Dorsal spinal instrumentation in multiple myeloma: postoperative acute kidney injury is associated with mortality, morbidity, and deterioration of bone and muscle status. - Kylies J; Leonhardt LG; Brauneck E; Kylies D; Bay A; Schroeder M; Schomacher M; Dreimann M; Obid P; Weisel K; Viezens L (European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society, 2026)