Patella & Clavicle😍

  • Sesamoid bone
    • Bone within a tendon
    • Examples
      • Patella: quadriceps tendon
      • Pisiform: Flexor carpi ulnaris
  • Triangular
    • Base: Superior
    • Apex: Inferior
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Posterior Surface

  • Upper: Articular facets
  • Lower: Non-articular
  • Lateral facet larger
  • Lateral femoral surface deeper → prevents lateral displacement
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Bursae

  • Suprapatellar
  • Prepatellar
    • Housemaid’s knee
  • Infrapatellar
    • Clergyman’s knee
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      Clavicle

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  • Only horizontal long bone

Ossification

  • Membranous ossification
    • except medial end
  • 2 primary + 1 secondary centres

Fracture Site

  • Most common: junction of medial 2/3 and lateral 1/3
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Muscle Attachments

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  • Pectoralis major: Anterior medial 2/3
  • SCM: Superior medial 2/3
  • Deltoid: Anterior lateral 1/3
  • Trapezius: Posterior lateral 1/3
  • Subclavius: Subclavian groove (inferior surface)

Ligament Attachments

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  • Coracoclavicular ligament: Conoid tubercle + trapezoid ridge
  • Costoclavicular ligament: Inferior medial end
  • Interclavicular ligament: Superior medial border
  • SC joint capsule: Medial end
  • SC disc: Posterosuperior medial border
  • AC joint capsule: Lateral end