Tapping A Kneecap

• 1). Sit upright on a flat surface. Allow enough room so that both feet can hang freely.
  
  
• 2
  Tapping a knee tests its reflexes.Jupiterimages/Goodshoot/Getty Images
  
  Have another person gently tap the area where the bottom of your kneecap meets your shin. Wait to see if the knee gently rocks back and forth in response to the tap.
  
  
• 3). Repeat the action for the other knee.