Another common cause is rickets which results from bone weakness from calcium metabolism disorder.
Other less common causes include bone growth disorders and injury and infections to growth areas of the bone.
The treatment is directed to cause physiological requires no real treatment but monitoring as it will resolve. The other causes have their own treatment criteria.
In summary knock knees can be caused by normal variants to bone abnormalities. It is advisable to see a doctor who can recognise the specific cause and treat appropriately.

Other less common causes include bone growth disorders and injury and infections to growth areas of the bone. The treatment is directed to cause; physiological k leg deformity requires no real treatment, but monitoring, as it will resolve. The other causes have their own treatment criteria. In summary, knock knees can be a normal variant or from bone abnormalities. It is advisable to see a doctor who can recognise the specific cause and treat appropriately.