Annular Ligament

• Superior Radioulnar Joint - Annular ligament:

  • Creates 4/5 of ring
  • Strong and flexible allowing the oval head to rotate freely

  A) Annular ligament

  B) Superior Radioulnar Joint

  
• Superior Radioulnar Joint - Annular ligament:

  • Attached to anterior and posterior margins of radial notch
  • Superior support is provided by radial collateral ligament (ligament blends with annular ligament & margins of the radial notch)

  A) Annular ligament

  B) Superior Radioulnar Joint

  
• Superior Radioulnar Joint - Annular ligament:

  • Upper part is lined with fibrocartilage continuous with hyaline cartilage of radial notch
  • Lower part is lined with synovial membrane

  A) Annular ligament

  B) Superior Radioulnar Joint

  
• Superior Radioulnar Joint - Annular ligament - Action:

  • Prevents displacement of radial head and stabilises joint

  A) Annular ligament

  B) Superior Radioulnar Joint