Sensible job design, proper workplace layout and good work practices minimize the risk of developing repetitive strain injuries. In this section I review the risk factors that are thought to lead to RSIs as they pertain to persons with disabilities who use computer-based compensatory devices. According to one theory, the movements cause microscopic tears in muscles, tendons and ligaments. The tearing leads to inflammation, and the debris left by inflammation forms scar tissue that binds muscles and stiffens tendons. The injured tissue contracts, decreasing its range of motion.
Tendons normally glide smoothly inside lubricated sheaths.
If the tendons are damaged, the lubricating fluid dries out, causing tendon and sheath to adhere and chafe. If the bones are out of alignment, the muscles must strain to hold the body in position. Good posture is dynamic, not static. The human body must move to remain healthy. Static loading holding parts of the body immobile for long periods tires the muscles.