Human Locomotion: Biomechanics of the Lower Extremity
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Questions and Answers

What is the primary function of the Peroneus Longus muscle during gait?

  • To stabilize the medial column against the ground
  • To plantar flex the 1st metatarsal at midstance (correct)
  • To dorsiflex the foot
  • To initiate heel off as the tibia moves over the foot

What type of muscle is the Soleus muscle classified as?

  • Polyphasic
  • Triphasic
  • Biphasic
  • Monophasic (correct)

What is the primary function of muscles during gait, according to the concept of muscle action in gait?

  • To generate force and power
  • To stabilize the body during movement (correct)
  • To control the velocity of movement
  • To move the body from one point to another

What is the criterion for evaluating muscle function during gait, represented by the letter 'F'?

<p>Function of the muscle during the gait cycle (A)</p> Signup and view all the answers

What is the result of limited ankle dorsiflexion, according to the text?

<p>Limited AJ dorsiflexion leads to exaggerated heel strike (B)</p> Signup and view all the answers

What is the primary function of the Posterior Tibialis Muscle during the gait cycle?

<p>To maintain midtarsal joint stability (C)</p> Signup and view all the answers

What is the result of the Soleus Muscle overpowering the Gastrocnemius Muscle in paralysis?

<p>Genu recurvatum (D)</p> Signup and view all the answers

Which muscle is responsible for stabilizing the lesser toes against the ground?

<p>Flexor Digitorum Longus (D)</p> Signup and view all the answers

What is the result of the Flexor Hallucis Longus Muscle overpowering the extensors in iatrogenic situations?

<p>Hallux hammertoe (B)</p> Signup and view all the answers

What is the primary function of the Peroneus Longus Muscle during the gait cycle?

<p>To plantar flex the first ray to allow hallux dorsiflexion (C)</p> Signup and view all the answers

What is the primary function of the Anterior Tibialis Muscle during heel contact?

<p>To hold the foot up to decelerate AJ plantarflexion (D)</p> Signup and view all the answers

What is the result of weakness in the anterior compartment of the lower leg?

<p>Foot drop (D)</p> Signup and view all the answers

What is the primary function of the Peroneus Brevis Muscle during gait?

<p>To act as an antagonist to all muscles that contribute to STJ supination (D)</p> Signup and view all the answers

What is the pathology that may develop due to poor Extensor Digitorum Longus Muscle function?

<p>Foot drop in LMN lesions (B)</p> Signup and view all the answers

During which segment of the gait cycle is the Extensor Digitorum Longus Muscle active?

<p>Last part of swing and during heel contact (A)</p> Signup and view all the answers

What is the primary action of the Extensor Hallucis Longus Muscle during swing?

<p>To dorsiflex the foot during swing (B)</p> Signup and view all the answers

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