Tuesday, April 15, 2008

Neutral Position - Fingers, Wrist & Forearm

Finding the neutral positions ...

"In ergonomics, you will frequently hear the term “neutral positioning”. Let’s clarify what this term means. This is part 1 of a 2 part series discussing the fingers, wrist and forearm. Part 2 will discuss the elbows, shoulder and neck.

Definition

According to the medical dictionary at thefreedictionary.com, the neutral position of the arm is a body position to be assumed that prevents cumulative trauma to the arm. It incorporates proper placement of the wrist, elbow, and shoulder.

The Importance of Neutral Positioning

Awkward positioning at your computer can increase pressure or stretch on the nerves or cause friction and strain as the tendons move through or around pulley systems. This can lead to chronic inflammation and pain. Being positioned in the more relaxed and neutral position can help ease strain on the body and improve your work comfort.

The Fingers

The fingers should be relaxed and slightly curved as if they are resting over a large ball. Many people tend to hold their fingers too straight. Holding the fingers rigidly stiff is actually quite stressful to the small muscles in the hand. Two common causes of awkward finger positioning include 1) finger nails that are too long causing the finger to straighten when activating the keyboard with the pad of the fingers and 2) tension or stress causing the computer operator to pound the keyboard.

For more information, see Typing Style - Repetitive Strain Injuries are NOT Just About the Keyboard.

The Wrist

Poor wrist positioning is often implicated in carpal tunnel syndrome and wrist tendinitis. Maintaining a neutral wrist position can be critical to comfortable typing. The neutral wrist position is with the wrist flat (not bent forward or back) and not angled side-to-side. For every fifteen degrees that the wrist is bent forward or back, increased pressure is placed on the nerve that runs through the carpal tunnel.

Common causes of wrist pain include 1) planting the wrist down on the desk or wrist rest in front of the keyboard and 2) a keyboard that is too small causing the wrist to angle toward the small finger when placing the fingers on the home keys.

For more information, see The Wrist & Repetitive Strain Injuries"    (Continued via Bella Online, Marji Hajic)    [Ergonomics Resources]

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