Biomechanics considerations in the treatment of double traumatic non-contiguous subaxial cervical lesions.

Double traumatic non-contiguous lesions of the subaxial cervical region are a rare event mostly caused by multiple, simultaneous or rapidly consecutive high-energy-impact traumas. The modality of treatment chosen for these lesions must be related to local lower cervical spine biomechanics. We present the case of a 59 year-old patient who suffered a subaxial cervical spine double fracture-dislocation following a complex-dynamic trauma. Radiological imaging displayed a C4-C5 and C7-T1 fracture-dislocation with cord signal intensity abnormalities. This patient showed a complete neurological deficit (ASIA A; mJOA 0) with a C4 sensory-motor level. He was urgently operated upon through an anterior approach, reduction of both dislocations and positioning of intervertebral cages and anterior plates at C4-C5 and C7-T1. At a 16-month follow-up he displays neurological improvement, moving his upper extremities at the C7-C8 motor level and a T5 sensory level (mJOA 3; Odom's Criteria 3). The check-CT scan at 24-month shows the correct positioning of the stabilization system and a complete bone fusion.Double traumatic lesions of the subaxial cervical spine, when interposed by healthy functional segments can be treated as two single independent lesions in order to allow a better outcome.