Erratum to: Eur Spine J (2017) 26:847–856 DOI 10.1007/s00586-016-4885-6

Unfortunately the author name, J. N. Alastair Gibson, was wrongly published in the original version. It has been updated and the complete corrected author group is given below.

J. N. Alastair Gibson, Ashok S. Subramanian, Chloe E. H. Scott