EDAN Acclarix AX4 User Manual page 90

Acclarix AX4 Diagnostic Ultrasound System User Manual
7.3.2.5. Hip Joint Angle Measurement
Hip Joint Angle Measurement is intended to evaluate the development of acetabular roof and the
subluxation of femoral head for pediatrics. This measurement is performed by adding three
straight lines on the anatomic image, thereby calculating two angles. See the illustration below.

Line A (Baseline) connects the osseous acetabular convexity to the point where the joint
capsule and the perichondrium unite with the iliac bone;

Line B(Inclination Line) connects the osseous acetabular convexity to the labrum
acetabulare;

Line C(Roof Line) connects the lower edge of the iliac bone to the osseous acetabular
convexity.
α is the angle between baseline and roof line.

β is the angle between baseline and inclination line.

To use Hip Joint Angle measurement:
1. Invoke the B-mode Measure function
2. Select HIP on the touch screen and then select Left or Right on the right side of touch screen.
A single caliper will be displayed on the image field.
3. Add the baseline by method of measuring distance with a caliper pair.
4. Add the roof line in the same manner and the angle of α comes out.
5. Add the inclination line in the same manner and the angle of β comes out.
6. Evaluate the type of hip joint through Graf method.
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