Frantzén A, Saarinen A, Suominen E, Ahonen M, Helenius I. Mechanical axial instability of segmental pedicle screw instrumentation for adolescent idiopathic scoliosis: a retrospective cohort study of tulip screw versus dual locking cup instrumentation. ActaO [Internet]. 2025 Jul. 18 [cited 2026 May 1];96:540–546. Available from: https://actaorthop.org/actao/article/view/44038