What is the maximum degree of knee flexion expected during the swing phase of gait?

The maximum degree of knee flexion during the swing phase of gait is typically around 60 to 90 degrees, depending on individual variability and specific scenarios such as walking speed and the surface being traversed. While this flexibility in the knee is necessary for appropriate limb clearance during the swing phase, it is generally accepted that the average maximum knee flexion that is observed is about 70 degrees.

This degree of flexion allows the leg to move forward without dragging on the ground, ensuring a smooth and efficient gait. Effective knee flexion during the swing phase is critical for both functional mobility and the prevention of fall risk, as it aids in the overall coordination and rhythm of walking.

In contrast, the other choices may represent less commonly observed flexion and could limit efficient walking mechanics. Having too little knee flexion (such as what's suggested by the lower options) might result in difficulties in limb clearance, which can lead to tripping or falling. Thus, the correct understanding of knee flexion in this context emphasizes the need for sufficient mobility during the swing phase, corroborating why 70 degrees is a plausible and expected measurement in typical gait analysis.