PAM Light & Laser Therapy 2

Question 1

Which laser classification (Class) is most commonly used in clinical low-level laser therapy (LLLT) for musculoskeletal conditions?

Accepted Answer

Class 3B

Answer

Class 3B lasers (1–500 mW) are the most common for clinical LLLT, delivering therapeutic doses without the tissue ablation risk of Class 4.

Question 2

A patient with rheumatoid arthritis is referred for photobiomodulation. Which wavelength range is MOST appropriate to penetrate synovial tissue effectively?

Accepted Answer

780–1000 nm (near-infrared)

Answer

Near-infrared wavelengths (780–1000 nm) penetrate deepest into tissue, reaching synovial structures up to several centimeters below the skin.

Question 3

The Arndt-Schulz law applied to laser therapy states that:

Accepted Answer

Weak stimuli excite, optimal stimuli enhance, and excessive stimuli inhibit biological activity

Answer

The Arndt-Schulz law describes a biphasic dose-response where sub-threshold stimuli are ineffective, optimal doses stimulate, and excessive doses inhibit.

Question 4

Which property distinguishes laser light from ordinary light produced by a lamp?

Accepted Answer

Monochromaticity, coherence, and collimation

Answer

Laser light is uniquely monochromatic (single wavelength), coherent (waves in phase), and collimated (parallel beams), unlike broadband lamp emissions.

Question 5

When applying low-level laser therapy over a superficial skin wound, the recommended application technique is:

Accepted Answer

Contact or near-contact stationary probe placement at grid points

Answer

Grid-point contact or near-contact application ensures consistent dosing across the wound area and maximizes energy delivery to target tissue.

(PAM) Physical Agent Modalities Certification Practice Test

(PAM) Physical Agent Modalities Certification Practice Test

PAM Light & Laser Therapy 2