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Published byDeshaun Thayne Modified over 9 years ago
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Correcting Tracings for the Lumbo-Sacral A-P Control LSO
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Correcting Tracings Given tracings and an orthometry form you will prepare a “blueprint” to be used when fabricating the LSO
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Correcting Tracings You will begin by correcting the pelvic and thoracic bands
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Correcting Tracings Both bands are corrected the same way so begin with the pelvic band
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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 ¸
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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” ¸
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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”219 1/2” 19 1/2” + 2”=21 1/2” ¸
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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
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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
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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”
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Adjusting Band Tracing Draw a line across the tracing at that position. 2”
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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
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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
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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)
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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
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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”
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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)
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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)
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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 12 13 14 15 16 17 18 19 20
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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 12 13 14 15 16 17 18 19 20
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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 12 13 14 15 16 17 18 19 20
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Adjusting Paraspinal Bar Tracing With the bands attached
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