Biomechanical Analysis & Movement Flashcards

Which gait deviation involves the pelvis dropping on the unsupported side during single-leg stance?

Answer: Trendelenburg gait

A Trendelenburg gait results from weak hip abductors (gluteus medius) on the stance leg, causing the contralateral pelvis to drop.

Which concept describes the ability of the neuromuscular system to produce, reduce, and stabilize forces in all three planes of motion?

Answer: Integrated Performance Paradigm

The Integrated Performance Paradigm describes how movement requires force production, force reduction (deceleration), and dynamic stabilization across all planes.

What does 'reciprocal inhibition' mean in the context of muscle function?

Answer: Activation of the agonist causes reflex inhibition of the antagonist

Reciprocal inhibition is the neurological process where activation of the agonist muscle causes the antagonist to relax, allowing smooth movement.

Tibial internal rotation during weight-bearing is coupled with which motion at the subtalar joint?

Answer: Pronation

As the tibia internally rotates during weight acceptance, the subtalar joint pronates due to the coupled triplanar motion at the hindfoot.

Which assessment tool involves observing a client perform a two-legged squat from anterior, lateral, and posterior views?

Answer: Overhead Squat Assessment

The Overhead Squat Assessment (OHSA) is a multi-planar movement screen used to identify compensations in posture and movement patterns.

What is the primary kinetic chain function of the gluteus medius during single-leg stance?

Answer: Lateral pelvic stabilization

The gluteus medius acts as a lateral pelvic stabilizer during single-leg stance, preventing the opposite hip from dropping.

Which movement compensation is typically observed at the knees during the overhead squat assessment when the calves are overactive?

Answer: Feet turn out

Overactive gastrocnemius/soleus restricts ankle dorsiflexion, causing the feet to externally rotate (turn out) to allow deeper squat depth.