Letter concerning “Segmental pelvic correlation (SPeC): a novel approach to understanding sagittal plane spinal alignment” by Anwar et al.

We would like to compliment Anwar et al. [1] for their excellent article and novel perspective on segmental pelvic correlation (SPeC) in sagittal spinopelvic balance. First, we would like to declare that we agree that correcting the sagittal alignment at each segment is very important to restore individual "spinopelvic harmony." However, we doubt if the pelvic incidence (PI) can predict individual segmental angulation (as the conclusion of the authors), especially when the following deficiencies exist in the patients sample and data processing of their study.

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