gait cycle

Walking feels like one continuous flow, but it is actually a repeating loop, the same sequence of events happening over and over with each leg. Breaking that loop into named stages is what lets clinicians describe, compare, and treat the way someone walks — turning a vague 'they limp' into a precise account of which part of the loop has gone wrong.

The gait cycle is one full sequence for a single leg, defined from when one foot first touches the ground to the next time that same foot touches the ground. It splits into two phases. Stance phase is when the foot is on the ground bearing weight — it begins at heel strike (initial contact), rolls through the foot flat on the ground and the body passing over it, and ends at toe-off as the foot pushes off and leaves the ground; stance is roughly 60 percent of the cycle. Swing phase is when the foot is off the ground, swinging forward to take the next step — about 40 percent of the cycle. For a brief moment in normal walking both feet are on the ground at once (double support), and it is the loss of that safety overlap, at higher speeds, that turns walking into running. The smoothness of walking comes from small, coordinated adjustments of the pelvis, hip, knee, and ankle that keep the body's center of mass from bobbing too much — the so-called determinants of gait.

This shared vocabulary is the backbone of gait rehabilitation. Saying a problem appears 'in late stance' or 'during swing' tells the whole team precisely where in the loop to look and what to train — a foot that drops during swing (catching the toe) is a different problem, with different solutions, from a knee that buckles at heel strike. The honest note is that the textbook cycle describes one smooth, efficient pattern; real walking varies between people and tasks, so the cycle is a reference frame for spotting and naming deviations, not a single 'right way' everyone must match.