Download Gonstead Pelvic Analysis

Gonstead
Pelvic
Analysis
• Click to label each
segment
• Would like have
prompts (ex. “click on
L1, click on L2”)
L1
L2
L3
L4
L5
Gonstead
Pelvic
Analysis
• Click highest point
on right femur
head (have
computer place dot
there)
• Click on the
highest point of the
left femur head
(place dot)
• Draw line
connecting dots –
“femoral head line”
L1
L2
L3
L4
L5
.
.
Gonstead
Pelvic
Analysis
•
•
•
•
•
Click the highest point on
right iliac crest (have
computer place dot there)
Click the lowest point on
right ischial tuberosity (have
computer place dot there)
Click the highest point on left
iliac crest (have computer
place dot there)
Click the lowest point on left
ischial tuberosity (have
computer place dot there)
Would like to be able to click
and drag the dots to adjust
their position and/or select
the dot and use the arrow
keys to “nudge” it into the
desired position
L1
L2
L3
L4
.
.
L5
.
.
.
.
Gonstead
Pelvic
Analysis
L1
L2
L3
• All lines “flying in”
are constructed
parallel to the
femoral head line.
L4
.
.
L5
.
.
.
.
Gonstead
Pelvic
Analysis
•
•
•
•
•
Need to measure distance
between the iliac crest line
and ischial tuberosity line 90
degrees/ perpendicular to
the femoral head line, not
from point to point, and not
true vertical.
Complete for left and right
side
Measurements ( must be
mm) need to be displayed
on screen (if possible just
caudal to the femur head
dots)
Do not need to display these
vertical measurement lines
(having the computer
automatically compute the
measurement would be a
plus)
L1
L2
L3
L4
.
.
L5
.
.
168
163
.
.
Gonstead
Pelvic
Analysis
• Place dot on S2
tubercle (or S1if
preferred/
visualized).
• Place a dot in
the center of the
pubic
symphysis.
L1
L2
L3
L4
.
.
L5
.
.
.
168
163
.
.
.
Gonstead
Pelvic
Analysis
•
•
•
L1
L2
L3
Draw line perpendicular
to the FHL through the
S1 tubercle to be
displayed adjacent to the
symphysis pubis
Measure between pubic
symphysis dot and
resultant line (mm);
display just caudal to the
pubic symphysis dot.
(having the computer
automatically compute
the measurement would
be a plus)
L4
.
.
L5
.
.
.
168
163
.
.
2
.
Gonstead
Pelvic
Analysis
L1
L2
L3
• Place a dot at the
lateral aspect of
each S1 facet
base
• Draw a connecting
line, the sacral
base line
L4
.
.
.
L5
.
.
.
.
168
163
.
.
2
.
Gonstead
Pelvic
Analysis
•
•
•
•
Place a dot on the most
lateral aspect of the right
and left sacral wing
Lines perpendicular to
the femur head line
should be drawn
extending from these
dots, as well as the S2
dot, to contact the sacral
base line
The distance between
each of these
intersections on the
sacral base line should
be measured (left to S2,
right to S2).
Display measurements
just medial to the left and
right sacral dots.
L1
L2
L3
L4
.
.
. 60
.
L5
.
.
55 .
.
.
168
163
.
.
2
.
Gonstead
Pelvic
Analysis
•
L1
L2
L3
Calculate the Measured
Deficiency (m.d.)
–
–
–
Extend a line horizontally
from most superior aspect
of the higher of the two
femur heads to overly the
lower femur head. This line
would be best represented
by a short line above the
lower femur head.
Measure the true vertical
distance from the most
superior aspect of the lower
femur head to the line (from
the previously placed dot to
the line).
Record the measurement
adjacent to the end of the
horizontal line with the label
“MD” (as pictured)
L4
.
.
. 60
.
L5
.
.
55 .
.
.
168
163
.
.
2
.
3MD
Gonstead
Pelvic
Analysis
•
•
•
•
•
•
Place a dot on the most
lateral aspect of the right
iliac wing
Place a dot on the most
medial aspect of the
posterior superior iliac
spine
Lines perpendicular to
the femur head line
should be drawn through
these dots
Measure perpendicular
distance between the
resultant lines
Display measurement
just medial to the lateral
dot
Repeat for the left side
L1
L2
L3
L4
.
.
. 60
. 89
.
L5
.
.
.
55 .
.
.
83 .
.
168
163
.
.
2
.
3MD