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The titanium alloys used in orthopaedic and dental implants are corrosion-resistant and compatible with the human body due to the titanium oxid film which forms spontaneously on the implant surface. However, the utilization of more than one type of alloy or metal on the same patient and the fragility and the thin thickness of the oxid layer, can give rise to the appearance of the corossion phenomena and/or ion release. It is well known that enough concentration of metallic particles are toxic, and are able to produce lnflammation, allergy genetic mutations or carcinogenic processes. With the purpose of minimize the corrossion in the implants and the metallic ion release to the physiological environment it is possible to grow up the titanium oxid layer in a controlled way to have a tough, homogeneous and stable layer with the anodization technique. In this work it is evaluated the improvements in corrosion resistance and the decrease of the metallic ion release due to the anodized layer.

The titanium alloys used in orthopaedic and dental implants are corrosion-resistant and compatible with the human body due to the titanium oxid film which forms spontaneously on the implant surface. However, the utilization of more than one type of alloy or metal on the same patient and the fragility and the thin thickness of the oxid layer, can give rise to the appearance of the corossion phenomena and/or ion release. It is well known that enough concentration of metallic particles are toxic, and are able to produce lnflammation, allergy genetic mutations or carcinogenic processes. With the purpose of minimize the corrossion in the implants and the metallic ion release to the physiological environment it is possible to grow up the titanium oxid layer in a controlled way to have a tough, homogeneous and stable layer with the anodization technique. In this work it is evaluated the improvements in corrosion resistance and the decrease of the metallic ion release due to the anodized layer.

En las graves alteraciones morfo-estructurales de la rodilla, con inestabilidad en varusvalgus, las prótesis vinculadas a bisagra simple, tendían a fallar. El presente trabajo se propone evidenciar que, en tales situaciones, la prótesis vinculada a rotación representa la solución más idónea para el restablecimiento de una nueva normalidad. 18 pacientes (13 mujeres y 5 hombres) con edad media de 68 años han sido sometidos a intervención para colocar prótesis de rodilla. Ha sido utilizado el implante Endo-Model® de Waldemar Link®, prótesis vinculada a rotación. El follow-up medio es de 19 meses con controles a 2, 3, 6 y 12 meses y después anuales. Los resultados han sido: óptimo para 17 pacientes y bueno para 1 paciente, en el cual se ha verificado la ruptura post-operatoria del tendón cuadricipital. Nuestra casuística muestra resultados comparables a los de otros autores. No hemos tenido movilizaciones asépticas o sépticas, ni complicaciones médicas intraoperatorias y post-operatorias. Consideramos que, en presencia de la correcta indicación clínica, la utilización de la prótesis vinculada a rotación es preferible a la de deslizamiento porque disminuye el riesgo de una movilización precoz del implante y del desgaste anormal de los componentes protésicos, restableciendo una nueva normalidad biomecánica.