Until recently, intrapelvic protrusion of the acetabulum had not been reported in American literature. Though first described by Otto1 in 1824, the first report in this country did not appear until 1922, when Herlzler2 reported one case. Since that time cases have been recorded by Lewin,3 one case; Doub,4 eight cases; Pomeranz5 seven cases; Nichols and Shiflett,6 two cases, and Schaap,7 two cases. In all, approximately sixty-five cases of true Otto pelvis have been reported, and the majority of these in the foreign literature.
Because of its rarity, another case is here reported, with a brief review of the disease.
Intrapelvic protrusion of the acetabulum is a condition characterized clinically8 by pain and limitation of motion in the hip. This restriction of motion is particularly noted in abduction and rotation, and often in adduction, flexion and hyperextension. Muscular atrophy of the thighs is not