-Is to strengthen the VMO muscle
-Sit upright or lie down with your knee slightly bent over a rolled-up towel, foam roller or other cylinder-shaped object.
-Flex your foot back and concentrate on contracting your shin and quadriceps muscles to straighten your knee. Then, return to your starting position
-Do not do the exercises unless advised by your doctor.
-Repetitions of each exercise depend on your tolerance and condition, usually between 30-50 times.
-If you feel any pain while doing the exercises stop and ask your doctor.