Quadrate Ligament

• Superior Radioulnar Joint - Quadrate Ligament:

  Origin:

  • Lower border of radial notch of the ulna

  A) Quadrate Ligament

  B) Superior Radioulnar Joint

  
• Superior Radioulnar Joint - Quadrate Ligament:

  Insertion:

  • Adjacent medial surface of neck of radius proximal to radial tuberosity

  A) Quadrate Ligament

  B) Superior Radioulnar Joint

  
• Superior Radioulnar Joint - Quadrate Ligament:

  • Fibres run in a crisscross orientation meaning that in any position of pronation or supination some fibres are under tension
  • There is then an overall constant tension in ligament in all positions

  A) Quadrate Ligament

  B) Superior Radioulnar Joint

  
• Superior Radioulnar Joint - Quadrate Ligament - Action:

  • Limits both pronation and supination

  A) Quadrate Ligament

  B) Superior Radioulnar Joint