Final answer:
The nurse should use leg muscles to avoid back injury when transferring a patient from a bed to a chair. Proper lifting technique involves keeping the back erect and utilizing the leg muscles to raise the body.
Step-by-step explanation:
When transferring a patient from a bed to a chair, the nurse should use leg muscles to avoid back injury. Lifting objects with the back can cause muscle strain and damage discs and vertebrae, as the back muscles and spine are subjected to abnormally large forces. Proper lifting technique involves keeping the back erect and utilizing the leg muscles to raise the body. This reduces stress on the back and helps prevent injuries.