European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society
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Isolated intraspinal extradural tuberculous granuloma (IETG) without radiological evidence of vertebral involvement is uncommon, especially rare in cervical spine. ⋯ The isolated IETG, although a rare entity, should be considered in the differential diagnosis of the intraspinal mass, especially in patients with spinal cord compression and a history of tuberculosis. If there is a progressing neurological deficit, a combination of surgical and anti-tuberculous treatment should be the optimal choice.
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A 47-year-old male with a history of recurrent low-back pain presented with acute left radiculopathy. ⋯ Intradural disc herniation is a rare condition and requires durotomy to remove the pathology. Therefore an actual high resolution MRI is mandatory in all cases of intraspinal space occupying lesions.
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The indications for magnetic resonance imaging in presumed adolescent idiopathic scoliosis (AIS) have not been established, with some studies suggesting that rates of spinal cord abnormalities are low and question the use of the routine MRI in AIS. ⋯ Our audit demonstrates that neither coronal nor sagittal misbalance should be used as an indicator of neural axis abnormalities.
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Pre-clinical wear testing of intervertebral disc prostheses is commonly carried out according to ISO 18192-1. Ten million multiaxial loading cycles are applied at a frequency of 1 Hz. At this frequency, testing takes about 4 months. ⋯ However, a loading frequency of 1 Hz is probably closer to physiology than 2 Hz since the loading amplitudes prescribed by ISO 18192-1 are high. They rather represent movements like tying shoes or standing up from a chair than walking or sitting. The authors therefore suggest testing at 1 Hz.