CNA Comprehensive Core Competency Practice Test

Using proper body mechanics is crucial for ensuring safety and preventing injury when lifting patients. Bending at the knees while keeping the back straight is the correct approach because it allows the CNA to utilize the strength of the legs, which are much more powerful than the back muscles. This technique minimizes the risk of strain on the back and utilizes the body's center of gravity effectively.

When bending at the knees, the CNA is able to lower the body closer to the object being lifted, reducing the distance and making the lifting process safer and more manageable. Keeping the back straight helps to maintain proper alignment and support, further protecting the spine during the lift.

Other methods, such as bending at the waist or lifting with the back, can lead to injuries, as they place undue stress on the spine and are not leveraging the body’s strongest muscles effectively. This highlights the importance of using the legs for lifting rather than relying on arm strength or improper postures.