CaCO3Girl posted:Bulldog 19 posted:Your son's knee valgus movement (knees collapsing in) is caused by a weakness of the hip abductor muscles (of which there are quite a few). Most notably the two muscles you want to focus on are the glute medius and the glute maximus. Both of these muscles play a huge role in knee pain and biomechanics in adolescent athletes.
While I believe you, and will look into those areas, I have a naive question. I am interpreting this to mean my son has weak butt muscles, is that right? What I don't get is how a catcher who sits in the squat position a LOT can have weak butt muscles. Common sense would say that the catcher has the best butt muscles on the team...why the disconnect from common sense?
He's 13 and grew a lot recently.