RESUMO
We describe here the temporomandibular joint and masticatory muscle abnormalities disclosed by computed tomography and magnetic resonance imaging in a 25-year-old man with centronuclear myopathy (a congenital myopathy) who presented with marked limitation of jaw movements. We found an intense and general fatty replacement of the masticatory muscles, and magnetic resonance imaging signals indicated articular fibrosis. We conclude that in centronuclear myopathy, the presence of weakness and hypomotility of the masticatory muscles can induce chronic abnormalities of the temporomandibular joint.
Assuntos
Miopatias Congênitas Estruturais/complicações , Transtornos da Articulação Temporomandibular/etiologia , Transtornos da Articulação Temporomandibular/patologia , Tecido Adiposo , Adulto , Fibrose , Humanos , Imageamento por Ressonância Magnética , Masculino , Músculos da Mastigação/patologia , Amplitude de Movimento Articular , Transtornos da Articulação Temporomandibular/fisiopatologia , Tomografia Computadorizada por Raios XRESUMO
The mechanical stiffness of LIM-41 external fixator assemlages submitted to torsional strain was studied. A condition of unstable fracture was reproduced. The authors evaluated the effect of of Schanz pin configurations, defined as "distal", "standard" and "proximal", and of the distance, 20 mm, 40 mm or 60 mm between the external fixator and the element employed to simulate bone. The authors conclude that stiffer LIM-41 assemblages are obtained if the "standard" or "proximal" configurations are employed, on which some pins are placed near the fracture simulation site, and if the external fixator body is fitted closer to the bone simulating element, having the former variable greater influence over the stiffness coefficient.