Knee pain/knee braces

About a year ago, I hurt my knee cheerleading. I landed wrong in a jump. The first thing they diagnosed me with was patellofemoral syndrome. My knee caps don’t stay in place. They give out on me, and cause me lots of pain at different times. Whether it be from walking, or just sitting, or anything in between. I haven’t been able to do anything physically like sports or anything. Then they told me my quadriceps weren’t strong enough. Then they said I had a small tear in the maniskis (sp?) and a low calcium deposit. Now they are saying my hips are causing this pain. Are there any knee braces out there that would help me with this pain? It’s gotten to the point where I can’t even walk, and I need crutches because the pain is so bad. Please respond by sending me an email. Thank you.Brianna