COC Anatomy & Biomechanics 3

Question 1

Which of the following best describes the moment arm for the Achilles tendon at the ankle joint?

Accepted Answer

The perpendicular distance from the ankle axis to the line of tendon force

Answer

The length of the Achilles tendon from calcaneus to muscle belly

Answer

The vertical height of the calcaneal tuberosity

Answer

The distance between the ankle and the metatarsal heads

Question 2

In a transfemoral amputee, which hip motion is most limited by the absence of the distal limb segment?

Accepted Answer

Terminal swing extension

Answer

Hip flexion in stance

Answer

Abduction in swing

Answer

Internal rotation in loading response

Question 3

The obliquity of the metatarsophalangeal break line affects prosthetic foot design primarily by influencing:

Accepted Answer

Roll-over shape and mediolateral stability during push-off

Answer

Heel cushion stiffness at initial contact

Answer

Ankle dorsiflexion range of motion

Answer

Pylon torsional compliance

Question 4

Spasticity in the lower extremity is a velocity-dependent increase in which reflex?

Accepted Answer

Tonic stretch reflex

Answer

Golgi tendon organ reflex

Answer

Flexor withdrawal reflex

Answer

Crossed extensor reflex

Question 5

Which of the following joints is considered the 'key link' in the kinetic chain for transferring force from the foot to the hip?

Accepted Answer

Knee joint

Answer

Ankle joint

Answer

Subtalar joint

Answer

Hip joint

Question 6

Excessive lumbar lordosis in a transfemoral prosthetic user most commonly indicates:

Accepted Answer

Hip flexion contracture not accommodated by socket flexion

Answer

Prosthetic foot set too far anterior

Answer

Excessive pylon length causing vaulting

Answer

Soft residual limb tissue causing pistoning