CLT Clinical Applications & Treatment Protocols 2 — Questions and Answers
Question 1: When treating a patient with chronic low back pain using low-level laser therapy (LLLT), which parameter is MOST critical to adjust based on tissue depth?
- Beam divergence
- Wavelength (Correct answer)
- Pulse frequency
- Spot size
Correct answer: Wavelength
Wavelength determines tissue penetration depth; near-infrared wavelengths (800–1064 nm) penetrate deeper than visible red wavelengths for reaching deeper structures.
Question 2: A patient presents with acute lateral epicondylitis. According to standard laser therapy protocols, the BEST approach is to:
- Apply high-power laser directly over the inflamed tendon at maximum dose
- Begin with lower doses and increase gradually as acute inflammation subsides (Correct answer)
- Avoid laser therapy entirely until inflammation resolves
- Use continuous wave mode only to maximize heating
Correct answer: Begin with lower doses and increase gradually as acute inflammation subsides
In acute conditions, starting with conservative lower doses reduces risk of exacerbating inflammation and allows tissue response to guide dose escalation.
Question 3: Which of the following conditions is considered a CONTRAINDICATION for laser therapy over the treatment area?
- Osteoarthritis of the knee
- Active malignancy at the treatment site (Correct answer)
- Chronic plantar fasciitis
- Post-surgical scar tissue
Correct answer: Active malignancy at the treatment site
Active malignancy at or near the treatment site is a contraindication because laser energy may stimulate cellular proliferation and tumor growth.
Question 4: During a laser therapy session for wound healing, the Arndt-Schulz Law suggests that:
- Higher doses always produce better therapeutic outcomes
- Minimal doses produce no effect regardless of frequency
- Optimal doses stimulate; excessive doses inhibit biological processes (Correct answer)
- Dose has no relationship to therapeutic outcome
Correct answer: Optimal doses stimulate; excessive doses inhibit biological processes
The Arndt-Schulz Law states that weak stimuli excite physiological activity, strong stimuli inhibit it — meaning optimal dosing is essential for therapeutic benefit.
Question 5: A laser therapist is treating trigger points in the upper trapezius. The MOST appropriate technique involves:
- Scanning the entire muscle belly with a broad beam
- Stationary application directly over each trigger point for calculated time (Correct answer)
- Applying laser through a water-soaked towel to reduce intensity
- Using the lowest available wavelength for superficial trigger points
Correct answer: Stationary application directly over each trigger point for calculated time
Trigger point protocols require stationary application over each discrete point for a calculated time to deliver the target dose to that specific location.
Question 6: Which photobiomodulation effect is PRIMARILY responsible for accelerated wound healing in laser therapy?
- Localized tissue heating above 45°C
- Increased mitochondrial ATP production via cytochrome c oxidase (Correct answer)
- Direct bactericidal destruction of wound pathogens
- Mechanical disruption of biofilm matrix
Correct answer: Increased mitochondrial ATP production via cytochrome c oxidase
Laser light is absorbed by cytochrome c oxidase in mitochondria, upregulating ATP production and accelerating cellular repair and proliferation in wounds.
Question 7: When treating a diabetic foot ulcer with laser therapy, the clinician should:
- Use higher-than-standard doses to compensate for impaired circulation
- Apply laser to perilesional tissue in addition to the wound bed (Correct answer)
- Avoid treating the wound bed to prevent thermal damage
- Limit treatment to once per month to avoid tissue overload
Correct answer: Apply laser to perilesional tissue in addition to the wound bed
Treating perilesional tissue in addition to the wound bed stimulates migration of healthy cells into the wound and enhances growth factor expression at the wound margins.
CLT Clinical Applications & Treatment Protocols 2
When treating a patient with chronic low back pain using low-level laser therapy (LLLT), which parameter is MOST critical to adjust based on tissue depth?