CTO Patient Evaluation & Measurement 4 — Questions and Answers
Question 1: The 'neutral calcaneal stance position' (NCSP) is most accurately measured using which technique?
- Goniometric measurement of the calcaneus relative to the supporting surface while the patient stands (Correct answer)
- Non-weight-bearing bisection of the posterior calcaneus
- Observation of rearfoot valgus during single-limb stance
- Weight-bearing X-ray of the calcaneal pitch angle
Correct answer: Goniometric measurement of the calcaneus relative to the supporting surface while the patient stands
NCSP is a weight-bearing measure obtained by bisecting the posterior calcaneus and measuring its angle relative to the floor while the patient stands in a neutral subtalar position.
Question 2: When documenting circumferential measurements for a custom spinal orthosis, measurements are typically recorded at which intervals along the torso?
- Every 10 cm from axilla to pelvis
- At standardized anatomical landmarks only (axilla, waist, iliac crest)
- Every 2 cm from the intended proximal to distal trim lines (Correct answer)
- At the apex of spinal curvature only
Correct answer: Every 2 cm from the intended proximal to distal trim lines
Circumferential measurements taken every 2 cm across the intended orthosis coverage area allow accurate reconstruction of torso contour for custom fabrication.
Question 3: A patient scheduled for wrist-hand orthosis (WHO) fitting is assessed for intrinsic muscle tightness. Which test distinguishes intrinsic from extrinsic finger flexor tightness?
- Phalen's test
- Bunnel-Littler test (Correct answer)
- Finkelstein test
- Froment's sign
Correct answer: Bunnel-Littler test
The Bunnel-Littler test differentiates intrinsic tightness from joint contracture by comparing passive PIP flexion with the MCP in extension versus slight flexion.
Question 4: During evaluation for a thoracic hyperkyphosis orthosis, a patient's Cobb angle is measured at 62°. This value is used primarily to:
- Determine the orthosis trim-line placement on radiographs
- Select the appropriate pad placement to apply corrective three-point forces (Correct answer)
- Calculate the patient's respiratory capacity
- Identify the need for surgical referral
Correct answer: Select the appropriate pad placement to apply corrective three-point forces
The Cobb angle quantifies the deformity magnitude, and the apex and end-vertebrae locations guide the positioning of the three corrective pads in a hyperextension orthosis.
Question 5: A patient with diabetic peripheral neuropathy is being evaluated for a custom foot orthosis. The primary evaluation tool used to identify plantar pressure hot spots is:
- Ink footprint (Harris mat)
- Semmes-Weinstein monofilament test
- In-shoe pedobarograph (Correct answer)
- Subtalar range of motion goniometry
Correct answer: In-shoe pedobarograph
In-shoe pedobarography maps dynamic plantar pressure distribution during walking, directly identifying high-pressure areas at risk for ulceration in neuropathic feet.
Question 6: Which measurement technique is used to determine the appropriate trim-line placement on an AFO to allow 5° of dorsiflexion assist?
- Goniometric measurement of passive ankle dorsiflexion range (Correct answer)
- Angle of trim line cut below the fibular head
- Width of the posterior shell at the malleolar trim line
- Ankle circumference at the widest point of the malleoli
Correct answer: Goniometric measurement of passive ankle dorsiflexion range
Passive ankle dorsiflexion ROM establishes the baseline joint motion available, which informs where the trim line is placed to allow or restrict that motion in the finished AFO.
Question 7: During pediatric scoliosis evaluation for bracing, the Risser sign is assessed because it indicates:
- The degree of lateral curvature in degrees
- Skeletal maturity and remaining spinal growth potential (Correct answer)
- The rotational component of the deformity
- Rib hump magnitude on Adam's forward bend test
Correct answer: Skeletal maturity and remaining spinal growth potential
The Risser sign grades iliac apophysis ossification from 0 to 5, indicating skeletal maturity and the likelihood that a scoliosis curve will progress, which directly impacts bracing decisions.
CTO Patient Evaluation & Measurement 4
The 'neutral calcaneal stance position' (NCSP) is most accurately measured using which technique?