The scaphotrapezial ligament complex: an anatomic and biomechanical study

Area of Science:

• Orthopedics
• Anatomy
• Biomechanics

Background:

• The scaphotrapezial joint is crucial for wrist function.
• Understanding its ligamentous stabilizers is key to diagnosing and treating wrist pathologies.

Purpose of the Study:

• To anatomically identify and biomechanically assess the ligamentous stabilizers of the scaphotrapezial joint.
• To elucidate the role of these ligaments in joint stability.

Main Methods:

• Anatomic dissection of 25 fresh cadaveric wrist specimens.
• Biomechanical testing to evaluate the function of identified ligamentous structures.

Main Results:

• A consistent scaphotrapezial ligament complex was identified, comprising four distinct entities.
• This complex includes a stout scaphotrapezial ligament, weak palmar and dorsal capsules, and a scaphocapitate capsular ligament.
• These structures were found to resist diastasis (separation) of the scaphotrapezial joint.

Conclusions:

• The identified scaphotrapezial ligament complex is vital for scaphotrapezial joint stability.
• This anatomical and biomechanical knowledge is pertinent to scaphoid tuberosity fractures, scaphotrapezial instability and arthrosis, scaphoid dislocations, and scapholunate disassociations.