English to French Medical Medical: Health Care Total knee replacement: physical activity guide

Hello, thank you for your help!

here is the context:

Short Arc Kicks
1.
You should put something firm underneath the operative knee
like a folded blanket
. See image.
2.
Lie
on your back with the operative knee resting bent like this.
See image.
3.
Keep the thigh over the roll and kick upwards to straighten the
operative knee.
4.
Slowly return the knee to the initial position