1. Task 1 Competency 3 Lay Out the KAFO for Fabrication
OR-PR 164
Task 1 Competency 3
Lay Out the KAFO for Fabrication

2. 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

3. 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

4. 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

5. Correct Ankle Dimensions
Redraw ankle region, blending in with original tracing

6. Correct Ankle Dimensions
Measure medially from medial malleolus 1 1/4” and mark
1 ¼”

7. Correct Knee Dimensions
Find approximate knee joint center and draw horizontal line

8. Correct Knee Dimensions
Determine midpoint of tracing
Measure out ½ the measured M-L from the orthometry form from the center and mark

9. Correct Knee Dimensions
Redraw knee region, blending in with original tracing

10. Correct Knee Dimensions
Measure medially from medial knee 5/8” and mark
5/8”

11. Determine Mid-Saggital Line
Draw a line beginning at the perineum and passing through the knee and ankle marks

12. Determine Mid-Saggital Line
Genu Valgum is indicated if the line passes through the knee mark but outside the ankle mark

13. Determine Mid-Saggital Line
Genu Varum is indicated if the line passes outside the knee mark and through the ankle mark

14. Lower Section Heights and Locations
Heel base
Shoe thickness
Ankle joint axis
Fibular head
1 ½”below fib. head (prox. edge of calf band)
1 ½” below mark #5 (distal edge of calf band)
Medial tibial plateau
Adductor tubercle
Knee joint axis 8 9 7 4 5 6 3 1 2

15. Upper Section Heights and Locations
Distal edge of distal thigh band (same distance from KC as prox. calf band)
1 ½” above mark #10
Perineum
Transfer mark #12 to lateral side of tracing
1 ½” below perineum
Transfer mark #14 to lateral side of tracing
1 ½” below mark #14 12 13 14 15 16 11 10 9
Knee
Center

16. 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) 8 9 7 4 5 6 3 1 2

17. Proximal and Distal Thigh Bands
Distal edge of distal thigh band
Proximal edge of distal thigh band
Proximal edge of proximal thigh band 12 13 14 15 16 11 10 9
Knee
Center

18. 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
½ measured M-L
Ankle Axis
½ measured M-L

19. 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
1/8”
3/16”
Ankle Axis
1/4”
1/8”

20. Knee Joints
Measure out 1/4” medially and 1/8” laterally for minimum knee joint clearance
1/4”
1/8”

21. 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

22. 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

23. 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

24. 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

25. Completed Tracing
Your completed tracing is now ready to be used in your fabrication of the KAFO
END