 [ Symptoms ] how can epilepsy be prevented [ Disease ] i am not sure if you really mean the knee itself is dislocating or if it is the kneecap big difference obviously it is not normal for anyone is knee to dislocate    certainly not three times in a single year possible explanations for this would include trauma or orthopedic abnormalities your best bet is to consult a pediatric orthopedic specialist he or she can examine the child perform some imaging studies like x ray or mri and suggest ways to treat the problem repeatedly dislocating a joint can cause many other issues later in life including arthritis and ligament problems you should not allow this situation to continue without getting a medical expert involved wishing you well