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Human Locomotion: Biomechanics of the Lower Extremity

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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'?

Function of the muscle during the gait cycle Signup and view all the answers

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

Limited AJ dorsiflexion leads to exaggerated heel strike Signup and view all the answers

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

To maintain midtarsal joint stability Signup and view all the answers

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

Genu recurvatum Signup and view all the answers

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

Flexor Digitorum Longus Signup and view all the answers

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

Hallux hammertoe Signup and view all the answers

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

To plantar flex the first ray to allow hallux dorsiflexion Signup and view all the answers

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

To hold the foot up to decelerate AJ plantarflexion Signup and view all the answers

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

Foot drop Signup and view all the answers

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

To act as an antagonist to all muscles that contribute to STJ supination Signup and view all the answers

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

Foot drop in LMN lesions Signup and view all the answers

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

Last part of swing and during heel contact Signup and view all the answers

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

To dorsiflex the foot during swing Signup and view all the answers