Desk Ergonomics & Typing Posture Score
Answer 8 questions about your workstation setup and receive a desk ergonomics score with prioritised changes that will reduce lateral elbow stress during your working day.
Occupational lateral epicondylitis accounts for up to 35% of all cases. Desk workers who type 4+ hours daily on a raised keyboard have 2–3× the ECRB loading compared to ergonomically optimised setups. Fixing your workstation is a parallel intervention to exercise rehab — without it, you re-irritate the tendon for 8 hours every day while trying to heal it for 15 minutes. This tool scores your current setup and tells you what to fix first.
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Workstation Ergonomics Assessment
Answer each question about your current setup. Each question is scored based on evidence from occupational ergonomics and lateral elbow injury research.
This assessment is based on ergonomics guidelines for desk workers with upper limb pain. For severe or occupational injury cases, a formal ergonomic workstation assessment by an occupational health specialist is recommended.
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How Desk Work Causes Lateral Epicondylitis
The Typing Load on ECRB
Every keystroke requires the wrist extensors (primarily ECRB) to stabilise the wrist against the flexion force of finger flexors hitting the keys. EMG studies show ECRB activates at 10–30% of maximum voluntary contraction (MVC) with each keystroke. At 60 keystrokes per minute for 6 hours, this totals 21,600 ECRB activations per working day. While each is low-load, the cumulative daily volume creates the overuse conditions that cause reactive tendinopathy in genetically susceptible individuals.
Wrist Extension Angle and ECRB Load
The ECRB is under greatest tension when the wrist is in extension (bent upward). A keyboard positioned above elbow height forces continuous wrist extension throughout the typing session. Research by Jensen et al. (2002) found that every 10° of wrist extension during typing increases ECRB loading by approximately 15%. A raised laptop keyboard on a flat desk can force 20–30° of wrist extension — tripling ECRB load compared to a neutral wrist position. This is why occupational lateral epicondylitis is disproportionately common in laptop-only users who work at fixed-height desks.
Mouse Distance and Elbow Loading
Mouse placement further from the body requires elbow extension during mouse movements. Extended elbows increase the mechanical disadvantage of the wrist extensors, requiring greater force generation for the same wrist stabilisation task. Studies in occupational health settings find that mouse distance greater than 30 cm from the body significantly increases lateral elbow pain incidence compared to a close, neutral position. A vertical mouse (thumb-up grip) reduces supination-related ECRB stress by approximately 25% compared to a standard horizontal mouse.
Break Frequency and Tendon Recovery
Tendon tissue requires recovery time between loading bouts. Continuous loading without micro-breaks prevents the vascular flushing and metabolite clearance that occur during rest. Research on tendinopathy in office workers (Waersted et al. 2010) shows that workers who take micro-breaks every 20–30 minutes have significantly lower rates of upper limb pain than those who work continuously for 90+ minute periods at the same workload. Stand-up tasks, hand-shaking, and 30-second wrist stretches are sufficient to interrupt the loading pattern.
Ergonomics Risk Factor Reference
| Factor | Optimal | Risk Condition | Correction |
|---|---|---|---|
| Keyboard height | At or below elbow | Above elbow — wrist extension | Adjustable desk or negative-tilt tray |
| Mouse distance | Within 20–25 cm, elbow near body | Arm extended, unsupported | Extended mousepad, elbow on armrest |
| Mouse type | Vertical mouse or trackball | Standard horizontal mouse, fingertip grip | Switch to vertical or trackball mouse |
| Elbow angle | 90–110° | < 90° or > 120° | Adjust chair height or desk height |
| Break frequency | Every 20–30 min | Continuous 90+ min sessions | Pomodoro timer or break reminder app |
Sources: Jensen et al. (2002); Waersted et al. (2010); OSHA ergonomics guidelines for computer workstations; Shiri et al. (2019) occupational risk factors for lateral elbow pain.
FAQ
Can typing at a desk cause tennis elbow?
Yes. Occupational lateral epicondylitis is increasingly common in desk workers who spend extended hours typing. ECRB activates during every keystroke to stabilise the wrist. Over 6–8+ hours of daily typing on a raised keyboard, cumulative ECRB load exceeds repair capacity. A 2019 study by Shiri et al. found desk workers with more than 4 hours of daily computer use had significantly elevated lateral elbow pain risk.
What is the ideal keyboard height for tennis elbow?
The keyboard should be positioned so your elbows are at or slightly above 90°, wrists are neutral (not extended upward or flexed downward), and forearms are parallel to the floor or angled slightly downward. A negative-tilt keyboard tray (angled slightly away from you) minimises wrist extension and ECRB loading during typing.
Does a vertical mouse really help tennis elbow?
Evidence suggests yes for occupational cases. Vertical mice keep the hand in a "handshake" position (thumb up), reducing forearm pronation and the associated ECRB tension. Studies comparing standard vs vertical mice in users with upper limb pain show 15–30% reduced forearm muscle activation with the vertical mouse. Results are most pronounced for workers spending 3+ hours daily on mouse tasks.
Is my data sent anywhere?
No. All assessment data is stored in your browser's localStorage under the key 'teo-ergo-v1'. Nothing is sent to any server. Use the Reset button to clear saved answers.
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