I think Linda2 is right. When I was working on stair therapy, I would go up and down 5 steps (not the whole stairway) once or twice a day to start. Then gradually worked up to bend the knee more and more. The stairs were more for bend than for leg strength. If you want to work on your quad, the bicycle is best for that. Why don't you have someone bring it upstairs for you. You're in recovery....it's okay to have it right in the middle of your living space if you need it. Mine went in the middle of the den near the window so I could pedal it day or night when needed. The bike will help your quad muscles develop. Talk with your therapist also about some exercises for balance. When the leg muscles atrophy, balance goes also.