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What have Cochrane’s reviews of ergonomics found?

What probably works:

• Moderate-quality evidence shows ergonomic mouse plus arm support does cut shoulder/neck injuries (but not upper-arm injuries).

What probably does not:

• Low-quality evidence shows ergonomic interventions, including workstation adjustments and training, have no effect on neck pain.
• Moderate-quality evidence shows ergonomic mice do not cut shoulder/limb injuries compared with normal mice.

We do not know if the following work, due to very low quality evidence or lack of trials

• We do not know if ergonomic interventions overall, including special keyboards and desk adjustments, are better than a placebo for treating arm, neck and shoulder complaints due to the very-low-quality evidence.
• We do not know if different monitors and chairs cut shoulder/limb injuries due to the very-low-quality evidence.
• We do not know if ergonomic training reduces neck pain.
• We do not know if ergonomic training plus workstation redesign improves neck and upper‐extremity symptoms due to the very‐low‐quality evidence.

https://www.smh.com.au/lifestyle/health-and-wellness/a-difficult-position-experts-question-whether-ergonomics-holds-up-20180910-p502w5.html