McCallum suffered a complete hyperextension of his left knee, almost to a right angle. He suffered a ruptured artery in his left knee, and tore three ligaments, tore the calf and hamstring from the bone, and suffered nerve damage in the knee. He initially thought he'd only face a lengthy rehab, but McCallum's surgeon told him that there was no chance of him ever being medically cleared to play again. The surgeon said that he normally didn't see leg injuries this severe except in car accidents. Had the subsequent surgery not gone as planned, there was a chance his left leg would have been amputated.[11]