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International Journal of Photoenergy
Volume 2014, Article ID 785386, 6 pages
Research Article

Effects of Low-Level Laser Therapy and Eccentric Exercises in the Treatment of Patellar Tendinopathy

1Laboratory of Laser Sports Medicine, South China Normal University, Guangzhou 510006, China
2Sichuan University for Nationalities, Sichuan 626001, China

Received 18 April 2014; Revised 4 July 2014; Accepted 7 July 2014; Published 16 July 2014

Academic Editor: Timon Cheng-Yi Liu

Copyright © 2014 Xiao-Guang Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The study aims to investigate if low-level laser therapy (LLLT) combined with eccentric exercises could more effectively treat patellar tendinopathy than LLLT alone and eccentric exercises alone. Twenty-one patients with patellar tendinopathy were randomized to three groups: laser alone, exercise alone, or laser plus exercise, with seven in each group. Laser irradiations were administered at the inferior pole of the patella and the two acupoints of Extra 36 (Xiyan) with the intensity of 1592 mW/cm2. Eccentric training program consisted of three sets of 15 repetitions of unilateral squat on level ground. All patients received six treatments per week for four weeks. Knee pain and function and quadriceps muscle strength and endurance were evaluated at baseline and the end of treatment. After the 4-week intervention, all groups showed significant improvements in all the outcomes ( ). The laser + exercise group had significantly greater improvements in all the outcomes than the other two groups ( ), except nonsignificant difference in pain relief between the laser + exercise group and the laser group. In conclusion, LLLT combined with eccentric exercises is superior to LLLT alone and eccentric exercises alone to reduce pain and improve function in patients with patellar tendinopathy.