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General Calculations
LOGIQ 500 Basic Users Manual
2276612–100 Rev. 0
8–9
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Hip Dysplasia Measurement
A HIP Dysplasia measurement is available. 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 2
angles are computed, displayed and can be used by the
physician in making a diagnosis.
The three lines are (Source: R GRAF, journal of Pediatric
Orthopedics, 4: 735–740(1984)).
1. The inclination line connects the osseous convexity to
labrum acetabulare.
2. The Acetabulum roof line connects the lower edge of
the osilium to the osseous convexity.
3. The Baseline connects the osseous acetabulum
convexity to the point where the joint capsule and the
perichondrium unite with the iliac bone.
The Angle
α
(Alpha) is the supplement of the angle between 1
and 3. It characterizes the osseous convexity. The angle
β
(Beta) is the angle between lines 1 and 2. It characterizes the
bone supplementing additional roofing by the cartilaginous
convexity.
NOTE: There are two methods (Cranial–left and Caudal–left)
for the Hip Dysplasia Measurement Orientation. This preset,
“Hip Orientation”, is located on Preset Program page 4.
T
Figure 3–25. Hip Dysplasia