<prompt> In lower cervical spine injury which level is the commonest level to be involved?C3-C4C4-C5C5-C6C6-C7  <response>: Lower cervical spine injury is the most commonly involved region in the cervical spine. It is most common at C5-C6 level. These injuries may cause severe damage to the cord and consequently paraplegia. Ref: Apleys 9the p.816 