Ergonomics is matching the job to the worker and the product to the user.
Current legislation such as the Health and Safety at Work Act 1974 and The Equality Act 2010 state that the employer has a responsibility to make the workplace safe for their employees and to implement Reasonable Adjustments. Apart from legal duty, working practices that risk causing injury or prevent recovery in an injured worker affect productivity of an overall workforce.
More than a DSE Assessment is required, when individuals have medical needs to be considered. In this instance an Ergonomic Assessment is required, as this is a longer assessment, with time to review the medical situation, make individual adjustments and more detailed solutions are often required.
It may be that the individuals anthropometric (body dimensions) measurements need to be taken, if they require an alternative chair. See Ergonomic Assessment.