Effect of low-level laser therapy (LLLT) on viscoelasticity of the contracted knee joint: comparison with whirlpool treatment in rats.

Abstract:

BACKGROUND AND OBJECTIVE:The purpose of this study was to compare the effect of Low-Level Laser Therapy (LLLT) with sham and whirlpool treatment on the contracted knee joint in rat. STUDY DESIGN/MATERIALS AND METHODS:Forty-eight Wistar rats were operated on to immobilize knee joint, and 1 week after operation they were randomly assigned to four treatment groups: laser 40 mW (3.9 W/cm2), laser 60 mW (5.8 W/cm2), whirlpool (42 degrees C), and sham laser. Tunable Ga-Al-As semiconductor (810 nm) laser was used for another 2 weeks of treatment. Removing and preparing bilateral hind legs, degree of knee contracture was assessed by measuring the knee flexion angle, weight of the gastrocnemius muscle, and periarticular connective tissue viscoelasticity measuring phase-lag and stiffness. RESULTS AND CONCLUSION:Laser irradiation showed no significant changes except the phase-lag of laser 60 mW. Under the conditions of this study, LLLT stimulation did not provide a significant effect for minimizing the degree of experimental joint contracture over whirlpool treatment.

journal_name

Lasers Surg Med

authors

Usuba M,Akai M,Shirasaki Y

doi

10.1002/(sici)1096-9101(1998)22:2<81::aid-lsm3>3.0

subject

Has Abstract

pub_date

1998-01-01 00:00:00

pages

81-5

issue

2

eissn

0196-8092

issn

1096-9101

pii

10.1002/(SICI)1096-9101(1998)22:2<81::AID-LSM3>3.0

journal_volume

22

pub_type

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