Stability of the transverse carpal arch: an experimental study

Area of Science:

• Orthopedics
• Biomechanics
• Anatomy

Background:

• The transverse carpal arch is a critical anatomical structure in the wrist.
• Understanding its mechanical properties is essential for diagnosing and treating carpal tunnel syndrome and other wrist conditions.

Purpose of the Study:

• To investigate the mechanical characteristics of the transverse carpal arch.
• To analyze the tensile properties of the ligaments contributing to its stability.
• To determine the role of the flexor retinaculum and transverse intercarpal ligaments in maintaining carpal arch integrity.

Main Methods:

• Mechanical testing of fresh-frozen human cadaveric wrists.
• Tensile property analysis of involved ligaments.
• Assessment of carpal arch stiffness after division of the flexor retinaculum.

Main Results:

• Division of the flexor retinaculum resulted in only a minor average reduction (7.5%) in transverse carpal arch stiffness.
• Transverse intercarpal ligaments demonstrated a crucial role in stabilizing the carpal tunnel.
• Ligaments connecting the distal carpal row bones are key to carpal tunnel stability.

Conclusions:

• The flexor retinaculum is not the primary stabilizer of the transverse carpal arch.
• Transverse intercarpal ligaments are essential for maintaining carpal tunnel stability.
• This finding has implications for understanding wrist biomechanics and surgical interventions.