482.A 12-year-old boy is brought to the emergency room by his mother
following being pushed out of the neighbor’s tree house, about 10 ft off the
ground. He can walk but his right heel hurts every time he puts weight on
it. When you examine his foot it is tender to pressure on both the medial
and lateral aspects of the heel inferior to the tibia. You order plain films of
his right lower extremity because you suspect he has fractured which of the
following?
a. Calcaneus
b. Fibula
c. Tibia
d. Navicular
e. Cuneiform
483.The process of unlocking the fully extended knee in preparation for
flexion requires initial contraction of which of the following?
a. Gastrocnemius, soleus, and plantaris muscles
b. Hamstring muscles
c. Popliteus muscle
d. Quadriceps femoris muscle
e. Sartorius muscle and short head of the biceps femoris muscle
Extremities and Spine 577