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Anterior column reconstruction (ACR) using a vertebral body replacement device (VBRD). In bisegmental ACR (a), the VBRD is placed bisegmentally between the superior endplate of the caudad intact vertebra and the inferior endplate of the cephalad intact vertebra. In monosegmental ACR (b), the VBDR is placed monosegmentally between the inferior endplate of the fractured vertebra and the inferior endplate of the cephalad intact vertebra
