In an initial clinical examination, the physician can locate the injury using x-rays or computer tomography (CT). While this technology makes the damage to the vertebrae visible, magnetic resonance imaging (MRI) can show the damage to the spinal marrow. The lesion height is defined by the last fully functioning segment of the spinal marrow. Tetraplegia "sub C6", for example, means that the marrow segments C1 to C6 are fully functioning whereas the segment C7 and below are affected.
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