What is the treatment for ac joint separation?

It depends: On the grade, 1-obesvation and treatment, 2- also could be treated by the method, 3- most likely need surgery. Ther are classification for those injuries are more detailed.

Let us try: Generally, there is no known cure for knock knees post-childhood.Contrary to common belief, no amount of orthotic treatment or bodybuilding exercise will straighten knock knees for adults. If the condition persists or worsens into late childhood and adulthood, a corrective osteotomy may be recommended to straighten the legs.