Six weeks post op for a PTR, I have moved rapidly from two crutches, to one and now to none. Although at times I waddle like a duck, I am able to take my full weight on the operated knee and seem to be walking reasonably well for short distances. While I'm easily walking 2-300 metres at a time and feel the knee getting stronger by the day, I'm not sure whether to keep using one crutch so as to build up my ability to walk distances. Any advice?