Dear Rahul, for treating any medical condition, its important to identify the root cause. Knock knees are caused due to Vitamin D deficiency, Obesity, injury to the shin bone and Osteomyelitis. It is caused due to the foetal position in the mother's womb. As the infant grows into puberty, most of the cases are rectified. If the underlying cause is either obesity or Vutamin D deficiency, it is treated accordingly. But if its due to Arthritis or injury to the shin bone, ideally knee braces can be used. Exercises, stretching can also be used. Surgical intervention is ideally used as a last option.