Transcript F. Lower Extremities - Crestwood Local Schools

F. Lower Extremities
1. Composed of 60 bones
2. Femur- thigh bone is the longest,
heaviest, and strongest bone in the body
a. Articulates with the hipbone
and the tibia
b. Angles medially as approaches
opposite thigh
c. Head of proximal end
articulates with the acetabulum of
the hip
1. Sits on a neck which is
commonly fractured in the
elderly
d. Body has a vertical ridge called
the linea aspera for muscle attachment
e. Distal end has a lateral and medial
condyle
1. The two form the condylar
fossa
3. Patella- knee cap, is a small
triangular bone located anterior to the
knee joint
a. Broad end is the base, point is
the apex
b. Posterior surface has two
articular facets to increase leverage
on the tendons of the quadriceps
4. Tibia- larger, medial bone that bears
the body’s weight
a. Shin bone
b. Has lateral and medial condyles
which connect to the femur
1. The inferior surface of the
lateral condyle holds the
fibula
c. Distally the medial malleoulus
articulates with the ankle
5. Fibula- considerably smaller lateral
bone of the lower leg
a. Head attaches to the tibia,
lateral malleolus attached to the
ankle
1. Forms bump o the lateral
surface of the ankle
b. Fracture of the lower fibula
harming the articulation with the
tibia is a Pott’s fracture