The grip is a spinal injury caused by a blockage of one or more vertebrae that causes significant loss of mobility. Symptoms, well defined, vary as a function of this blockade occurs. The entrapment of a nerve, oppressed by compression, causing pain and immobility where he has his step. The cause of impingement may be inappropriate and awkward postures at work kept overexertion impingement can be lumbar or cervical spine, according to which it occurs. If kept for a long time and cause discomfort, eventually could lead to a herniated disc. Treatment consists in the administration of drugs to relieve pain and physical therapy.