My 11yo son was playing kickball and hearda loud pop in his right hip area one week ago. Pain in crease of right leg in front of hip. First 2 days had difficulty lifting his leg. Better but hurts to run/sprint. He can jog, pitch and jump, but hurts to run. Very active, very athletic. Taekwondo, baseball, basketball. Big baseball tournament this weekend. Whar should I do for him?