Endoprosthesis CORAIL a total hip endoprosthesis which entirely replaces the spherical shape of the hip joint, and therefore consists of four main parts: the bowl, head, neck and body prosthetics. Endoprosthesis CORAIL type MoM are a new type of total hip endoprosthesis whose bearing surfaces of the femur and acetabulum are made of metal, they are developed in order to better mobility, shorter recovery time and durability. Endoprosthesis CORAIL type MoM usually requires revision due to metal-to-metal reactions. Spending prosthesis is produced by movements in the hip joint in which metal debris is created that is released into the bloodstream and surrounding tissue. The previous studies show the harmful effects to the surrounding tissue by mentioned endoprosthesis, but still remains an open question the impact of residual metal fragments in the body after a revision of the eponymous prosthesis. The case series of patients with a endoprosthesis CORAIL type MoM paper aims to show the possible impact of cobalt and chromium in the body after revisions. Based on the available data in the literature about professional exposure to cobalt and chromium goal of the paper is a representation of equivalents health problems in patients with MoM hip replacement. In patients exposed by the action of cobalt and chromium was recorded reduced mobility, the presence of health issues of the cardiovascular, respiratory, nervous and other systems. Besides, in patient is present the uncertainty of the possible future impact of metal in the body. It takes a detailed analysis of all patients with a built endoprosthesis CORAIL type MoM to prevent progression of symptoms caused by the action of cobalt and chromium in the body.