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    "titulo" => "From bone marrow edema to osteonecrosis. New concepts"
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        "resumen" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">The widespread use of MRI in the diagnosis of articular pathology has allowed for an improved knowledge of a series of disturbances that occur with epiphyseal bone edema as a main radiological sign&#44; featured as low signal intensity of the bone marrow on T1 and high signal on STIR and fat saturated T2 sequences&#46; The new etiopathogenic theories postulate a clear differentiation between primary and secondary osteonecrosis&#46; While secondary osteonecrosis is related to risk factors&#44; primary osteonecrosis is a result of a subcondral insufficiency fracture&#46; Both have different characteristic and MRI criteria&#46; The pathogenesis of transient bone edema syndrome &#40;BMES&#41; is currently under discussion&#44; divided between the biomechanic theory and the more classic one that relates to the complex and poorly understood mechanisms associated with complex regional pain syndrome type I &#40;reflex sympathetic dystrophy&#41;&#46; The BMES&#44; classically considered a reversible form of osteonecrosis&#44; has enough differentiated features to be considered as a distinct disease&#46; Bone marrow edema can be as extensive in either insufficiency or fatigue stress fractures than in BMES&#46; The diagnostic key is the display of a subcondral bone fracture&#46; These can be resolved or occasionally evolve into a primary osteonecrosis&#46;</p>"
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        "resumen" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">El uso generalizado de la resonancia magn&#233;tica &#40;RM&#41; en el diagn&#243;stico de la enfermedad articular ha permitido conocer mejor una serie de trastornos que cursan con edema &#243;seo epifisario como signo radiol&#243;gico principal&#44; caracterizado por una hipose&#241;al de la m&#233;dula &#243;sea en secuencias T1 e hiperse&#241;al en STIR o saturaci&#243;n grasa T2&#46; Los nuevos conceptos etiopatog&#233;nicos acerca de la osteonecrosis postulan una clara diferenciaci&#243;n entre osteonecrosis primaria y secundaria&#46; Mientras que la osteonecrosis secundaria se relaciona con factores de riesgo&#44; la osteonecrosis primaria es consecuencia de una fractura subcondral de insuficiencia&#46; Ambas tienen criterios de imagen en RM caracter&#237;sticos y diferentes&#46; La etiopatog&#233;nesis del s&#237;ndrome del edema &#243;seo transitorio &#40;SEOT&#41; se debate actualmente entre la teor&#237;a biomec&#225;nica y la teor&#237;a m&#225;s cl&#225;sica que la relaciona con mecanismos complejos y poco conocidos asociados al s&#237;ndrome de dolor regional complejo tipo I &#40;algodistrofia simp&#225;tica refleja&#41;&#46; El SEOT&#44; cl&#225;sicamente considerado una forma reversible de osteonecrosis&#44; tiene caracter&#237;sticas suficientemente diferenciales como para considerarse una enfermedad con entidad propia y de curso distinto a la osteonecrosis&#46; En las fracturas de estr&#233;s&#44; ya sean de insuficiencia o de sobrecarga&#44; el edema puede ser tan extenso como en el SEOT y la clave diagn&#243;stica es la visualizaci&#243;n de fractura del hueso subcondral&#46; &#201;stas pueden resolverse o evolucionar ocasionalmente hacia una osteonecrosis primaria&#46;</p>"
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From bone marrow edema to osteonecrosis. New concepts
Del edema de médula ósea a la osteonecrosis. Nuevos conceptos
Guillermo Fernández-Cantón
Centro OSATEK, Unidad de Dr. Areilza, Bilbao, País Vasco, Spain
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