Articulating Surfaces

Question 1

Describe the acetabulum

Answer 1

• Hemi-spherical fossa facing lat/ant/inf
• Formed by fusion of ischium/pubis/ilium
• Contains horse-shoe shaped lunate articular surface
• Covered in Hyaline cartilage (thickest superiorly)
• Central section = non-articular - ligamentum teres
• Rim = incomplete inferiorly (notch) transverse ligament
• Deepened by fibrocartilaginous labrum - deepens fossa - also defective in inferior aspect.

Question 2

Describe the Head of femur

Answer 2

• Ball/spherical shaped head
• Carried on oblique femoral neck = ~125 degrees
• Facing post/med/sup
• Covered in hyaline cartilage - thickest superiorly (except for fovea capitis which is posteromedial attachment site for ligamentum teres)