[Resumen] La reciente modificación de la Constitución española de 1978 se analizará conforme el significado, funciones y alcance del instituto de la reforma constitucional en la Teoría Constitucional. Desde esta perspectiva se observa que esta reforma de la Constitución, tras mantenerse prácticamente inalterada más de treinta años, precisa por su origen, tramitación, contenido y consecuencias, un estudio profundo para aprehender su significado e implicaciones. En especial si el poder de reforma, institución garante de la supremacía constitucional y del principio legitimador democrático subyacente de la soberanía popular, ha cumplido estos cometidos: la estabilidad constitucional mediante su adecuación a la realidad actual caracterizada por la crisis económica y las exigencias monetarias y fiscales de la Unión Europea.[Abstract] The recent amendment to the 1978 Spanish Constitution has to be analized regarding the meaning, functions and scope that present the Institute for constitutional reform in the Theory of the Constitution. From this perspective we see that the 2011 constitutional reform after remaining virtually unchanged for over thirty years, both by its origin and its processing, content and consequences, require a critically study enabling understanding true meaning of the change and its implications. In particular, it is about whether the ability to reform understood as the institution conceived as basic constitutional guarantee of supremacy, and thus, the basic legal principle of sovereignty has really served to defend the supremacy of the Constitution of 1978 combining the stability and permanence with its adaptation to the reality marked by fiscal and monetary requirements of the European Union and the economic crisis
