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Introduction: Description of a new surgical procedure (percutaneous lengthening and arthroscopic release, PLAR) that combines all the possible interventions on the iliotibial band (ITB), and evaluates its outcomes in a group of distance runners diagnosed with ITBS. Methods: A prospective observational study was made of distance runners diagnosed with ITBS and operated upon using the PLAR technique between 1 and 2018 and 31 June 2020. The surgical technique is described in detail, and the demographic data and functional outcomes measured by the sports performance scales Activity Rating Scale (ARS) and International Knee Documentation Committee (IKDC) are presented. Results: A total of 14 patients were included, with a mean follow-up of 16 months (range 12–42 months). All the patients resumed their previous sporting activity after an average of 4 (range 2.5-6) months, and no complications were recorded. In all cases, statistically significant improvement was evidenced by the ARS and IKDC scales following PLAR (p < 0.001), with excellent outcomes in 71% of the cases according to the ARS scale and in 86% according to the IKDC scale (mean difference between preoperative and final follow-up scores of 12.1/16 and 34.2/100 points, respectively). Conclusion: The PLAR technique is effective in allowing a return to previous sports performance levels in a short period of time among patients with ITBS refractory to conservative management, with a high satisfaction rate and the absence of complications. [ABSTRACT FROM AUTHOR]