Up to 1924, Carp1 collected twenty-one cases (including his own) of fracture of the anterior superior spine of the ilium. Two other cases have been found, which were not referred to in Carp's article. In 1867, Bousseau2 reported a case in which both the anterior superior and anterior inferior spines of the ilium were fractured at the age of 15 years. Since this injury was caused by the passage of a wagon, it is scarcely eligible to this series. In 1914, von Saar3 reported a case in a person, aged 18 years, who was hurt while skiing. Since the publication of Carp's paper, twenty-two additional cases have appeared in the literature.4 My case, accordingly, makes the forty-fifth to be reported.
The etiology of muscular avulsion of the anterior superior spine is of interest. Carp found the average age of his patients to be 17½ years. In