Computer Ergonomics: What OTs Need to Know

Computer Ergonomics: The Essential Guide for OTs 

For many of your clients, the modern workplace is a stationary one. Whether they're returning to work after an injury or simply trying to survive the 9-to-5 grind without discomfort, the computer workstation is often the culprit behind their pain. As an occupational therapy professional, you're uniquely positioned to intervene. You understand anatomy, functional movement, and the importance of occupation in daily life.

Computer ergonomics is more than just recommending an expensive chair or a standing desk. It's the science of designing the job to fit the worker, rather than forcing the worker to fit the job. When you apply ergonomic principles correctly, you can help prevent injury, reduce workers' compensation claims, and improve your client's overall occupational performance.

This guide explores the foundational concepts of computer ergonomics that every therapy professional needs to know. You’ll learn how to identify common risks, recognize the signs of poor posture, and make customized recommendations that actually stick. By mastering these tools, you can empower your clients to work safely and comfortably.

Related CE course for OT professionals: Computer Ergonomics for the Therapy Professional

Understanding the goal: Neutral posture

The cornerstone of computer ergonomics is achieving "neutral posture." This is the body's most relaxed state, where muscles and tendons are at their resting length, and joints are aligned to minimize stress. When assessing a client, your primary goal is to adjust their environment to support this alignment.

A neutral posture at a computer workstation generally looks like this:

• Feet: Placed flat on the floor or supported by a footrest.
• Knees: Bent at an angle between 90 and 110 degrees, with the thighs roughly parallel to the floor. There should be about two inches of space between the back of the knees and the chair.
• Back: Fully in contact with the backrest, supported in a perpendicular to slightly reclined position (90 to 110 degrees). The lumbar curve should be supported.
• Arms: Upper arms close to the body, not reaching forward. Elbows should be bent between 90 and 110 degrees.
• Wrists: Aligned with the forearm, not bent up, down, or to the side. The forearm, wrist, and fingers should be parallel to the floor.
• Neck and head: Upright and facing forward, not twisted or bent.

When a client deviates from this posture, they introduce stress to the musculoskeletal system. Your job is to identify where that deviation occurs and why.

Identifying ergonomic risks: The C.E.R.P. Acronym

When you walk into an onsite assessment—or view a client’s workstation via telehealth—it can be hard to know where to look first. To simplify the assessment process, remember the acronym C.E.R.P. These four categories cover the most common risk factors associated with computer use.

Contact stress

Contact stress occurs when hard or sharp surfaces press into the soft tissues of the body. This inhibits blood flow and can impinge on nerves. Common culprits include the sharp edge of a desk digging into the wrists or forearms, or the front edge of a chair seat pressing into the back of the legs.

Eyestrain

Visual fatigue is a massive complaint among computer users. Studies suggest that over 80% of users experience eyestrain. Look for monitors that are placed too close or too far away (they should generally be an arm’s length away). Check for glare from overhead lights or windows, and ensure the screen brightness matches the ambient light in the room.

Repetitive movement

Repeating the same motion every few seconds for two consecutive hours is a major risk factor. In an office setting, this often manifests as repetitive mouse clicking or typing without breaks. Over time, this can lead to tendonitis and other musculoskeletal disorders.

Posture

This refers to postures that are either awkward or static. Awkward postures involve bending or twisting the neck, back, or wrists. Static postures involve holding a single position—even a "good" one—for too long. Sitting for more than six hours a day is a significant risk factor, as the lack of movement decreases blood flow and increases muscle fatigue.

Environmental and product recommendations

Once you identify the risks, you can move to solutions. It's crucial to remember that one size does not fit all. Buying the same expensive chair for every employee in an office is rarely the right answer because every body is different. Recommendations must be customized to the individual's physical characteristics and work habits.

The chair

The chair is the most critical piece of equipment. It needs to be adjustable to fit the user. Look for chairs that allow for height adjustment, seat depth adjustment, and lumbar support. If the current chair lacks lumbar support, adding a memory foam or mesh back support can be a cost-effective fix.

The input devices

Keyboards and mice are frequent sources of wrist pain. If a client is reaching up to type, their shoulders will hike up, causing tension. A keyboard tray can lower the input devices to lap level, allowing the shoulders to relax. For clients with wrist pain, a vertical mouse can keep the forearm in a neutral "handshake" position, while a roller mouse allows for ambidextrous use to distribute the load.

The monitor

To prevent neck strain, the top of the monitor should be at or slightly below eye level. If it is too low, the user will hunch forward. Monitor risers or adjustable monitor arms are excellent tools to correct this. For laptop users, a laptop stand is essential to raise the screen, but it must be paired with an external keyboard and mouse to prevent awkward arm postures.

Lighting and glare

Environmental factors matter too. If a window is causing glare, recommend closing blinds or repositioning the desk perpendicular to the window. If overhead lights are too harsh, light diffusers or simply removing a bulb can help reduce eyestrain.

Behavioral changes and stretching

Even the most expensive ergonomic furniture cannot fix a problem if the user never moves. As an OT, you can help clients build better habits. Encouraging "micro-breaks" and stretching is vital for preventing injury.

The 20-20-20 Rule

To combat eyestrain, teach clients the 20-20-20 rule. Every 20 minutes, take a 20-second break and look at something 20 feet away. This relaxes the eye muscles and resets the blink rate.

Stretching at the desk

Simple stretches can alleviate muscle tension. However, always instruct clients to stop if they feel pain.

• Neck rotations: Slowly turn the head to the right and left.
• The bird: Place hands in front of the forehead, palms facing out. Inhale and pull elbows/hands back, opening the chest. Exhale and look up.
• Wrist stretches: Gently extend and flex the wrist with the elbow straight.
• Hamstring stretch: Place a heel on the ground, leg straight, and gently lean forward from the hips.

Alternating positions

Static posture is the enemy. Encourage clients to alternate between sitting and standing if they have a sit-stand desk (standing for no more than 20 minutes continuously per hour). If they don't have a standing desk, suggest standing up to take phone calls or walking to a colleague's desk instead of emailing.

Empowering your clients

Ergonomics is a powerful tool in the occupational therapist's toolkit. By identifying the root causes of discomfort—whether they are environmental, product-related, or behavioral—you can provide holistic solutions. Remember to assess the individual, not just the furniture. A customized approach that combines proper equipment with healthy movement habits will keep your clients productive, comfortable, and injury-free.