bridges, squats, lunges, inclined walking/jogging. Sorry to say but all excercise that I know of for ham, glute and lower back excercise (posterior chain) involve knee joint movement. Check out the excercises listed and try them and their variations to find the ones that you can do.
lunges are ideal for you as you still get 100% effort but with half the wt...deadlifts and hip dominant movementsd might be good too as the strain goes onto the hips/glutes, not the knees/quads...give them a go and find out
