COF COF Neuromuscular Conditions & Orthotics 4 — Questions and Answers
Question 1: A patient with Charcot-Marie-Tooth disease presents with bilateral foot drop and cavus foot deformity. Which orthotic feature is MOST critical to address the cavus component?
- Metatarsal pad to offload the metatarsal heads
- Accommodative total contact footbed with rigid lateral heel post (Correct answer)
- Solid ankle AFO with plantar flexion stop
- Supramalleolar orthosis with medial wedge
Correct answer: Accommodative total contact footbed with rigid lateral heel post
Cavus foot in CMT requires a total contact accommodative footbed with lateral heel posting to redistribute pressure and correct the varus heel position.
Question 2: Which gait deviation is MOST commonly associated with weak hip abductors in a patient with muscular dystrophy?
- Steppage gait
- Trendelenburg gait (Correct answer)
- Scissor gait
- Antalgic gait
Correct answer: Trendelenburg gait
Trendelenburg gait occurs when weak hip abductors cannot stabilize the pelvis, causing it to drop toward the unsupported side during single-limb stance.
Question 3: A child with spinal muscular atrophy type II requires standing support. Which orthosis would BEST provide upright positioning while accommodating trunk weakness?
- Dynamic ankle foot orthosis (DAFO)
- Hip-knee-ankle-foot orthosis (HKAFO) with trunk support (Correct answer)
- Ground reaction AFO
- Knee-ankle-foot orthosis (KAFO) alone
Correct answer: Hip-knee-ankle-foot orthosis (HKAFO) with trunk support
An HKAFO with trunk support provides the comprehensive skeletal support needed for a child with SMA type II who lacks the trunk and lower extremity strength for independent standing.
Question 4: In multiple sclerosis, orthotic intervention is complicated by which factor MOST likely to cause rapid changes in fit?
- Progressive spasticity patterns
- Fluctuating edema from heat sensitivity (Correct answer)
- Rapid bone density loss
- Unpredictable episodes of hypertonia
Correct answer: Fluctuating edema from heat sensitivity
Heat sensitivity (Uhthoff's phenomenon) in MS can cause rapid limb volume changes due to fluctuating edema, requiring adjustable orthotic systems.
Question 5: A patient with post-polio syndrome develops new weakness in a previously stable limb. The fitter observes recurvatum during stance. Which AFO design addresses this BEST?
- Posterior leaf spring AFO
- Floor reaction AFO (anterior shell) (Correct answer)
- Rigid AFO with plantarflexion stop only
- Dynamic response carbon fiber AFO
Correct answer: Floor reaction AFO (anterior shell)
A floor reaction (anterior shell) AFO applies an anterior force to the tibia during loading response, preventing knee hyperextension (recurvatum) in patients with weak quadriceps.
Question 6: When fitting a patient with hereditary spastic paraplegia, the fitter notes strong plantar flexion spasticity. Which trim line modification to an AFO would BEST manage spastic equinus while maintaining function?
- Anterior trim lines brought forward to increase rigidity (Correct answer)
- Posterior trim lines moved anteriorly to reduce lever arm resistance
- Trim lines extended proximal to the fibular head
- Flared lateral trim lines only
Correct answer: Anterior trim lines brought forward to increase rigidity
Moving the anterior trim lines forward increases AFO rigidity and provides greater resistance against plantarflexion spasticity to maintain the foot in a functional position.
Question 7: A patient with Friedreich's ataxia presents with progressive scoliosis and lower extremity ataxia. Which orthotic priority should be addressed FIRST?
- Custom TLSO for scoliosis management
- AFO to control ataxic gait (Correct answer)
- Knee orthosis for proprioceptive feedback
- Foot orthosis for sensory substitution
Correct answer: AFO to control ataxic gait
Ataxic gait instability poses an immediate fall risk; AFOs providing medial-lateral stability should be prioritized first to ensure safe ambulation.
COF COF Neuromuscular Conditions & Orthotics 4
A patient with Charcot-Marie-Tooth disease presents with bilateral foot drop and cavus foot deformity.
Which orthotic feature is MOST critical to address the cavus component?