Caracterización de componentes modulares en implantes de cadera retirados anticipadamente de pacientes en las diferentes clínicas en la ciudad de Barranquilla.

Many problems caused by loosening, fracture dislocation and hip modular system are due to wear, incompatibility with the environment, cytotoxicity and corrosion of materials used for joint replacement. The previous limitations usually induce the formation of hazardous wastes, causing serious injury to bone tissue, directly affecting patient health and reducing the life of the implant, leading to the risk of further surgery, for early withdrawal of the prosthesis. The aim of this study was characterize the materials of modular hip implants to determine possible causes of early retirement, in samples from different clinics in the city of Barranquilla. The materials found in different modular pairs removed were polymer-ceramic and polymer-metal type, such as PMMA, UHMWPE, Ti6Al4V and Co-Cr-Mo. The characterization was developed from medical diagnosis in order to analyze the possible causes and conditions with greater impact, causing the early retirement of hip implants. The samples were characterized by X-Ray Diffraction, Optical Microscopy and Scanning Electron Microscopy. In the case of polymeric component, this was characterized by TGA. The results showed topographical similarities between modular pairs polymer-metal type. The presence of microcracks shows additional embrittlement in the structure of the implant due to environment. The other hand the polymeric component showed cracks and scratchs due to third body wear in the bearing zone and significant evidence of fracture in the femoral component. In the acetabular component were observed different patterns of adhesive and corrosive wear. [ABSTRACT FROM AUTHOR]