Part A: Risk Factors
Whether standing or sitting, there is a neutral position for the back, neck, arms and hands. This is the position that puts the least amount of strain on a given part of the body. Postures that differ from the neutral position increase stress on the body. The illustrations below show positions that are good and bad for different parts of the body.
The wrists should be straight while keying. Operating the computer with the wrists bent backwards (extension) or forward (flexion) should be avoided. See Figure 1.
The computer operator should be able to reach the keyboard or mouse while keeping the shoulders and upper arms relaxed and bending the elbows at a 90 degree angle. See Figure 2.
The operator’s back and neck should be straight while at the computer. The top of the monitor should be slightly below eye level. The worker should not have to tilt their head backward or turn to the side to see the screen. See Figure 3.
Other awkward positions should be avoided while working at a computer, such as cradling a phone between the ear and shoulder.