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Standard lateral spine radiographs with measurements. (A) TLK and LL. (B) TLK + LL. (C) SVC and HDPAIS. TLK, thoracolumbar kyphosis; LL, lumbar lordosis; TLK + LL, thoracolumbar kyphosis + lumbar lordosis; SVC, single-segment vertebral Cobb angle; HDPAIS, the height difference between the posterior and anterior edges of the intervertebral space.
