What Causes Pain In Groin Radiating Towards Knee, Hip And Back?

my boyfriend is having trouble with pain in in groin and travels to his knee, hip and back. Therapy did not work and he is currently waiting for a Doctor to call him back with a place he can go to for an open MRI. That was three days ago Do you have any idea what it could be. He was in very bad pain this morning after he tried to go shopping.