Ferguson's Angle is also known as the lumbosacral angle and the sacral base angle. This angle is formed when an oblique line is drawn through and parallel to the sacral base and joined with a line drawn horizontally. This measurement in integral to the assessment of the L5-S1 spinal junction. The average Ferguson's angle is 41 degrees. One standard deviation of plus or minus 7 degrees gives a range of 34 to 48 degrees. An increased angle indicates possible shearing and compressive forces on the lumbar facets and posterior disc causing early degenerative changes. While a decreased angle may affect weight bearing transfer and contribute to early disc and vertebra degeneration.

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