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Compression fractures of the spine usually occur at the bottom part of the thoracic spine (T11 and T12) and the first vertebra of the lumbar spine (L1).Compression fractures of the spine generally occur from too much pressure on the vertebral body.ompression fractures of the spine usually occur at the bottom part of the thoracic spine (T11 and T12) and the first vertebra of the lumbar spine (L1).
Compression. 1  At the microscopic level the failure mechanism for bone tissue in compression is mainly oblique cracking of the osteons. 2  The type of fracture that occurs in compression is an oblique fracture at an angle of 30 degrees as shear forces at this angle are responsible for the failure.