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Anterior sacral length (ASL)
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The distance between sacrum promontory and the 5th sacral vertebra anterior-inferior
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Posterior sacral length (PSL)
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The distance between 1st sacral vertebra posterior- superior of the sacrum and the 5th sacral vertebra anterior-inferior
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Anterior sacrococcygeal length (ASCL)
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The distance between the 1st sacral vertebra anterior-superior of the sacrum and the last coccygeal vertebra anterior-inferior
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Posterior sacrococcygeal length (PSCL)
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The distance between the 1st sacral vertebra posterior-superior of the sacrum and the last coccygeal vertebra anterior-inferior
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Anterior sacral curvature length (ASC)
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The curvature length between sacrum promontory and the end of the 5th sacral vertebra
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Posterior sacral curvature length (PSC)
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The curvature length between the sacrum posterior-superior and 5th sacral vertebra posterior-inferior
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Anterior coccygeal curvature length (ACC)
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The curvature length between the coccyx anterior- superior and 5th sacral vertebra anterior-inferior
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Posterior coccygeal curvature length (PCC)
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The curvature length between coccyx posterior- superior and 5th sacral vertebra posterior-inferior
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Sacral area (SA)
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The sacrum area between the beginning of the 1st sacral vertebra and the end of the 5th sacral vertebra
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Coccygeal area (CA)
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The coccyx area between the beginning of the 1st coccygeal vertebra and the end of the last coccygeal vertebra
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