Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Recruitment of Knee Flexion to Compensate for Decompen-sated Spinopelvic Sagittal Balance

Version 1 : Received: 24 May 2023 / Approved: 25 May 2023 / Online: 25 May 2023 (10:54:10 CEST)

A peer-reviewed article of this Preprint also exists.

Ouchida, J.; Nakashima, H.; Kanemura, T.; Ito, K.; Tsushima, M.; Machino, M.; Ito, S.; Segi, N.; Ode, Y.; Imagama, S. Differences in Involvement of Whole-Body Compensatory Alignment for Decompensated Spinopelvic Sagittal Balance. J. Clin. Med. 2023, 12, 4690. Ouchida, J.; Nakashima, H.; Kanemura, T.; Ito, K.; Tsushima, M.; Machino, M.; Ito, S.; Segi, N.; Ode, Y.; Imagama, S. Differences in Involvement of Whole-Body Compensatory Alignment for Decompensated Spinopelvic Sagittal Balance. J. Clin. Med. 2023, 12, 4690.

Abstract

Background: The aim of this study was to demonstrate involvement of whole-body compensatory alignment in different conditions of spinopelvic sagittal balance (compensated/decompensated). Methods: We enrolled 330 healthy subjects and divided them according to sagittal vertical axis (SVA): the compensated group, < 4 cm, (group C) and the decompensated group, ≥ 4 cm, (group D). The correlation between lack of ideal lumbar lordosis (iLL), which is calculated by using the Schwab formula, and the compensatory radiographic parameters in each group were analyzed. The threshold value of KF angle that indicates a spinopelvic sagittal imbalance (SVA ≥ 4) was determined by ROC curve analysis. Results: Correlation analysis of lack of iLL and each com-pensatory parameter showed a strong correlation for pelvic tilt (PT) (r = -.723), and a weak cor-relation for thoracic kyphosis (TK) (r = 275) in Group C. In Group D, the correlations were strong for PT (r = -.796), moderate for TK (r = .462), and KF (r = -.415). The optimal cutoff value for KF angle was determined to be 8.4 degrees (sensitivity 89%, specificity 46%). Conclusions: The pre-sent study showed differences between compensated/decompensated spinopelvic sagittal balance in the correlation strength between lack of iLL and whole-body compensatory parameters.

Keywords

sagittal alignment; knee flexion; compensation parameter; spinopelvic sagittal balance; healthy subjects; compensation; Knee-spine syndrome

Subject

Medicine and Pharmacology, Orthopedics and Sports Medicine

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