Myotonometric examination of longissimus thoracis, multifidus lumborum and rectus abdominis in adolescent idiopathic scoliosis patients and clinical implications regarding load transfer to the pelvic skeleton.

Objective: This study, myotonometric properties of longissimus thoracis, multifidus lumborum, rectus abdominis in adolescent idiopathic scoliosis (AIS) patients were examined according to pelvic axial rotation (PAR) direction and convex/concave side of major curvature. As a result of study, information about biomechanical properties of muscles will be obtained and treatment will be more effective. It is aimed to be contribute to literature. Methods: Individuals between ages of 10-18 were diagnosed with AIS were included in this prospective and descriptive study. Cobb angle and PAR were measured on radiographs. Tone, hardness, elasticity of relevant muscles were measured with MyotonePRO device. Data analysis used with SPSS25 program. Results: A total of 38 patients (male: 11, female: 27) were examined. They were grouped according to PAR direction and the convex/concave side of major curvature, and myotonometric properties of relevant muscles were analyzed. On the concave/convex sides; A moderate positive correlation was found between tone of multifidus lumborum and longissimus thoracis, a strong positive correlation was found between tone of multifidus lumborum and rectus abdominis. A weak positive correlation was found between hardness of multifidus lumborum and longissimus thoracis on convex/concave sides, and moderate positive correlation was found between hardness of multifidus lumborum and rectus abdominis. A weak positive correlation was found between elasticity of multifidus lumborum and rectus abdominis on convex/concave sides. Conclusion: In the tone, stiffness and elasticity of convex/concave side muscles of AIS patients, agonist antagonist muscle influence is more prominent than influence of synergist muscles. This effect should be taken into consideration when planning treatment programs, and it will contribute to shaping of treatment and will contribute to literature since there are not enough studies on this subject. [ABSTRACT FROM AUTHOR]