Final answer:
Sonographers should avoid abducting the arm more than 90 degrees to prevent work-related musculoskeletal disorders during scanning procedures.
Step-by-step explanation:
Sonographers should be aware of work-related musculoskeletal disorders, including the strain that can be caused by repetitive movements during scanning procedures. One important best practice to prevent such disorders is to avoid abducting the arm more than 90 degrees during scanning. Abduction refers to the movement of the arm away from the body's midline. By limiting the degree of abduction, sonographers can reduce the strain on their muscles and joints.