The motions, forces, and moments at the major joints of the lower limbs
of ten men ascending and descending stairs were analyzed using an
optoelectronic system, a force-plate, and electromyography. The mean values
for the maximum sagittalplane motions of the hip, knee, and ankle were 42,
88, and 27 degrees, respectively. The mean maximum net flexion-extension
moments were: at the hip, 123.9 newton-meters going up and 112.5
newton-meters going down stairs; at the knee, 57.1 newton-meters going up
and 146.6 newton-meters going down stairs; and at the ankle, 137.2
newton-meters going up and 107.5 newton-meters going down stairs. When
going up and down stairs large moments are present about weight-bearing
joints, but descending movements produce the largest moments. The
magnitudes of these moments are considerably higher than those produced
during level walking.