I decided to publish the study here on my website. This makes it accessible to everyone. You can download it, including all the appendices, as a pdf file. Publication at: https://bewegungsmedizin.org/kann-die-korpereigene-biomechanik-einen- signifikant-messbaren-wirkungsnachweis-bei-der-versorgung-mit-einlagen- geben/ LG, M. Weiß Proof of efficacy for the medicalcare of aids: Can the body's own biomechanics provide significant measurable evidence of effect in the fitting of insoles?Parallelstudy 2023 Parallelstudie 2023 Michael Weiß OSM (Master Orthopaedic Shoemaker, Chamber of Crafts, Munich) Abstract: Introduction: Everyone wears insoles in their shoes,.... sooner or later! How can the insert with the "best" effect be quantified for the patient? This study seeks to answer this question by using the degree of head rotation ability. Question: As a result of orthotic fittings, head rotation ability does not (H0), or does (H1) change? Material and Methods: With a digital angle measuring device (HMSU) head and neck rotation can be visualised. The parallel study examines existing data from individuals, collected from 2016 to 2022 with the HMSU, in the context of everyday insole fittings. Compared were barefoot measurement (B) to measurement with fitted insoles (nE) from 1439 persons. Results: The comparison was able to show a strong increase in the degree of head rotation with an average improvement of 44°, thus supporting H1. This also provides strong proove to manipulations, carried out under the feet affect the biomechanics of the vertically running muscle chains, culminating at the head. Diskussion: Possible issius regarding the measurement process and the use of the measuring device are discussed, as well as possible influences that could interfere with the data collection. By transferring this measurement application (HMSU) to other fittings, a better and resource-saving rehabilitation of patients could be achieved.