or-pr 164 task 1 competency 3 lay out the kafo for fabrication
TRANSCRIPT
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OR-PR 164
Task 1 Competency 3Lay Out the KAFO for Fabrication
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Objective Supplied with a full
leg tracing and a completed orthometry form you will create a “blueprint” to be used when fabricating the metal AFO
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Correct Ankle Dimensions Identify and mark
the apices of the medial and lateral malleoli
Lay out a line passing through the marks
Measure the width of the tracing between marks and mark midpoint
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Correct Ankle Dimensions Measure out ½ the
measured M-L from the orthometry form from the center and mark
½ measured M-L
½ measured M-L
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Correct Ankle Dimensions Redraw ankle
region, blending in with original tracing
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Correct Ankle Dimensions Measure medially
from medial malleolus 1 1/4” and mark
1 ¼”
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Correct Knee Dimensions Find approximate
knee joint center and draw horizontal line
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Correct Knee Dimensions Determine
midpoint of tracing Measure out ½ the
measured M-L from the orthometry form from the center and mark
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Correct Knee Dimensions Redraw knee
region, blending in with original tracing
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Correct Knee Dimensions Measure medially
from medial knee 5/8” and mark
5/8”
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Determine Mid-Saggital Line Draw a line
beginning at the perineum and passing through the knee and ankle marks
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Determine Mid-Saggital Line Genu Valgum is
indicated if the line passes through the knee mark but outside the ankle mark
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Determine Mid-Saggital Line Genu Varum is
indicated if the line passes outside the knee mark and through the ankle mark
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Lower Section Heights and Locations
1. Heel base2. Shoe thickness3. Ankle joint axis4. Fibular head5. 1 ½”below fib. head
(prox. edge of calf band) 6. 1 ½” below mark #5
(distal edge of calf band)
7. Medial tibial plateau8. Adductor tubercle9. Knee joint axis
12
45
3
6
7
89
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Upper Section Heights and Locations
10. Distal edge of distal thigh band (same distance from KC as prox. calf band)
11. 1 ½” above mark #10 12. Perineum13. Transfer mark #12 to
lateral side of tracing14. 1 ½” below perineum15. Transfer mark #14 to
lateral side of tracing16. 1 ½” below mark #14
12
11
10
9Knee
Center
1514
16
13
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Calf Band and Joint Axes
Project lines perpendicular to the mid-saggital line across the tracing for the : Shoe thickness at heel Ankle joint axis Proximal calf band Distal calf band Knee joint axis (halfway
between the medial tibial plateau and the adductor tubercle)
12
45
3
6
7
89
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Proximal and Distal Thigh Bands
Distal edge of distal thigh band
Proximal edge of distal thigh band
Proximal edge of proximal thigh band
Distal edge of distal thigh band
12
11
10
9Knee
Center
1514
16
13
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Ankle Joints and Stirrup Project a line
perpendicular to ankle axis from center of tracing down to heel thickness line
Measure out ½ the measured M-L from the orthometry form on either side of the center and mark
Ankle Axis
½ measured M-L
½ measured M-L
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Ankle Joints and Stirrup Measure out 1/4” medially
and 3/16” laterally from previous marks to create minimum clearance
Measure out another 1/8” on each side to compensate for ankle joint thickness
Project lines perpendicular to ankle axis extending from 2” superior to axis down to heel thickness line. The stirrup will be shaped along these lines
Ankle Axis
3/16”
1/4”
1/8”
1/8”
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Knee Joints Measure out 1/4”
medially and 1/8” laterally for minimum knee joint clearance
1/8”1/4”
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Calf Band Widths
Measure the width of the tracing along calf band lines and mark midpoints
Measure out ½ the measured M-L s from the orthometry form from the centers and mark
Knee Center
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Calf Band Widths
Measure out and mark 1/8” from established M-L to accommodate padding
Measure out and mark an additional 1/8” to accommodate band thickness
Connect the outer marks proximally to distally. The band will be contoured to the inside of these lines
Knee Center
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Proximal and Distal Thigh Band Widths
Measure the width of the tracing along the distal edge of the distal thigh band and the proximal edge of the proximal thigh band. Mark the midpoints
Measure out ½ the measured M-L from the orthometry form from the centers and mark
Knee Center
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Proximal and Distal Thigh Band Widths
Measure out and mark 1/8” from established M-L to accommodate padding
Measure out and mark an additional 1/8” to accommodate band thickness
Connect the outer marks proximally to distally. The bands will be contoured to the inside of these lines
Knee Center
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Completed Tracing Your completed
tracing is now ready to be used in your fabrication of the KAFO
END