Ankle Orthoses Flashcards Preview

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Flashcards in Ankle Orthoses Deck (16)
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1
Q

Types of AFO designs

A

Conventional

Thermoplastic

Floor Reaction

Anterior Shell & PTB

2
Q

Rigidity of thermoplastic AFO is influenced by a variety of factors

A

Type of plastic

Thickness of plastic

Trimlines

  • Anterior to malleoli results in increased A-P and M-L rigidity
  • Posterior to malleoli - Posterior leaf spring design, flexible at the ankle with somewhat of a dorsiflexion spring assist, does not maintain stability of hte ankle

Corrugations vacuum formed in place- carbon fiber inserts or rope modifications

3
Q

Advantages of Conventional AFO

A

Dorsi/plantarflexion ROM easily adjusted

Limited skin contact

Edema accomodated

Permanent shoe attachment = compliance when wearing shoe

4
Q

Disadvantages of Conventional AFO

A

Heavy

Shoes not easily changed

Cosmetics

Mediolateral control of ankle/foot not as good as in thermoplastic

5
Q

Advantages of thermoplastic AFO

A

Lightweight

Shoe easily changeable

Cosmetically acceptable

Total contact increases control

Knee stability readily influenced by minor changes in orthosis or sole of shoes

6
Q

Disadvantages of thermoplastic AFO

A

Limited Adjustability

Rigidity can not be increased

Fixed heel height

Intimate fit does not accommodate edema or changes in volume

Localized pressure and callus formations may occur over time

Insensitive skin must be closely monitored for breakdown

7
Q

Contraindications for articulated thermoplastic AFO

A

Uncontrolled spasticity- motion at ankle increases spasticity

Severe pronation in midstance from uncontrolled tibial internal rotation

Genu valgus or varus deformities

Over lengthening of the Achilles tendon

8
Q

Floor Reaction

A

1

9
Q

Floor Reaction2

A

1

10
Q

Anterior shell/PTB Indications

A

Provides rigid ankle support

Charcot joint, severely painful

External support for tibial fractures (dsital 2/3 only)

Additional support of ORIF (open rediuction internal fixation) of tibia, distal to tibial tubercle

Post operative fusions of the ankle

Avascular necrosis of the talar body

11
Q

Anterior shell/PTB

A

1

12
Q

Types of Conventional AFO stirrups

A

Solid - does not allow for shoes changes, length dependent on m-l stability

Split - allows detachment of uprights, shoe exchange possible, can be incorporated into a plastic foot section so that patient no required to modify shoes to accommodate stirrups/uprights

Round - attached directly to uprights without ankle joints
- results in axis distal to anatomical axis

13
Q

Indications for limited ROM joints

A

Permits limited plantar/dorsiflexion as desired

Indicated to limit painful ROM

For weak muscle control

14
Q

Contraindication to Dorsiflexion assist (Klenzak)

A

Spring dorsiflexion assist may trigger spastic gastroc-soleus

You plantar-stop instead for foot drop/dorsi weakness

15
Q

Indications for Dorsiflexion Stop

A

Free plantar flexion

Active dorsiflexion, absent plantarflexors

Stabilize against undesirable dorsiflexion on later half of stance phase

Prevents early knee flexion

16
Q

Indications for Plantarflexion Stop

A

Unlimitied