Guidance on the amounts of each exercises you should aim to do are provided, but let pain be your guide and only do as much as you can within the amounts given.
Aim to do the exercises three times a day.
Knee extension – lying
Sit on the floor or a bed with your injured leg straight out in front of you

Gently tense your thigh muscle and try to flatten your knee into the supporting surface.

Hold for 10 seconds and repeat 7-10 times
Knee flexion and extension
Lay on the floor or a bed with both legs straight.

Bend your injured leg as far as you can then straighten it back out. Bend your leg as far as you feel comfortable.

Only do this if you feel you could have done it before your injury
Repeat 5-10 times
Knee extension – sitting
Sit on a chair.

Straighten your injured leg as far as you can then bend it back down

Hold for 5 seconds and repeat 10 times