Q: We have an employee who is becoming unable to fulfil the requirements of his role due to a pre-existing (non-work-related) knee injury. He has worked for us for many years and we have so far accommodated him by allowing him to:

• change tasks when he needs to rest his knee; and
• take unpaid time off work for medical appointments or to rest his knee.

It is becoming problematic as the frequency of his time off and changing tasks is increasing, and it is affecting his ability to do his job and the rest of the team.

How far do we have to go in accommodating this injury before the situation can be deemed as untenable?