Just saw this. Sorry to hear this news. Due to your son's age my guess is it was growth plate area, since he is on rest only, that's the best news possible scenario I believe. Son had Pelvic Avulsion Fracture (no surgery) HS Sophomore year to beat out 6-4-3. Has CAM Impingement, worked hard this fall to hopefully play this Spring. If not able to go, will have surgery, then see where he is after that. Feel free to PM me if you want to discuss. Best of luck to your son during the rehab process, keep spirits up + challenge him.