My sisters doctor told her to pray sitting, I think due to some knee issue. Although my sister walks and sits just fine. Maybe praying completely might cause a little pain. She currently prays while sitting down like how you sit on a chair without prostrating and bowing correctly. Whats the advice?

Ustadh AbdulAziz al-Haqqan

I do not know maybe the doctor sees that this will cause injurry or maybe she is better Allah knows best.