OR-PR 164

Task 1 Competency 3Lay Out the KAFO for Fabrication

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

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

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

Correct Ankle Dimensions Redraw ankle

region, blending in with original tracing

Correct Ankle Dimensions Measure medially

from medial malleolus 1 1/4” and mark

1 ¼”

Correct Knee Dimensions Find approximate

knee joint center and draw horizontal line

Correct Knee Dimensions Determine

midpoint of tracing Measure out ½ the

measured M-L from the orthometry form from the center and mark

Correct Knee Dimensions Redraw knee

region, blending in with original tracing

Correct Knee Dimensions Measure medially

from medial knee 5/8” and mark

5/8”

Determine Mid-Saggital Line Draw a line

beginning at the perineum and passing through the knee and ankle marks

Determine Mid-Saggital Line Genu Valgum is

indicated if the line passes through the knee mark but outside the ankle mark

Determine Mid-Saggital Line Genu Varum is

indicated if the line passes outside the knee mark and through the ankle mark

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

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

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

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

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

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”

Knee Joints Measure out 1/4”

medially and 1/8” laterally for minimum knee joint clearance

1/8”1/4”

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

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

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

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

Completed Tracing Your completed

tracing is now ready to be used in your fabrication of the KAFO

END