Determine the Muscle Force Needed to Maintain an Upright Position

Multiple Choice

Determine the muscle force needed to maintain an upright position for the following subject during single limb stance. Body weight = 240 lbs.
Line of gravity (LoG) to rotation point on femur = 4 in.
Femoral head to abductor muscle attachment = 2.5 in.

A) 384 lbs.
B) 320 lbs.
C) 256 lbs.
D) 150 lbs.