1.   It is common in sports such as basketball and volleyball, in which sudden vertical leaps into the air straighten the knee and cause tiny tears in the tendon.

2.   Lift by first bending from the knees, then hold the object close to your body and stand up by straightening your knees.

3.   While sitting on a chair, straighten your knees to raise your feet.

4.   Push the feet into the floor to straighten the knees.

5.   The chip had dislodged itself, preventing Moceanu from even being able to bend or straighten her knee.