Segmented lordotic angles to assess lumbosacral transitional vertebra on EOS
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ORIGINAL ARTICLE
Segmented lordotic angles to assess lumbosacral transitional vertebra on EOS Domenico Albano1,2 · Carmelo Messina1,3 · Angelo Gambino1 · Martina Gurgitano4 · Carmelo Sciabica2 · Giordano Remo Oliveira Pavan5 · Salvatore Gitto3 · Luca Maria Sconfienza1,3 Received: 22 April 2020 / Revised: 29 June 2020 / Accepted: 4 August 2020 © The Author(s) 2020
Abstract Purpose To test the vertical posterior vertebral angles (VPVA) of the most caudal lumbar segments measured on EOS to identify and classify the lumbosacral transitional vertebra (LSTV). Methods We reviewed the EOS examinations of 906 patients to measure the VPVA at the most caudal lumbar segment (cVPVA) and at the immediately proximal segment (pVPVA), with dVPVA being the result of their difference. Mann–Whitney, Chi-square, and ROC curve statistics were used. Results 172/906 patients (19%) had LSTV (112 females, mean age: 43 ± 21 years), and 89/172 had type I LSTV (52%), 42/172 type II (24%), 33/172 type III (19%), and 8/172 type IV (5%). The cVPVA and dVPVA in non-articulated patients were significantly higher than those of patients with LSTV, patients with only accessory articulations, and patients with only bony fusion (all p
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