Your diagnosis? Ischial avulsion fracture.
Desai
Madhura A
MA
Department of Radiology, Mayo Clinic, Jacksonville, Florida, USA.
Bancroft
Laura W
LW
D000293:Adolescent; D005260:Female; D050723:Fractures, Bone / Q000000981:diagnostic imaging*; D006801:Humans; D007512:Ischium / Q000000981:diagnostic imaging* / Q000293:injuries*; D011859:Radiography