NPTE-PT Therapeutic Modalities Application 2 — Questions and Answers
Question 1: A patient with chronic plantar fasciitis is treated with low-level laser therapy (LLLT). Which mechanism best explains its therapeutic effect?
- Thermal heating of deep tissue
- Photobiomodulation promoting cellular ATP production (Correct answer)
- Cavitation of plantar fascia fibers
- Eddy current induction in superficial tissue
Correct answer: Photobiomodulation promoting cellular ATP production
LLLT works through photobiomodulation, stimulating mitochondrial activity and increasing ATP production to promote healing.
Question 2: When applying phonophoresis with hydrocortisone to a patient's lateral epicondyle, which ultrasound parameter best facilitates transdermal drug delivery?
- 3 MHz continuous mode at 1.5 W/cm²
- 1 MHz pulsed 20% duty cycle at 0.5 W/cm²
- 1 MHz continuous mode at 1.0 W/cm² (Correct answer)
- 3 MHz pulsed 50% duty cycle at 2.0 W/cm²
Correct answer: 1 MHz continuous mode at 1.0 W/cm²
1 MHz continuous ultrasound penetrates deeper and the continuous mode maximizes acoustic streaming to enhance drug penetration into deeper tissue.
Question 3: A PT is using interferential current (IFC) for pain modulation in a post-operative knee patient. The beat frequency most effective for endorphin release is:
- 1–10 Hz (Correct answer)
- 80–150 Hz
- 50–100 Hz
- 150–200 Hz
Correct answer: 1–10 Hz
Low beat frequencies of 1–10 Hz stimulate endogenous opioid (endorphin) release for longer-lasting pain relief.
Question 4: Which condition is an absolute contraindication for applying thermotherapy (moist heat pack) locally?
- Subacute muscle strain
- Peripheral vascular disease with impaired circulation (Correct answer)
- Chronic low back pain
- Delayed-onset muscle soreness
Correct answer: Peripheral vascular disease with impaired circulation
Peripheral vascular disease impairs heat dissipation, creating a risk of thermal burns and tissue damage with local heat application.
Question 5: A PT applies cryotherapy immediately after acute ankle inversion sprain. Which physiological effect is the PRIMARY goal in this phase?
- Increasing local metabolic rate
- Reducing secondary hypoxic injury by decreasing tissue metabolism (Correct answer)
- Promoting collagen synthesis
- Increasing nerve conduction velocity
Correct answer: Reducing secondary hypoxic injury by decreasing tissue metabolism
Cryotherapy reduces local tissue metabolism, limiting secondary hypoxic injury in cells surrounding the primary trauma zone.
Question 6: During TENS application for pain relief using the conventional (high-rate) mode, which sensory response indicates correct electrode placement and intensity?
- Visible muscle twitch with mild discomfort
- Strong noxious sensation without muscle contraction
- Comfortable tingling or paresthesia without muscle contraction (Correct answer)
- Mild burning sensation over the electrodes
Correct answer: Comfortable tingling or paresthesia without muscle contraction
Conventional high-rate TENS targets large-diameter sensory fibers, producing comfortable paresthesia without motor activation.
Question 7: A therapist uses fluidotherapy on a patient's hand following Dupuytren's contracture release. Which unique benefit does fluidotherapy offer over paraffin bath?
- Lower treatment temperature range
- Ability to perform active exercise during treatment (Correct answer)
- Greater depth of thermal penetration
- Shorter treatment duration required
Correct answer: Ability to perform active exercise during treatment
Fluidotherapy allows the patient to actively move and exercise the extremity during treatment, combining heat with functional activity.
NPTE-PT Therapeutic Modalities Application 2
A patient with chronic plantar fasciitis is treated with low-level laser therapy (LLLT).
Which mechanism best explains its therapeutic effect?