Correlation between neurogenic injury and lumbar disc degeneration in tethered cord syndrome: a retrospective MRI study based on somatosensory evoked potentials. - Liang G; Chang H; Zhu L; Wang Z; Kou J; Ren J; Meng X (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, 2025)