Effects of the Whole Body Vibration Application and Exercise in Patients With Patellofemoral Pain Syndrome: a Randomized Controlled Trial.

Knee pain is a common condition with a high prevalence in the general population, being femoro-patellar pain one of the most common forms of knee pain (Crossley et al., 2016a). Its incidence ranges between 5.1% and 14.9% and its prevalence is between 16.3% and 28.9% in adolescents (Smith et al., 2018). Femoro-patellar pain is described as diffuse pain in the anterior area of the knee not caused by a traumatic action, which is aggravated when performing squats, running, going up and down stairs or sitting for a long time The recommended conservative treatment for this condition according to the 2016 Manchester and Australia 2017consensus is the therapeutic exercise, combining knee and hip exercises (Crossley et al., 2016b), mainly quadriceps and gluteus medius (Collins et al., 2018). INTERVENTION All participants will be assessed at baseline and at the end of treatment (discharge) by a blinded investigator. The program will consist of a routine of 18 exercises that will be executed where the greatest neuromuscular recruitment is sought. Most exercises are dynamic and isotonic. It is structured following the scheduled phases (ACSM, 2013) of warm-up, development and return to calm or stretching. The total duration of the program is 22 minutes, keeping the general lines of high-intensity aerobic interval training, which establishes a rest period at least equal to that of work. The treatment protocol will consist of 11 sessions applied in 4 weeks under an intervention regime of weeks 3 sessions, with a duration per session of 22 minutes, which will be supervised by a physiotherapist with more than 15 years of clinical experience. The experimental group will develop the exercise program on the whole body vibration platform, and control group on the switched-off vibration device (without any vibration stimuli) DESIGN AND STATISTICS This study will be a randomized clinical trial with a control group. It will consider an alpha or type I error of 95% and a beta or type II error of 80%, with a hypothesis to a tail. The randomized controlled trial will be performed with a single-blind (the evaluator who evaluated the outcome measures remained blinded to the participants' allocation group). The sample will be randomly selected through the randomized.com program among the patients that meet the inclusion criteria that we will be described later. Participants will be distributed equally between the control group and the experimental group. The research protocol will be carried out in accordance with the Declaration of Helsinki statement of ethics, legal and regulatory principles to provide guidance for research related to health in humans. The CONSORT guidelines have been the reference to design the Project, the ad will be used to make the final report.