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How many points are required to be selected to define the
15
articular surface CT landmark?
For the direct anterior approach, the application requires
the capture of the anterior Notch
landmark during pelvic registration.
For the direct superior, posterolateral, and anterolateral
approaches, the application
horn
requires the capture of the anterior landmark
during pelvic registration.
The anterior notch is located superior of the iliac spine on
the anterior wall of the false
acetabulum.
During pelvic registration, if either the anterior or poste-
rior landmarks are inaccessible it is
true
possible to relocate the CT landmark to a more accessible
location nearby.
Mako defines pelvic tilt as the rotation of the pelvis in the
sagittal view, measured as the
true
angle between the anterior pelvic plane and the coronal
plane.
Mako defines sacral slope as the angle between a line
representing the superior end plate
true
of the S1 vertebra and the horizontal plane in the sagittal
view.
pelvic tilt is when the anterior pelvic plane is
rotated anteriorly relative to the anterior
coronal plane, as shown in the image below.
posterior
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pelvic tilt is when the anterior pelvic plane is
rotated posteriorly relative to the
coronal plane, as shown in the image below.
When using the pelvic tilt feature, the application will
provide the user with a
supine
pelvic tilt angle using CT landmarks selected on the pa-
tient's anatomy.
Pelvic tilt and sacral slope values for standing and sitting
x-rays must be acquired outside of
true
the THA 4.0 application to use the pelvic tilt planning
features.
If the change in a patient's pelvic tilt is 20 degrees when
moving from standing to sitting,
20 degrees
what is the change in the same patient's sacral slope when
moving from standing to sitting?
Selection of the sacral slope CT landmark should be done
sagital
in the view.
If the surgeon is struggling with or unable to reach a
patient landmark intraoperatively, you have the true
ability to move that point to a more accessible location.
Hip length is calculated by measuring the distance from
the landmark to the ASIS lesser trocanter
axis.
Only the operative femur is segmented for the Mako Total
false
Hip application.
Combined ottset is calculated from the midline to the
canal axis
.
The midline CT landmark is selected at the center of the
pubic symphysis
.