<prompt> The compression fracture is commonest inCervical spineUpper thoracic spineLower thoracic spineLumbosacral region  <response>: C i.e. Lower thoracic spine - Aproximately 90 of all spinal fractures occur in the thoracic and lumbar spines. Infact, the majority of thoracic and lumbar injuries occur with in the region between T11 L1, commonly referred as thoraco- lumbar junction. - Compression wedge fractures involves bucking , or fracture of anterior and middle aspect of veebral body unlike burst , there is no involvement of posterior veebral body. Axial loading with a flexion movement is the mechanism of injury. - Osteoporosis is the most common cause of multiple compression fractures - Compression fractures are most common in thoracolumbar spineQ lower dorsal upper lumbarQ. 