Department of Orthopaedics, Portsmouth Naval Hospital, Virginia.
Title
Evaluation of CT scans and 3-D reformatted images for
quantitative assessment of the hip.
Source
J Pediatr Orthop 1994 Jan;14(1):48-53
Abstract
Hip measurements using three-dimensional (3-D) images and computed
tomography (CT) scans were evaluated. The 3-D measurements proved more
accurate than CT measurements of femoral and acetabular anteversion.
Additionally, accurate 3-D measurements (> 99%) of the femoral neck-shaft
angle were provided. Acetabular anteversion determinations by CT scans were
systematically decreased as pelvic flexion increased, whereas accuracy was > 96%
with 3-D images. The 3-D software allows image rotation in all three reference
planes, which minimizes positional errors. A case study is provided to exemplify
the shortcomings of conventional imaging techniques and the utility of the
quantitative 3-D protocol.