Letter to the Editor concerning "Age- and sex-related changes in facet orientation and tropism in lower lumbar spine: an MRI study of 600 patients" by Degulmadi D, et al. (Eur Spine J [2019] 28:961-966, https://doi.org/10.1007/s00586-019-05953-y)
1 Department of Pediatrics, Section of Hematology-Oncology, Baylor College of Medicine, 1102 Bates Avenue, C.1580.44, Houston, TX, 77030, USA. appatel3@texaschildrens.org.