal of carpal alignment under load. Management strategies span non-operative immobilisation and physiotherapy to surgical repair or reconstruction. Acute tears may be amenable to direct ligament repair and internal bracing, whereas chronic dissociation often requires tendon graft reconstructions or tenodesis procedures to restore stability. Recent advances in image-guided techniques, biomechanical modelling and tissue engineering hold promise for refining both diagnostic precision and long-term outcomes.
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Scapholunate Instability Assessment and Management publication trend
The graph below shows the total number of articles in scapholunate instability assessment and management across all publications each year (not limited to Nature Index journals).
Technical terms
Scapholunate interosseous ligament: The primary intrinsic ligament connecting the scaphoid and lunate bones that maintains carpal stability.
Scapholunate gap: The radiographic distance between the scaphoid and lunate, enlargement of which indicates instability.
Dynamic instability: Carpal misalignment that becomes apparent only during active motion or under load, often requiring fluoroscopy or dynamic MRI for detection.
Tenodesis: A surgical reconstruction technique using tendon grafts to stabilise the scapholunate joint by re-routing and securing soft tissue across the carpus.
Carpal arc interruption: A discontinuity in the smooth curve formed by the proximal carpal row on radiographs, signalling potential ligamentous disruption.
References
- Evaluation of a newly designed deep learning-based algorithm for automated assessment of scapholunate distance in wrist radiography as a surrogate parameter for scapholunate ligament rupture and the correlation with arthroscopy. La radiologia medica (2023).
- Artificial intelligence for automated detection and measurements of carpal instability signs on conventional radiographs. European Radiology (2024).
- Biomechanical Comparisons of Different Reconstructive Techniques for Scapholunate Dissociation: A Cadaveric Study. Bioengineering (2023).
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