Pelvic Asymmetry and Stiffness of the Muscles Stabilizing the Lumbo–Pelvic–Hip Complex (LPHC) in Tensiomyography Examination

<b>Background:</b> The pelvic girdle is an important component of the human stabilization system, both during the maintenance of an upright standing position and during motor activities. Frequent functional and structural asymmetries within it can affect the structure and function of many organs and systems of the human body. The mechanism of their occurrence is not fully explained. The objective of the present study was to verify the hypothesis regarding the relationship between the value of pelvic asymmetry and the functional state of muscles that stabilize the lumbo-pelvic-hip complex, as measured by changes in their stiffness. <b>Methods</b>: The study group consisted of 40 young women aged from 19 to 29 years. The observational cross-sectional study incorporated the following elements: an interview, an anthropometric test, an inclinometric assessment of the magnitude of hip girdle rotation utilizing a duometer and tensiomyography. <b>Results</b>: Analysis of the variables examined in subjects with symmetric or rotated pelvises did not show significant differences between the studied sides in the two groups. Evaluation of associations between the magnitude of pelvic rotation and tensiomyography findings showed that with increased pelvic rotation, the stiffness of the back extensor muscles and the rectus thigh muscles increased only slightly bilaterally, and the contraction rate of the rectus abdominis and biceps thigh muscles decreased. <b>Conclusions</b>: The results of the tensiomyography study did not unequivocally demonstrate that changes in pelvic symmetry in the transverse plane are associated with dysfunction of the muscles that stabilize the pelvic girdle.