Patella Knee Brace I Need A Knee Brace With An Open Patella?

I need a knee brace with an open patella? - patella knee brace

I was on the track and my knees bother me, so I went to coach and told me that I have mobile joints, and that the knee should open with a ball with something that takes my knees take "situation. It's like a Each of the knee was only there a little push something.

I do not know what would be called and if someone can help me or call me at least a link to a reliable place to get help, help me much.

Thank you!