Scapholunate stabilization with dynamic extensor carpi radialis longus tendon transfer.

Area of Science:

• Orthopedic Surgery
• Biomechanics
• Hand Surgery

Background:

• Scapholunate interosseous ligament (SLIL) injuries disrupt wrist biomechanics, leading to instability and pain.
• Traditional treatments like capsulodesis and tenodesis have limitations in restoring natural wrist motion.
• Dynamic scapholunate instability requires dynamic stabilization to restore the scaphoid's slider-crank mechanism.

Observation:

• The extensor carpi radialis longus (ECRL) tendon transfer to the scaphoid mimics a dorsal radioscaphoid ligament.
• This dynamic transfer aims to replicate normal viscoelastic forces during wrist motion.
• ECRL transfer can act synchronously and synergistically with existing wrist movements.

Findings:

• ECRL transfer alone may suffice for partial SLIL tears with dynamic scapholunate instability, supporting normal kinematics.
• For static instability, ECRL transfer improves carpal congruity but requires concurrent SLIL and dorsal lunate ligament repair for durable results.
• The procedure offers a simpler alternative to capsulodesis/tenodesis, avoiding intercarpal fixation and allowing faster rehabilitation.

Implications:

• ECRL tendon transfer presents a viable, less invasive option for managing SLIL injuries and associated wrist instability.
• This technique holds potential for improving patient outcomes and accelerating recovery in specific wrist injury cases.
• Further research can explore long-term efficacy and optimal patient selection for ECRL transfer in wrist reconstruction.