Blay A, Blay C C, Groth E B et al. Surg Med Abstract Issue. Am Soc Laser Med Surg Abstracts, 2002 The effects of 680 and 830 nm lasers on osseointegration was studied by Blay. 30 adult rats were divided into three groups; two laser groups and one control. The rats in the two laser groups had pure titanium Frialit-2 implants implanted into each proximal metaphysis of their respective tibias, inserted with a 40 Ncm torque. The initial stability was monitored by means of a resonance frequency analyzer. Ten irradiations were performed, 48 hours apart, 4 J/cm2 on two points, starting immediately after surgery. Resonance frequency analysis indicated a significant difference between frequency values at 3 and 6 weeks, as compared to control. At 6 weeks the removal torque in the laser groups was much higher than in the control group.
Bjordal J M. A literature search identified 77 randomized clinical trials with LLLT, of which 18 included tendinitis. Three trials were excluded for lack of placebo control, of which one was comparative, another lacked patients with tendinitis in the treatment group, while the last unwittingly gave the placebo group active treatment. Four trials used too high power density or dose, and three did not expose the skin directly overlying the injured tendon. The remaining eight trials were included in a statistical pooling, where the mean effect of LLLT over placebo in tendinitis was calculated to 29.5% (19.5-39.0). LLLT with optimal treatment procedure/parameters can be effective in the treatment of tendinitis.
Shefer G, Partridge T A, Heslop L et al. Department of Animal Sciences, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel. PMID: 11896194 [PubMed – indexed for MEDLINE] J Cell Science. 2002; 115: 1461-1469. Low energy laser irradiation (LELI) has been shown to promote skeletal muscle cell activation and proliferation in primary cultures of satellite cells as well as in myogenic cell lines. Here, we have extended these studies to isolated myofibers. These constitute the minimum viable functional unit of the skeletal muscle, thus providing a close model of in vivo regeneration of muscle tissue. We show that LELI stimulates cell cycle entry and the accumulation of satellite cells around isolated single fibers grown under serum-free conditions and that these effects act synergistically with the addition of serum. Moreover, for the first time we show that LELI promotes the survival of fibers and their adjacent cells, as well as cultured myogenic cells, under serum-free conditions that normally lead to apoptosis. In both systems, expression of the anti-apoptotic protein Bcl-2 was markedly increased, whereas expression of the pro-apoptotic protein BAX was reduced. In culture, these changes were accompanied by a reduction in the expression of p53 and […]
Akai M, Usuba M, Maeshima T, Shirasaki Y, Yasuoka S. Department of Physical Therapy, Tsukuba College of Technology, Ibaraki, Japan. firstname.lastname@example.org PMID: 9365959 [PubMed – indexed for MEDLINE] Lasers Surg Med. 1997. 21(5): 480-4. The influence of low-level (810 nm)) laser on bone and cartilage during joint immobilization was examined with rats’ knee model. The hind limbs of 42 young Wistar rats were operated on in order to immobilize the knee joint. They were assigned to three groups 1 wk after operation; irradiance 3.9 W/cm2, 5.8 W/cm2, and sham treatment. After 6 times of treatment for another 2 wk both hind legs were prepared for 1) indentation of the articular surface of the knee (stiffness and loss tangent), and for 2) dual energy X-ray absorptiometry (bone mineral density) of the focused regions. The indentation test revealed preservation of articular cartilage stiffness with 3.9 and 5.8 W/cm2 therapy. Soft laser treatment may possibly prevent biomechanical changes by immobilization.
Toshio Ohshiro (1), Katsumi Sasaki (2), Shouhei Yasuda (2), Shunji Fujii (3), Takafumi Ohshiro (3), Takeo Touno (4), Shigeru Matsumoto (4) 1) Japan Medical Laser Laboratory , 2) Oshiro Clinic, 3) Keio University Dept. of Plast. and Reconst. Surgery, 4) Nihon Sport Science University. The Journal of Laser Therapy MILLENNIUM EDITION • VOLUMES 12 & 13 Sumo Wrestling is the only national endorsed sport in Japan. Professional Sumo Wrestlers belong to the Nihon Sumo Kyokai (Japan Sumo Wrestling Association). Sumo Wrestling meets bimonthly, 6 times a year. Each Sumo sessions has 15 days where the Wrestlers must wrestle for 15 consecutive days against 15 different opponents. This national sport is popular and there are many Sumo Wrestling Teams for all ages. The strongest person from these teams are recruited to the Nihon Sumo Kyokai and become professional. Most Sumo Wrestlers have some symptoms such a pain due to prior injuries and their hard training. We recently had the opportunity to perform Laser Therapy on 6 Sumo Wrestlers who were complaining of various symptoms. We would like to explain about the removal of those symptoms by LLLT, and how Laser therapy affected their performance. All 6 performed better both subjectively […]