title: Atraumatic Anterior Dislocation of the Hip Joint.
abstract: Dislocation of the hip joint in adults is usually caused by high-energy trauma such as road traffic accidents or falls from heights. Posterior dislocation is observed in most cases. However, atraumatic anterior dislocation of the hip joint is extremely rare. We present a case of atraumatic anterior dislocation of the hip joint that was induced by an activity of daily living. The possible causes of this dislocation were anterior capsule insufficiency due to developmental dysplasia of the hip, posterior pelvic tilt following thoracolumbar kyphosis due to vertebral fracture, and acetabular anterior coverage changes by postural factor. Acetabular anterior coverage changes in the sagittal plane were measured using a tomosynthesis imaging system. This system was useful for elucidation of the dislocation mechanism in the present case.
authors.affiliation: Department of Orthopedic Surgery, Tokyo Women's Medical University, 8-1 Kawada-Cho, Shinjuku Ward, Tokyo 162-8666, Japan.
authors.forename: Tadahiko
authors.initials: T
authors.lastname: Ohtsuru
authors.affiliation: Department of Radiology, Tokyo Women's Medical University, Tokyo 162-8666, Japan.
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Morita
authors.affiliation: Department of Orthopedic Surgery, Tokyo Women's Medical University, 8-1 Kawada-Cho, Shinjuku Ward, Tokyo 162-8666, Japan.
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Murata
authors.affiliation: Department of Orthopedic Surgery, Tokyo Women's Medical University, 8-1 Kawada-Cho, Shinjuku Ward, Tokyo 162-8666, Japan.
authors.forename: Junya
authors.initials: J
authors.lastname: Itou
authors.affiliation: Department of Orthopedic Surgery, Tokyo Women's Medical University, 8-1 Kawada-Cho, Shinjuku Ward, Tokyo 162-8666, Japan.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Morita
authors.affiliation: Department of Orthopedic Surgery, Tokyo Women's Medical University, 8-1 Kawada-Cho, Shinjuku Ward, Tokyo 162-8666, Japan.
authors.forename: Yutaro
authors.initials: Y
authors.lastname: Munakata
authors.affiliation: Department of Orthopedic Surgery, Tokyo Women's Medical University, 8-1 Kawada-Cho, Shinjuku Ward, Tokyo 162-8666, Japan.
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Kato
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