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Figure 1 :Entry points for pedicle screw placement in the lumbosacral spine. At the lumbar spine the entry point is in the intersection between a line that passes just laterally to the inferior articular process and a line which bisects the transverse process. An osteotomy (partial facetectomy) of the infero-lateral one-third of the inferior articular process of the superior vertebrae is usually performed. At S1 level, the entry point is at the infero-lateral margin of the basis of the superior articular process of the sacrum

Figure 1 :Entry points for pedicle screw placement in the lumbosacral spine. At the lumbar spine the entry point is in the intersection between a line that passes just laterally to the inferior articular process and
a line which bisects the transverse process. An osteotomy (partial facetectomy) of the infero-lateral one-third of the inferior articular process of the superior vertebrae is usually performed. At S1 level, the entry point is at the infero-lateral margin of the basis of the superior articular process of the sacrum