Answer to the letter to the editor of Y. Wang, et al. concerning "Is ABO blood type a risk factor for adjacent segment degeneration after lumbar spine fusion?" by S.S. Rudisill, et al. (Eur Spine J [2024]: doi 10.1007/s00586-024-08516-y). - Rudisill SS; Massel DH; Hornung AL; Kia C; Patel K; Aboushaala K; Chukwuemeka M; Wong AYL; Barajas JN; Mallow GM; Toro SJ; Singh H; et al. (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)