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Hip Arthrology
The acetabulum is
located at the fusion
of 3 bones:
– Ilium
– Ischium
– Pubis
The acetabulum has a
true hemisphere but
only a horse shoe like
portion has articular
cartilage
The inner surface of the
acetabulum is called
the acetabular fossa
Type: Diarthroidal Ball-Socket
Degrees of Freedom: 3° of freedom
Motions:
Abduction &
Adduction
Medial & Lateral
Rotation
Flexion &
Extension
The acetabulum labrum is a fibrocartilagenous
structure that deepens the acetabulum
The acetabulum labrum
has the following
functions:
• Deepens the acetabulum
• Grasps the head of the
femur
• Helps in the stability of the
hip by keeping the femur
in the acetabulum
Head of Femur
Ranges from larger
than true
hemisphere to
almost 2/3 of a
sphere
Head of Femur
Completely covered with articular cartilage
except small central surface called fovea
with cartilage thick in the medial section
Fovea
Femoral neck
Anatomical
Surgical
Small cylindrical piece of
bone 5cm long
Projects anteriorly,
medially, and superiorly
Femur Shaft
• The abducted
position of the
femoral shaft in
relation to the
femoral head and
neck places the
lower extremities
in a parallel
position during
erect standing
Femur Shaft
• Medial rotation of
the femoral shaft
brings the femoral
condyles into
forward facing
position