Infiltração gordurosa nos mm. multífidus e psoas maior em função do tipo de alteração discal em pacientes com lombalgia: um estudo através de imagens de ressonância magnética / Fat infiltration in multifidi and psoas major muscles according to disc pathology in low back pain patients: a magnetic resonance imaging study

A hipotrofia dos músculos que estabilizam a coluna é encontrada com freqüência nos pacientes com lombalgia. Contudo, não há estudos que tenham investigado se esta perda muscular é influenciada pela etiopatogenia da lombalgia. Na tentativa de analisar esta questão, o presente estudo avaliou, por meio de imagens de ressonância magnética, a porcentagem de infiltrado gorduroso nos mm. multifidus e psoas maior em pacientes com diferentes alterações discais. Os resultados desta análise indicam que nos níveis com abaulamento os músculos estudados apresentam em média 6 por cento a mais de gordura do que nos níveis com protrusão. Esta diferença foi significante e deve ser levada em consideração na reabilitação dos pacientes com dor lombar.Atrofia of muscles related to spine stabilization is a well known feature of low back pain patients. However, it remains unknown if this atrofia is influenced by the etiopathology of low back pain. The aim of this study was to analyse if the atrofia of multifidi and Psoas Major muscles is related to the type of disc alteration. To this effect, the present study analysed MRI scans of patients with low back pain and measured the fat percentage in multifidi and Psoas Major cross sectional areas. The results indicated that levels with disc bulge presented 6 per cent more fat deposits than levels with disc protrusion. This difference was statistically significant and should be taken into account in low back pain rehabilitation...

Estudo eletromiográfico dos Mm. multífidos na coluna lombar e torácica durante a fase de apoio da marcha / Electromyographic study of the multifidus in the lumbar and thoracic spine during the stance phase

The airn of this study was to analyze multifidus muscles, since they are related to several disorders of the spine. The electromyographic study reveals that multifidus muscles in the lumbar and thoracic spine present a simultaneous activity on the right and left sides of the spine during the stance phase. Nevertheless, the coefficient of variation shows that less variation occurs in the lumbar muscles ipsilateral to the lower limb of the stance, and in the thoracic muscles contralateral to the stance limb. Our results suggest that multifidus muscles play a stabilizing role and are also related to spine rotation.