An avulsion fracture occurs when a small chunk of bone attached to a tendon or ligament gets pulled away from the main part of the bone. The hip, elbow and ankle are the most common locations for avulsion fractures in the young athlete. You may need to spend a few weeks on crutches if you have an avulsion fracture around your hip.
https://www.mayoclinic.org/avulsion-fracture/expert-answers/faq-20058520