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Association between sagittal alignment and loads at the adjacent segment in the fused spine: a combined clinical and musculoskeletal modeling study of 205 patients with adult spinal deformity
(SPRINGER, 2022-01-01) Ignasiak, Dominika; Behm, Pascal; Mannion, Anne F.; Galbusera, Fabio; Kleinstuck, Frank; Fekete, Tamas F.; Haschtmann, Daniel; Jeszenszky, Dezso; Zimmermann, Laura; Richner-Wunderlin, Sarah; Vila-Casademunt, Alba; Pellise, Ferran; Obeid, Ibrahim; Pizones, Javier; Sanchez Perez-Grueso, Francisco J.; Karaman, Muhammed Ilkay; Alanay, Ahmet; Yilgor, Caglar; Ferguson, Stephen J.; Loibl, Markus
PurposeSagittal malalignment is a risk factor for mechanical complications after surgery for adult spinal deformity (ASD). Spinal loads, modulated by sagittal alignment, may explain this relationship. The aims of this study were to investigate the relationships between: (1) postoperative changes in loads at the proximal segment and realignment, and (2) absolute postoperative loads and postoperative alignment measures. MethodsA previously validated musculoskeletal model of the whole spine was applied to study a clinical sample of 205 patients with ASD. Based on clinical and radiographic data, pre-and postoperative patient-specific alignments were simulated to predict loads at the proximal segment adjacent to the spinal fusion. ResultsWeak-to-moderate associations were found between pre-to-postop changes in lumbar lordosis, LL (r = - 0.23, r = - 0.43