POSTERIOR COMPARTMENT MA

Question 1

Flex knee and lift heel, assist in decelerating internal

rotation and supination of the STJ, supinator of the STJ and MTJ

Answer 1

Gastrocnemius Muscle

Question 2

Stabilizer of the lateral column by exerting a PF force.

Answer 2

Soleus Muscle

Question 3

STJ supinator (most important STJ supinator)

Functions early in contact because it can work as soon as 5th met touches the ground

Serves to decelerate STJ pronation and internal leg rotation during contact (with help from soleus)

Accelerates STJ supination and external leg rotation during midstance (assisted by soleus and long digital flexors)

Answer 3

Tibialis Posterior Muscle

Question 4

No GRF on hallux until end of contact

Maintains stability of hallux against ground during propulsion (primary role)

Answer 4

Flexor Hallucis Longus Muscle

Question 5

Begins function slightly before FHL because lesser digits contacts ground first

Applies posterior compression on phalanges of lesser digits against met heads during midstance and propulsion

Good supinator (plantarflexor and adductor) of forefoot relative to rearfoot

Answer 5

Flexor Digitorum Longus Muscle