Measurement and Analysis
Vivid S5/Vivid S6 User Manual 315
R2424458-100 Rev. 2
Hip Dysplasia Calculation
The HIP calculation assists in assessing the development of
the infant hip. In this calculation, three straight lines are
superimposed on the image and aligned with the anatomical
features. The two angles are computed, displayed, and can be
used by the physician in making a diagnosis.
The three lines are:
1. The baseline connects the osseous acetabulum convexity
to the point where the joint capsule and the perichondrium
unite with the iliac bone.
2. The inclination line connects the osseous convexity to
labrum acetabulare.
3. The Acetabulum roof line connects the lower edge of the
osilium to the osseous convexity.
The α (Alpha) angle is the supplement of the angle between 1
and 3. It characterizes the osseous convexity. The ß (Beta)
angle is the angle between lines 1 and 2. It characterizes the
bone supplementing additional roofing by the cartilaginous
convexity.
Making Hip Dysplasia Measurement
To make a Hip Dysplasia measurement:
1. From the Top/Sub Menu, select either the right or left side
(orientation) and then select HIP. A horizontal dotted line
displays.
2. To place the baseline, move the Trackball. Position the
crosshairs edge at the osseous convexity of the ilium.
3. To rotate or change inclination, adjust the Ellipse control or
Hip Rotate.
4. To fix the baseline, press
SET. The system displays a
second dotted line at an angle.
5. To place the line along the inclination line of the osseous
convexity to labrum acetabulare, move the Trackball.
6. To rotate or change inclination, adjust the Ellipse control or
Hip Rotate.
7. To fix the second measurement line, press
SET. The system
displays a third dotted line at an angle.
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