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Correcting Tracings for the Lumbo-Sacral A-P Control LSO

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.

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Correcting Tracings for the Lumbo-Sacral A-P Control LSO

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  1. Correcting Tracings for the Lumbo-Sacral A-P Control LSO

  2. Correcting Tracings • Given tracings and an orthometry form you will prepare a “blueprint” to be used when fabricating the LSO

  3. Correcting Tracings • You will begin by correcting the pelvic and thoracic bands

  4. Correcting Tracings • Both bands are corrected the same way so begin with the pelvic band

  5. 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 ¸

  6. 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” ¸

  7. 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” ¸

  8. 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

  9. 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

  10. 2” 2” 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

  11. 2” 2” Adjusting Band Tracing • Draw a line across the tracing at that position.

  12. 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

  13. Sacro-coccyx junction 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 Inferior angle of the scapula S

  14. Adjusting Paraspinal Bar Tracing • The lower mark is referred to as the corrected inferior mark Inferior angle of the scapula S Sacro-coccyx junction (corrected inferior mark)

  15. 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 Inferior angle of the scapula S Adjusted inferior level Sacro-coccyx junction (corrected inferior mark)

  16. 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 1 1/4” Adjusted superior level Adjusted inferior level Sacro-coccyx junction 3/4” (corrected inferior mark)

  17. 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 Inferior angle of the scapula S 1 1/4” Adjusted superior level 1 1/2” Thoracic band bend mark Adjusted inferior level Sacro-coccyx junction 3/4” (corrected inferior mark)

  18. 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 Inferior angle of the scapula S 1 1/4” Adjusted superior level 1 1/2” Thoracic band bend mark Pelvic band bend mark Adjusted inferior level 1 1/2” Sacro-coccyx junction 3/4” (corrected inferior mark)

  19. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 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 S Thoracic band bend mark Pelvic band bend mark

  20. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Adjusting Paraspinal Bar Tracing • Draw lines 1 1/2” long up and down from their respective bend marks S S Thoracic band bend mark Pelvic band bend mark

  21. S Thoracic band bend mark 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Pelvic band bend mark Adjusting Paraspinal Bar Tracing • Your finished tracing should look like this

  22. Adjusting Paraspinal Bar Tracing • With the bands attached

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