A male lacrosse player reports to your clinic for evaluation of a knee injury following practice.

A male lacrosse player reports to your clinic for evaluation of a knee injury following practice. He states that he injured his knee yesterday, but decided to try and “tough it out” and kept practicing. However, the pain is increasing and it is now affecting his function. His mechanism of injury was a twisting during a shot, and he felt a pop and sharp pain in the “inside” and medial aspect of his knee. He complains of tightness, stiffness, pain, locking, and a “loose” feeling. What possible injuries do you need to look for? What injuries do these symptoms occur with?