Mixed Deck — All CO Topics Flashcards

When a pediatric patient with osteogenesis imperfecta (brittle bone disease) presents for orthotic management, the orthotist should modify standard clinical practice by:

Answer: Avoiding all contact forces during casting and fitting to minimize fracture risk

Patients with osteogenesis imperfecta are at high risk for fractures from minimal force; casting, fitting, and adjustments must use extremely gentle, minimal-force techniques.

A patient reports seeing halos around lights at night and has a relative afferent pupillary defect. The most likely diagnosis is:

Answer: Optic neuritis with asymmetric optic nerve disease

An RAPD indicates asymmetric optic nerve or retinal disease; halos plus RAPD together may suggest acute glaucoma or optic neuropathy causing both symptoms.

A patient taking anticonvulsants long-term presents with a gait ataxia and a request for an AFO. What should the orthotist prioritize in the clinical evaluation?

Answer: Assess fall risk and determine whether the AFO will address the ataxic component of gait

Anticonvulsant-induced ataxia requires careful fall risk assessment, as an AFO alone may not adequately address a cerebellar gait pattern and additional safety measures may be needed.

When using a prism bar to measure a horizontal deviation, the prism base direction should be oriented in which direction to neutralize an esotropia?

Answer: Base-out

Base-out prisms neutralize esotropia by shifting the image toward the deviated eye, allowing the cover-uncover test to show neutralization.

A minor patient (age 14) wants their diagnosis kept from their parents. In most US states, what governs disclosure of routine orthoptic findings?

Answer: Parents or legal guardians retain the right to access minor children's medical records unless specific exceptions apply

In the US, parents generally have access to their minor child's records; HIPAA defers to state law, with limited exceptions for emancipated minors or specific sensitive services.

The optic nerve exits the eye through which structure and is surrounded by an extension of the meninges?

Answer: The lamina cribrosa of the sclera

The optic nerve exits through the lamina cribrosa, a sieve-like region of the sclera, and is surrounded by extensions of the dura, arachnoid, and pia mater.

An orthotist's certification lapses, but they continue to practice and bill using their expired credentials. This constitutes:

Answer: Fraud and misrepresentation of credentials

Practicing with lapsed credentials and misrepresenting certification status is fraudulent and a serious ethical and legal violation.

Which pattern of optic disc appearance is expected in a patient with longstanding increased intracranial pressure?

Answer: Bilateral disc edema (papilledema)

Papilledema—bilateral optic disc swelling—is the hallmark of raised intracranial pressure transmitted along the optic nerve sheaths.

When performing a cover-uncover test on a child, a refixation movement of the uncovered eye indicates which condition?

Answer: Heterotropia (manifest deviation)

If the uncovered eye moves to take up fixation when the other eye is covered, a manifest tropia (heterotropia) is present in that eye.

When writing a treatment plan for a unilateral transtibial amputee, what is the primary biomechanical purpose of a prosthetic sock fit check at each visit?

Answer: Evaluate residual limb volume changes affecting socket fit

Residual limb volume fluctuates due to activity, edema, and tissue remodeling; sock ply adjustments ensure proper socket fit and prevent skin breakdown.

The AAPOS guidelines recommend that vision screening in children should begin at which age?

Answer: 3 years

AAPOS and AAP guidelines recommend that all children have a vision screening at age 3 years, when cooperation allows photo-screening or acuity testing.

Which position is generally recommended for a conscious patient in diabetic shock (hypoglycemia) who is still alert enough to swallow?

Answer: Seated upright and given oral glucose or juice

An alert hypoglycemic patient who can swallow should be given fast-acting oral carbohydrates while seated to raise blood glucose quickly.

The Bielschowsky head tilt test is positive (hypertropia increases on ipsilateral head tilt) with palsy of which muscle?

Answer: Ipsilateral superior oblique

On ipsilateral head tilt, the ipsilateral superior oblique and superior rectus are stimulated; if the superior oblique is paretic, the superior rectus acts unopposed causing hypertropia.

Accommodation is primarily achieved by which change in the crystalline lens?

Answer: The lens becomes more convex due to ciliary muscle contraction and zonule relaxation

During accommodation, ciliary muscle contraction causes the zonular fibers to relax, allowing the inherently elastic lens to become more convex (increased curvature) and thus more powerful.

What is the minimum contact time (wet time) required for most EPA-registered intermediate-level disinfectants to be effective?

Answer: The time specified on the product label

Disinfectants must remain wet on the surface for the dwell time stated on their EPA-registered label to achieve claimed efficacy.

The Bagolini striated lens test is used to evaluate which aspect of binocular vision?

Answer: Retinal correspondence and suppression

Bagolini striated lenses test retinal correspondence and suppression under near-natural viewing conditions by creating streak images from a point source.

A patient presents with Charcot-Marie-Tooth disease and bilateral foot drop. The treatment plan should include which primary orthotic consideration?

Answer: Bilateral custom AFOs to assist dorsiflexion during gait

CMT causes progressive peroneal and anterior tibialis weakness; bilateral custom AFOs provide dorsiflexion assistance during swing and midfoot stability during stance.

Convergence insufficiency is MOST reliably treated with:

Answer: Office-based vergence/accommodative therapy

The CITT study demonstrated that office-based vergence/accommodative therapy is significantly more effective than home-based pencil push-ups for symptomatic convergence insufficiency.

When is it ethically permissible to share a patient's protected health information with their employer?

Answer: When the patient provides specific written authorization for that disclosure

PHI can only be disclosed to employers when the patient has specifically authorized that release in writing.

When is it appropriate for a Certified Orthotist to independently adjust a patient's prescription medication to manage orthotic-related pain?

Answer: Never; medication management is outside the orthotist's scope of practice

Adjusting prescription medications is strictly within the physician's scope of practice; orthotists must refer patients to the prescribing physician for any medication changes.