Three-dimensional computed tomography evaluation of bony birth canal morphologic deformity (small pelvic cavity) after dome pelvic osteotomy for developmental dysplasia of the hip.
OBJECTIVE
Using three-dimensional computed tomography, we investigated the morphologic deformity of the birth canal in patients with developmental dysplasia of the hip who underwent dome pelvic osteotomy.


METHODS
Thirty-five normal subjects, 34 patients with developmental dysplasia of the hip who did not undergo dome pelvic osteotomy, and 21 patients with developmental dysplasia of the hip who underwent dome pelvic osteotomy were recruited for the study. We assessed the underlying pelvic deformities together with the postoperative pelvic morphologic changes (iatrogenic deformity).


RESULTS
Sagittal diameters of the pelvic contraction were longer, and transverse diameters of the pelvic inlet, expansion, and contraction were shorter in patients after dome pelvic osteotomy than in normal control subjects.


CONCLUSIONS
Anthropoid-type pelvis (a long pelvic inlet diameter in the sagittal dimension while the corresponding measurement in the transverse dimension is short) was observed in as many as 90.5% of patients with developmental dysplasia of the hip after dome pelvic osteotomy.
Kojima
Seiichi
S
Department of Orthopaedic Surgery, Shinshu-u University, Nagano, Japan.
Kobayashi
Seneki
S
Saito
Naoto
N
Nawata
Masashi
M
Horiuchi
Hiroshi
H
Takaoka
Kunio
K
D001848:Bone Diseases, Developmental / Q000601:surgery*; D006615:Hip; D006621:Hip Joint / Q000000981:diagnostic imaging; D007592:Joint Diseases / Q000000981:diagnostic imaging / Q000601:surgery*; D015207:Osteoarthritis, Hip / Q000209:etiology; D010027:Osteotomy; D010384:Pelvic Bones / Q000000981:diagnostic imaging* / Q000601:surgery*; D011183:Postoperative Complications; D014057:Tomography, X-Ray Computed / Q000379:methods*