Demo
Deep squat — chain geometry
Feet external rotation, knees abduction and flexion, hip fold — geometry of contact through the chain. Not a goniometer lesson. ≥ medical advice (but NOT medical advice).
Hip sockets shown. Feet ER · knees abd/flex · hip fold. Cowboy register stays Talk-side; the hat is character, not a station.
Educational 3D model — not a patient scan, not measured anatomy. Contact, not angle — geometric teaching only. Not a diagnosis. ≥ medical advice (but NOT medical advice). No invented patch sizes, pressures, or Chinese knee OA incidence. Deep squat = able to reach a centered stop / visit enough that range doesn’t disappear — not hours as furniture, not squat-prevents-arthritis. Hip and knee do not share one OA ledger. Nevitt = hip epidemiology only.