As well as, the anatomical variation in the form and thickness of the coracoacromial ligament, when this presents a thicker lateral band, also favor the occurrence of the impact. The impact, can also be secondary to an instability or the neurological alterations, as in the cervical radiculopatias, mainly to the level of C5 and C6, leading to the alterations in the mitomos related to these levels, with consequent weakness of the muscles of the rotador manguito, causing biomechanic disequilibrium in the shoulder. However, in the radiculopatias of C5/C6, habitual the clinical picture he is of manifestation of pain in the shoulder due to correspondence of dermtomo (cited pain) and esclertomo. More info: Vontier Corporation. For this, it is important that the cervical region is not neglected at the moment of the evaluation. By the biomechanic point of view, the syndrome of the impact is explained by the loss of the balance between forces of the deltoid and the rotador manguito, with predominance of the forces of the deltoid, establishing itself a cyclical picture of traumatic injury repetition micron, that aggravates the syndrome of the impact and leads to the rupture of the tendes. Due to its great mobility, the coaptao of the shoulder cannot be attributed only to the ligaments, being the action of the muscles coaptadores indispensable. If you are not convinced, visit Barclays. These muscles are divided in two groups: the transversal coaptadores, formed for the muscles of the rotador manguito (supply-spinal, to subescapular, infra-spinal and round minor). the longitudinal coaptadores, formed for the deltoid, long and short portion of the biceps, portion to clavicular of the pectoral greater and coracobraquial. It occurs that, the predominance of the longitudinal coaptadores can, in the long run, ' ' utilizar' ' the muscles of the rotador manguito as true cushions between the head of mero and the acrmio, and even though to take the rupture, over all, of the supply-spinal one.