MAJOR EVENTS MIDSTANCE PERIOD

Question 1

Acceleration
of STJ Supination
and External Leg Rotation

Answer 1

Posterior calf muscles are agonists and accelerate STJ supination and external leg rotation

Gastrocnemius accelerates external rotation of the femur

During the last half of midstance the Fibularis Longus and Fibularis Brevis function as antagonists to the
calf muscles

Question 2

Deceleration of Forward Momentum
of the Tibia and Knee
Extension

Answer 2

Muscles that decelerate are the Tibialis posterior, Soleus, Flexor Digitorum Longus, Flexor Hallucis Longus with some help from the Fibularis Longus

Gastrocnemius maintains flexion tension at the knee

Question 3

Stabilization of the Bones of the Lesser

Tarsus

Answer 3

Early in midstance - Soleus, Tibialis Posterior, Fibularis Longus and Fibularis Brevis are responsible

Question 4

Stabilization of the Metatarsus - 1st ray

Answer 4

Fibularis Longus

Abductor Hallucis and Flexor Hallucis Brevis

Question 5

Stabilization
of the Metatarsus -
2nd, 3rd, 4th rays

Answer 5

• Flexor Digitorum Longus and Tibialis Posterior
• Fibularis Longus and Tibialis Posterior
• Soleus