Knee bucking means there is an issue with the parents.
Right knee is called “Satyam”. If one tells lies, there could be knee buckling. Even sometimes we would have told a lie to escape from a situation we don’t like. It may not be so severe but still the body says it is wrong through knee buckling.
If there is a buckling in the right knee then it means that the person is lying.
If there is any problem or buckling in the left knee, it means that the person is doing something unfair. Some Adharamam is happening there. Left knee is called “Adharma”.