Stand behind a chair.
Reach out and place both hands on the back rest.
To exercise the affected knee, move the other foot backwards slightly and just touch the big toe onto the floor .
Don't use the rear leg in this exercise, it is there to stabilise you.
Keep your gaze horizontal, your back straight, and start the squats with the affected leg.
Bend the knee and then rise back up.
Repeat. If you feel strong enough, lift the rear foot off the floor and carry on with the single leg squatting.
Bend and lower on the affected knee down and then come back up.
Repeat.
Bring your rear leg down and redistribute your weight evenly on both feet.
