Orthotics Lab 2: Knee Ankle Foot Orthoses (2/10/17)

Question 1

what movements are restricted by the Supracondylar Shell KAFO or a Floor Reaction Orthosis

Answer 1

knee - hyperextension, valgus, and varus

foot - some PF, DF, supination, pronation

Question 2

page 13 for 3 point pressure systems

Answer 2

yings

Question 3

how is the Supracondylar Shell KAFO or a Floor Reaction Orthosis unique (regarding the ankle joint)

Answer 3

it is set in PF and supported by an appropriate height heeled shoe

Question 4

how does the set PF and support from an appropriate height heeled shoe for the Supracondylar Shell KAFO or a Floor Reaction Orthosis influence biomechanical alignment

Answer 4

the weight is shifted anteriorly toward the ball of the foot

this shifts the ground reaction force more anteriorly

the knee is biased toward extension and the hip toward flexion

Question 5

what are typical indications for the Supracondylar Shell KAFO or a Floor Reaction Orthosis

Answer 5

when the patient demonstrates a crouched (flexed) gait pattern

Question 6

what is the Conventional KAFO

Answer 6

Double Metal Upright KAFO

Question 7

what motions are restricted by the Double Metal Upright KAFO

Answer 7

hyperextension, flexion, valgus, varus

pronation, supination

Question 8

page 16 3 point pressure systems

Answer 8

yings

Question 9

knee joints within a KAFO are designed to be locked in a _____ position (most commonly ______)

Answer 9

…locked in a stationary position. most commonly full extension

Question 10

what is the most basic style of joint incorporated into most KAFO designs

Answer 10

single axis knee joint

Question 11

a single axis knee joint may be ______

Answer 11

offset

Question 12

an offset knee joint is located _____ to the knee

Answer 12

posterior

Question 13

by the offset knee joint being posterior to the knee, what type of motion is increased

Answer 13

extension moment (at the knee)

Question 14

an offset knee joint is not appropriate for someone with…

Answer 14

spasticity

Question 15

a ________ knee joint allows the knee joint to be locked even through the patient may not possess full knee extension

Answer 15

adjustable or fan design knee joint

Question 16

advantages to the ring or drop lock release mechanism

Answer 16

inexpensive and simple in design (requires little maintenance/chance of breakdown)

Question 17

typical indications for a KAFO

Answer 17

when there is compromised motor control at the foot, ankle, knee, hip.

Question 18

in SOME KAFOs, the ankle joint may be set in approximately #? degrees of DF

Answer 18

10

Question 19

what motions are restricted by the Custom Molded Plastic KAFO

Answer 19

same as metal KAFO (hyperextension, flexion, valgus, varus)

pronation, supination

Question 20

what do both metal KAFOs and plastic KAFOs assist with

Answer 20

upright function by controlling the knee and ankle (and indirectly influencing hip position)

Question 21

benefits of the Plastic Metal Hybrid KAFO

Answer 21

the patient gets flexibility in brace length and can be worn under clothes (cosmetically beneficial)