HMS, BM EQ-Bank 847 MC

When lifting a heavy box from the floor, which application of biomechanical principles would MOST effectively reduce the risk of lower back injury?

Keeping the knees straight and bending at the waist
Holding the box far from the body to distribute weight evenly
Positioning the feet close together for better balance
Keeping the weight close to the body and bending at the knees

Show Answers Only

\(D\)

Show Worked Solution

D is correct: Close weight reduces lever arm on spine while bent knees engage stronger leg muscles.

Other Options:

A is incorrect: Straight knees and bent waist places dangerous stress on lower back.
B is incorrect: Far weight position increases lever arm and spinal torque significantly.
C is incorrect: Close feet reduce stability and increase risk of falling while lifting.