University
Mohamed Sobhy
The Hip
Quick Guide
Anatomy and Biomechanics
Osteonecrosis
Arthritis
Miscellaneous conditions
Arthroplasty
,
, 1
Hip Anatomy & Biomechanics
Type
Ball and socket synovial joint
Os Coxae = the hip bone (Ilium + pubis +
ischium)
Krause’s bone: small bone (2ry ossific center)
in the triradiate cartilage bet ilium, ischium, and
pubis
Acetabulum
• Bony cavity faces obliquely:
o Forward ...................................... 12º from sagittal plane
o Outward ..........................................
o Downward ................................ 60º from axial plane (labrum make this angle 45-50º)
• A line through the circumference is at 40º opening posteriorly from the sagittal plane and at
60º from the coronal (horizontal) plane
Femoral head
• Forms 2/3 of a sphere
• Articular surface is thicker on the mediocentral part and thinnest on the periphery
, • The Joint reaction force usually acts on the superior quadrant