American Journal of Roentgenology, Vol 165, 1215-1219, Copyright © 1995 by American Roentgen Ray Society
Traumatic anterior dislocation of the hip: spectrum of plain film and CT findings
RE Erb, JR Steele, EP Nance Jr and JR Edwards
Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, TN 37232-2675, USA.
Traumatic anterior dislocation of the hip represents 11% of all hip
dislocations and is classified into superior and inferior types [1].
Whereas inferior anterior hip dislocation is easily recognized on an
anteroposterior radiograph of the pelvis, the radiographic appearance of
superior anterior hip dislocation is less straightforward, often leading to
an initial misdiagnosis of posterior hip dislocation. Misdiagnosis of the
direction (anterior versus posterior) of a hip dislocation can result in
failed closed reduction or an improper surgical approach to open reduction.
In addition, recognition of associated impaction fractures is important, as
patients with this finding have a greater tendency to develop traumatic
arthritis [2, 3]. This pictorial essay, which is based on our experience
with 20 cases of anterior hip dislocation, including five of the rare
superior type, illustrates the spectrum of radiographic findings and
distinguishing features associated with anterior hip dislocation.
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