Ignasiak D, et al. - In adult spinal deformity surgery with long fusion constructs, proximal junctional kyphosis and failure are common complications, so researchers evaluated the biomechanics of the proximal segment for fusions of various lengths. They noted a vital impact of the length of the instrumentation on the proximal segment biomechanics. Findings suggested musculoskeletal modeling to be a promising and adaptable method to support planning of spinal instrumentation surgeries in the future, despite the limits of the current model.