rehab-lab

gait-cycle — chart data

Data behind Essay 07, “Walking is controlled falling.”

Source

Normative teaching values in the Perry / Rancho Los Amigos gait-analysis tradition, as presented in the essay. Joint angles approximate ±5°. Extracted October 2026 from the essay’s embedded key values (no external retrieval; these are teaching values, not one person’s recording).

Files

• joint-angles.csv — the eight key values the curves interpolate between: pct (percent of gait cycle), hip_deg, knee_deg, ankle_deg.
• phases.csv — the eight Perry phases with the per-phase joint values shown in the scroll steps: phase, pct_range, hip, knee, ankle (values as written in the essay, e.g. ~28° flex, ~8° PF).

Sign convention (joint-angles.csv)

Positive = flexion / dorsiflexion (the chart axis reads “FLEXION / DORSIFLEXION POSITIVE”). Negative hip values are extension; negative ankle values are plantarflexion.

Transformations

None beyond extraction: the CSVs hold the raw key values exactly as embedded in the essay. On the page, the joint-angle curves interpolate linearly between the joint-angles.csv rows, and the walking figure, clock, phase label, and joint readouts all read the same values.

Gaps

• The center-of-gravity wave (~5 cm vertical, ~6 cm lateral) is drawn as a decorative schematic path, not plotted from data — no CSV for it.
• The stance 60% / swing 40% split, the ~10% double-support windows, and the ~40% single-support figure are single reference numbers stated in the essay text, not a dataset.
• Cadence (~101–122 steps/min) and step length (~2.5 ft) are broad teaching averages mentioned in the methods note; they are intentionally not used to score the figure.