correcting tracings for the lumbo-sacral a-p control lso
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Correcting Tracings for the Lumbo-Sacral A-P Control LSO
Correcting Tracings Given tracings and
an orthometry form you will prepare a “blueprint” to be used when fabricating the LSO
Correcting Tracings You will begin by
correcting the pelvic and thoracic bands
Correcting Tracings Both bands are
corrected the same way so begin with the pelvic band
Determining Band Lengths Locate the
circumference of the pelvis at the ASIS level on your orthometry form
Divide that number in half
Example: 35¸2=17 1/2 ¸
Determining Band Lengths If the original
circumference is 36” or under, add 1-1/2” to the result of the divided circumference to determine the corrected length of your band
Example:35”¸2 = 17 1/2”17 1/2” + 1 1/2”=19”
¸
Determining Band Lengths If the original
circumference is over 36”, add 2” to the result of the divided circumference to determine the corrected length of your band
Example:39”¸2=19 1/2”19 1/2” + 2”=21 1/2”
¸
Adjusting Band Tracing Divide the corrected
length in half Using a flexible tape
measure following the traced line, measure the resultant distance from the center line to both ends of the tracing and mark
Adjusting Band Tracing Connect those
marks with a straight line (transverse line)
Using a 90 triangle, draw a line perpendicular to the transverse line through the original center line
Adjusting Band Tracing Hold a ruler at 90
degrees to the adjusted center line and slide it down the line until the 2” mark just touches the curved tracing on both sides
Mark the points at which the rule touches the tracing
2” 2”
Adjusting Band Tracing Draw a line across
the tracing at that position. 2” 2”
Adjusting Band Tracing Draw a line across
the tracing at that position
Your completed corrected tracing will appear similar to this
Repeat the same procedures for the other band
Adjusting Paraspinal Bar Tracing On the paraspinal
tracing the S marks the inferior angle of the scapula
Using a flexible tape as before, follow the curves and mark the distance between the inferior angle of the scapula and the sacro-coccyx junction as indicated on the orthometry form
S
Sacro-coccyx junction
Inferior angle of the scapula
Adjusting Paraspinal Bar Tracing
The lower mark is referred to as the corrected inferior mark
S
Sacro-coccyx junction
Inferior angle of the scapula
(corrected inferior mark)
Adjusting Paraspinal Bar Tracing
Measure 3/4” up from this mark to determine the adjusted inferior level
This mark represents the bottom of the pelvic band
S
Sacro-coccyx junction
Inferior angle of the scapula
(corrected inferior mark)
Adjusted inferior level
Adjusting Paraspinal Bar Tracing
Measure 1 1/4” below the inferior scapular angle to determine the adjusted superior level
This mark represents the top of the thoracic band
S
3/4”
Adjusted inferior level Sacro-coccyx junction
(corrected inferior mark)
Adjusted superior level
1 1/4”
Adjusting Paraspinal Bar Tracing
Measure 1 1/2” below the corrected superior level to determine the thoracic band bend mark
This mark represents the bottom of the thoracic band
S Inferior angle of the scapula
3/4”
Adjusted inferior level
Adjusted superior level
1 1/4”
1 1/2”
Thoracic band bend mark
Sacro-coccyx junction
(corrected inferior mark)
Adjusting Paraspinal Bar Tracing
Measure 1 1/2” up from the adjusted inferior level to determine the pelvic band bend mark
This mark represents the top of the pelvic band
S Inferior angle of the scapula
3/4”
Adjusted inferior level
1 1/2”
Pelvic band bend mark
Adjusted superior level
1 1/4”
1 1/2”
Thoracic band bend mark
Sacro-coccyx junction
(corrected inferior mark)
Adjusting Paraspinal Bar Tracing
Place a ruler on the posterior side of the tracing
Move the ruler anteriorly until the edge touches the tracing at both the pelvic and thoracic band bend marks
S
Pelvic band bend mark
Thoracic band bend mark
S
1
2
3
4
5
6
7
8
9
10
11
1
2
13
1
4
15
16
1
7
18
1
9
2
0
Adjusting Paraspinal Bar Tracing
Draw lines 1 1/2” long up and down from their respective bend marks
S
Pelvic band bend mark
Thoracic band bend mark
S
1
2
3
4
5
6
7
8
9
10
11
1
2
13
1
4
15
16
1
7
18
1
9
2
0
Adjusting Paraspinal Bar Tracing
Your finished tracing should look like this
S
Pelvic band bend mark
Thoracic band bend mark
1
2
3
4
5
6
7
8
9
10
11
1
2
13
1
4
15
16
1
7
18
1
9
2
0
Adjusting Paraspinal Bar Tracing
With the bands attached
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