New findings about the intrascaphoid arterial system

Area of Science:

• Orthopedic Surgery
• Anatomy
• Radiology

Background:

• The scaphoid bone is crucial for wrist function.
• Scaphoid fractures are common and prone to nonunion.
• Understanding its vascular supply is vital for treatment.

Purpose of the Study:

• To investigate the intraosseous arterial supply of the scaphoid bone.
• To elucidate the relationship between vascular patterns and fracture nonunion risk.

Main Methods:

• Utilized red lead injection in six cadaveric scaphoids.
• Employed micro-computed tomography for 3D reconstruction of arteries.

Main Results:

• Arterial entrances identified around the dorsal ridge and ligament insertions.
• The dorsal ridge is a significant supply source for proximal, waist, and distal scaphoid.
• Approximately 40% of the proximal scaphoid exhibited poor blood supply.

Conclusions:

• The intrascaphoid arterial pattern, particularly poor supply to the proximal pole, may contribute to nonunion in scaphoid fractures.
• The dorsal ridge's vascular contribution is critical for scaphoid viability.