Two key terms to understand when discussing body mechanics are dorsiflexion and ulnar deviation. These terms are essential to understanding what is wrong, before addressing what is correct.

Dorsiflexion

Dorsiflexion is flexing of the wrist so that the fingers are higher than the wrist. Many people do this when they type at a keyboard, if they rest their wrists while typing. Dorsiflexion can contribute to musculoskeletal injuries because the flexed position restricts circulation to the median nerve and this is why many people experience wrist pain after typing for long periods. To prevent dorsiflexion, wrists should not be resting while typing. Wrist rests are for resting only, not for typing.

Ulnar Deviation

Ulnar deviation occurs when the wrist is cocked to the same side as the pinkie finger, instead of aligned straight in a neutral position. The tendons in the hand and forearm strain with repetitive deviation. Ulnar deviation can occur in many situations, such as driving, mousing, and typing. It is important to be cognizant of ulnar deviation because many musculoskeletal disorders are the result of prolonged ulnar deviation.

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