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(A) In the case of L4–5, anterior disc height is the anterior distance between the lower-end L4 plate and upper-end L5 plate (red line). (B) In the case of L4–5, posterior disc height is the posterior distance between the lower-end L4 plate and upper-end L5 plate (red line). (C) In the case of L4–5, foraminal height is the distance between the lower edge of the L4 pedicle and the upper edge of the L5 pedicle (red line).
