Gait Mechanics and Dynamics

The video tutorial covers ambulation and its aids, focusing on the mechanics of gait. It explains the gait cycle, including step and stride length, cadence, and the phases of gait. Key terminology is introduced, and the role of the center of gravity (COG) in gait dynamics is discussed. The tutorial also explores the determinants of gait, such as pelvic rotation and knee flexion, and how these factors contribute to gait efficiency. Visual aids and figures are used to enhance understanding.

What is the primary purpose of gait?

• To maintain balance

• To reduce energy expenditure

• To increase speed

• To move the center of gravity forward

How is step length defined in the context of gait?

• The time taken to complete one gait cycle

• The number of steps taken per minute

• The distance between the heel strike of one limb and the heel strike of the opposite limb

• The distance between two consecutive heel strikes of the same limb

What happens to the time of double support as cadence increases?

• It increases

• It decreases

• It remains the same

• It becomes unpredictable

During which phase of the gait cycle does the heel strike occur?

• Double support phase

• Stance phase

• Swing phase

• Mid-swing phase

What is the role of the center of gravity during gait?

• To oscillate randomly

• To remain stationary

• To move in a straight line

• To follow a sinusoidal path

What is the total vertical displacement of the center of gravity during gait?

• Approximately 3 inches

• Approximately 1 inch

• Approximately 2 inches

• Approximately 4 inches

Which determinant of gait involves a rotation of approximately four degrees to each side?

• Knee flexion

• Pelvic tilt

• Pelvic rotation

• Lateral pelvic motion

How does knee flexion contribute to gait efficiency?

• By reducing the need for pelvic rotation

• By stabilizing the center of gravity

• By decreasing the severity of deflections between wave arcs

• By increasing the amplitude of the sinusoidal wave

What is the effect of lateral pelvic motion on the center of gravity?

• It causes the center of gravity to move vertically

• It stabilizes the center of gravity

• It has no effect on the center of gravity

• It produces lateral movement of the center of gravity

Which joint is involved in dorsiflexion and plantar flexion during gait?

• Knee joint

• Hip joint

• Talocrural joint

• Shoulder joint