🦴 Femur Under Load: Hip Joint Force, Abductor Moment, Cane and Neck Bending Safety Factor

Balance the pelvis on one leg and see why the hip carries about 2.6 times body weight: moment equilibrium with the abductor muscles, the effect of a cane or trunk lean, and the stress, safety factor and head deflection of a hollow-section femur, with bone loss and stumble loads. Four independent numerical checks.