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?
I think you got some good responses to this question above. I would guess it's a combination of factors. You may have strong muscles, but if your body doesn't use those muscles, then what good does strength do? And yes, if your hip flexor muscles are overactive (or "tight") then your glutes aren't going to activate appropriately. Let me give you an analogy here... when you flex your biceps, your elbow bends and the and comes to your shoulder. Your triceps muscles relax. When your triceps muscles are contracted, your biceps relaxes and your arm straightens. Your triceps and biceps muscles are considered antagonist muscles.. they work against each other. The same can be said for your hip flexors and your glutes....