Can somebody please help me understand the anatomy of why my serratus wont hold my shoulder blade down? I have done serratus work non stop for a year now with 3 different therapists. All kinds of pushing pressing and wall slide variations that I thought would solve my shoulder blades and ultimately all of my nerve pain, but nothing worked.

What's happening here? My EMG, Nerve conduction/velocity, Neck MRI and cervical spine XRAY were all normal. So my winged scapula has to just be from weak serratus right? Why won't strengthening that muscle help it to do its job?