ORTHOTICS CPM EXAM STUDY GUIDE

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ORTHOTICS CPM EXAM STUDY GUIDE

CORRECT SOLUTIONS.

AFO casting - correct answer- 1. Don gloves and gather materials

• Take measurements either on form or calf circumference,

ankle circumference, fib head height, foot length

• apply 2 layers of stockinette

4. mark landmarks: fib head/neck, tibial crest, malleoli,

calcaneal tuberosity if prominent, base of 5th met head, navicular, cuboid, met heads 1 and 5, to sulcus, any other prominent/painful areas

• apply cut tube anteriorly and insert into cut slits of stockinette
• wrap with fiberglass, ensure fib head is captured
• Use foot board to align foot as neutrally as possible
• As fiberglass sets draw vertical cut line and horizontal match

lines

• Use cast saw to cut the cast off. Warn patient of vibration

and loud noise. Use 2 hands and thumb as a guide

• cut top layer of stockinette and remove cast
• clean patients leg and remove 2nd layer stockinette. don

shocks and shoes

• Clean area and answer questions about patient

considerations

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KAFO: Knee joint too distal - correct answer- 1. pressure at

anterior distal and posterior proximal thigh

• thigh band shifts proximal
• cant rotate as much as anatomical knee

KAFO: knee joint too proximal - correct answer- 1. pressure at

posterior distal and anterior proximal of thigh

• thigh band shifts distal
• bends too much

KAFO: knee joint too posterior - correct answer- 1. pressure at

anterior proximal and posterior distal thigh

• orthosis shifts proximally

KAFO: knee joint too anterior - correct answer- 1. pressure at

anterior distal and proximal posterior thigh

• orthosis shifts distally

KAFO: proper knee joint location - correct answer- 1. bisection

of adductor tubercle and medial tibial plateau

• 60:40 anterior: posterior
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KAFO Trimlines: - correct answer- 1. medial proximal 30 mm

distal to perinneum

• proximal lateral distal to greater trochanter
• proximal posterior thigh set at 15 deg slant connecting lateral

to medial

• popliteal region allows 105 deg knee flexion

KAFO knee joint clearances - correct answer- 6mm medial 3 mm lateral

KAFO ankle clearances - correct answer- 6 mm medial and 5 mm lateral

KAFO analysis - correct answer- 1. Correct side and foot plate

• proper strapping materials
• plastic thickness
• rivets-- speedy rivets not durable for attaching metal uprights
• plastazote /p-cell packs down quickly
• check measurements
• Check proper ankle and knee joints
• If KAFO doesn't meet patient's needs do not deliver
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KAFO : varus moment control - correct answer- AFO section: 3 pt pressure 1) prox medial (medial chafe at tibial strap) 2) proximal lateral malleoli (lateral flange) 3) 1st met head (encompass)

KAFO hyperextension control after delivery - correct answer- 1) add padding to calf section 2) increase dorsiassist power (stiffer joints, adjust double action) 3) increase plantarflexion resistance (pf stop, adjust double action) 4) add heel wedge to AFO

KAFO joints that prevent hyperextension (without limiting ADLs)

• correct answer- 1. posterior offset

KAFO correct genuvarum/genuvalgum after delivery - correct answer- 1. add pull strap proximal and distal to the knee joint so line of pull corrects deformity

• add padding proximal and distal to KC (if valgus add padding

medially, and if varus add padding laterally) to increase corrective force

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