Extensor substitution is primarily observed during which phase of gait?

Extensor substitution is primarily observed during which phase of gait?

• A. Mid stance
• B. Terminal stance
• C. Swing phase
• D. Pre-swing

Answer: (C)

Extensor substitution is most commonly observed during the swing phase of gait. During this phase, the foot and leg need to clear the ground to allow for proper advancement. In instances where there may be weakness in the hip flexors or ankle dorsiflexors, the body compensates for this insufficiency by using the hip extensors and knee extensors to elevate the leg, resulting in an altered gait pattern. In this context, during swing phase, it is crucial for the foot to clear the ground; therefore, if there’s muscular weakness, the patient may rely more heavily on extensor muscles, leading to a characteristic high-stepping gait. This compensatory strategy helps prevent tripping or dragging of the toes, which can occur due to a lack of proper dorsiflexion and hip flexion. The other phases of gait, such as mid stance, terminal stance, and pre-swing, don't typically involve extensor substitution to the same extent. Instead, these phases are more focused on stability and propulsion rather than the need to clear the leg from the ground, which is the primary concern during the swing phase.

Extensor substitution is most commonly observed during the swing phase of gait. During this phase, the foot and leg need to clear the ground to allow for proper advancement. In instances where there may be weakness in the hip flexors or ankle dorsiflexors, the body compensates for this insufficiency by using the hip extensors and knee extensors to elevate the leg, resulting in an altered gait pattern.

In this context, during swing phase, it is crucial for the foot to clear the ground; therefore, if there’s muscular weakness, the patient may rely more heavily on extensor muscles, leading to a characteristic high-stepping gait. This compensatory strategy helps prevent tripping or dragging of the toes, which can occur due to a lack of proper dorsiflexion and hip flexion.

The other phases of gait, such as mid stance, terminal stance, and pre-swing, don't typically involve extensor substitution to the same extent. Instead, these phases are more focused on stability and propulsion rather than the need to clear the leg from the ground, which is the primary concern during the swing phase.