See ur doc 4 evaluat
You may have simply strained the ligaments on both sides of the knee that help hold the joint together, or you may have actually torn one/more.
If knee "catches" when u try to straighten or bend it, u may have damaged the internal cartilege (meniscus). If the knee is unstable from front to back, you may have injured a cruciate ligament on the inside of the knee. Evaluation by your doc important.