Painful femoro-acetabular impingement symptoms localized in the groin in flexion, adduction and internal rotation can be explained either by a primary disease of the labrum often post-traumatic, and more frequently as part of femoro-acetabular primary or secondary dysmorphia. The kinematic of the normal hip joint depends of peri-acetabular structures, geometry of joints and possible pathologies that could contribute to modify either the geometry or the proprioceptive function. By combining and analyzing these parameters it is possible to describe a joint concept of centricity, an essential parameter for optimal functions of the joint. The concept of overload is explained as the inability of the hip to ensure its centricity during activities that could lead to the occurrence of any degenerative disorders.