Resumo O objetivo deste trabalho é relatar um caso com os achados de imagem característicos da lesão traumática do manguito rotador com interposição de múltiplos cotos de tendões do manguito rotador entre a glenoide e o úmero, confirmada cirurgicamente. Esta condição é uma rara complicação do trauma do ombro. Em geral ocorre no trauma de alta energia, frequentemente associada com luxação da articulação glenoumeral. No caso em questão não houve documentação de luxação franca da articulação glenoumeral. As radiografias mostraram aumento do espaço articular, rotação interna do úmero e fratura do coracoide. Nas imagens de ressonância magnética, além das alterações observadas nas radiografias, foi identificada ruptura massiva do manguito rotador com interposição dos cotos dos tendões do supraespinal, do infraespinal e do subescapular no interior da articulação glenoumeral. Foi realizado tratamento cirúrgico confirmando a lesão e a interposição dos cotos do manguito. É importante que radiologistas e ortopedistas estejam familiarizados com esta entidade, que, pela sua raridade, pode ser negligenciada no atendimento do trauma do ombro.

Abstract The present report describes a case where typical findings of traumatic glenohumeral interposition of rotator cuff stumps were surgically confirmed. This condition is a rare complication of shoulder trauma. Generally, it occurs in high-energy trauma, frequently in association with glenohumeral joint dislocation. Radiography demonstrated increased joint space, internal rotation of the humerus and coracoid process fracture. In addition to the mentioned findings, magnetic resonance imaging showed massive rotator cuff tear with interposition of the supraspinatus, infraspinatus and subscapularis stumps within the glenohumeral joint. Surgical treatment was performed confirming the injury and the rotator cuff stumps interposition. It is important that radiologists and orthopedic surgeons become familiar with this entity which, because of its rarity, might be neglected in cases of shoulder trauma.

OBJECTIVE: To evaluate the intraobserver and interobserver reliability of radial torsion angle measurement using computed tomography. METHODS: Twelve pairs of cadaver radii and 116 forearms from 58 healthy volunteers were evaluated using axial computed tomography sections measured at the level of the bicipital tuberosity and the subchondral region of the radius. During digital imaging, the angle was formed by two lines, one diametrically perpendicular to the radial tubercle and the other tangential to the volar rim of the distal joint surface. Measurements were performed twice each by three observers. RESULTS: In cadaveric bones, the mean radial torsion angle was 1.48º (-6º - 9º) on the right and 1.62º (-6 º - 8º) on the left, with a mean difference between the right and left sides of 1.61º (0º - 8º). In volunteers, the mean radial torsion angle was 3.00° (-17° - 17°) on the right and 2.91° (-16°- 15°) on the left, with a mean difference between the sides of 1.58º (0º - 7º). There was no significant difference between each side. The interobserver correlation coefficient for the cadaver radii measurements was 0.88 (0.72 - 0.96) and 0.81 (0.58 - 0.93) for the right and left radius, respectively, while for the volunteers, the difference was 0.84 (0.77 - 0.90) and 0.83 (0.75 - 0.89), respectively. Intraobserver reliability was high. CONCLUSION: The described method is reproducible and applicable even when the radial tubercle has a rounded contour.