Determine the Muscle Force Needed to Maintain an Upright Position

question 14

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.

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Definitions:

Girdle

Belt or zone; the bony region where the limbs attach to the body.

Range of Movements

The entire spectrum of motion that a joint can achieve, typically involving its capacity for bending and straightening.

True Ribs

The upper seven pairs of ribs that are directly attached to the sternum by their costal cartilages, providing protection to the thoracic cavity.

Sternum

A long flat bone located in the center of the chest, which connects to the ribs via cartilage and protects vital organs like the heart and lungs.