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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).
Nov 10, 2011. Think about what establishes intrapleural pressure. The lungs want to collapse and the chest cavity wants to expand -> negative pressure between them in intrapleural space. The effect of gravity at the apex can be interpreted as an additional collapsing force on the lungs. Not only do the alveoli want to collapse because of intrinsic properties, gravity is also pushing on alveoli at the apex, resulting in a greater collapsing force and a more negative intrapleural pressure.