I had bursitis of knee a little while ago. I was out and normally in trainers but had new wedge shoe's, going upstair my foot twisted are nowsorewhy?

See below. You are sore due to the twisting that you describe. You may have created a sprain or strain of the ligaments.
See details. What is sore, your knee or your foot?. You need to provide more specifics. If ice and rest do no help after a few days, have the area examined.