Answer to the letter to the editor of J. Deng, et al. concerning "impact of nonunion on patient-related outcomes after single level minimally invasive transforaminal lumbar interbody fusion for lumbar degenerative disease: a propensity score-matched analysis" by Yamamoto T, et al. (Eur spine J [2025]; doi: 10.1007/s00586-025-09296-9). - Yamamoto T (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)