caa a22 4500 445831243 CHVBK 20180317145315.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s00586-010-1558-8 doi (NATIONALLICENCE)springer-10.1007/s00586-010-1558-8 The relationship between degree of facet tropism and amount of dynamic disc bulge in lumbar spine of patients symptomatic for low back pain [Elektronische Daten] [Duc Do, Cyrus Taghavi, Winston Fong, Min Kong, Yuichiro Morishita, Jeffrey Wang] Facet tropism has been investigated as a predisposing factor for degenerative changes in the lumbar spine; however, no prior study has evaluated the relationship between disc bulge and facet tropism. In this study, we used kinetic magnetic resonance imaging (kMRI) to investigate the association between degree of facet tropism and amount of disc bulge in the lumbar spine in relation to age. kMRIs in the flexion, neutral, and extension positions were performed on 410 consecutive patients with low back pain. T2-weighted midsagittal and axial mid-disc cuts were analyzed to measure disc bulge and facet angle. Facet asymmetry was calculated and classified as: no facet tropism, <6°; mild facet tropism, 6-11°; or severe facet tropism, ≥11°. Maximal static bulge (MSB), maximal dynamic bulge (MDB), and age in the facet tropism groups were compared by age subpopulations and MDB categories, defined by the positions between which the largest change in disc bulge occurs. We found the severe facet tropism group to be associated with a nearly significant increase in MSB and MDB over the no facet tropism group in the older subpopulation at the L4-L5 level only, and a larger MDB in the L4-L5 MDB category [E-N], where the greatest change in disc bulge occurs between neutral and extension positions (p=0.013). Our findings suggest that severe facet tropism is associated with increased disc bulge at L4-L5 in only a subset of older age patients, but may in large part be due to biomechanical factors that define the [E-N] category. The Author(s), 2010 Facet tropism nationallicence Lumbar disc herniation nationallicence Disc bulge nationallicence Kinetic magnetic resonance imaging nationallicence Disk degeneration nationallicence Do Duc Department of Orthopaedic Surgery, David Geffen School of Medicine at UCLA, 90095, Los Angeles, CA, USA aut Taghavi Cyrus Department of Orthopaedic Surgery, David Geffen School of Medicine at UCLA, 90095, Los Angeles, CA, USA aut Fong Winston Department of Orthopaedic Surgery, David Geffen School of Medicine at UCLA, 90095, Los Angeles, CA, USA aut Kong Min Department of Orthopaedic Surgery, David Geffen School of Medicine at UCLA, 90095, Los Angeles, CA, USA aut Morishita Yuichiro Department of Orthopaedic Surgery, David Geffen School of Medicine at UCLA, 90095, Los Angeles, CA, USA aut Wang Jeffrey Department of Orthopaedic Surgery, David Geffen School of Medicine at UCLA, 90095, Los Angeles, CA, USA aut European Spine Journal Springer-Verlag 20/1(2011-01-01), 71-78 0940-6719 20:1<71 2011 20 586 https://doi.org/10.1007/s00586-010-1558-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00586-010-1558-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Do Duc Department of Orthopaedic Surgery, David Geffen School of Medicine at UCLA, 90095, Los Angeles, CA, USA aut NATIONALLICENCE 700 1- Taghavi Cyrus Department of Orthopaedic Surgery, David Geffen School of Medicine at UCLA, 90095, Los Angeles, CA, USA aut NATIONALLICENCE 700 1- Fong Winston Department of Orthopaedic Surgery, David Geffen School of Medicine at UCLA, 90095, Los Angeles, CA, USA aut NATIONALLICENCE 700 1- Kong Min Department of Orthopaedic Surgery, David Geffen School of Medicine at UCLA, 90095, Los Angeles, CA, USA aut NATIONALLICENCE 700 1- Morishita Yuichiro Department of Orthopaedic Surgery, David Geffen School of Medicine at UCLA, 90095, Los Angeles, CA, USA aut NATIONALLICENCE 700 1- Wang Jeffrey Department of Orthopaedic Surgery, David Geffen School of Medicine at UCLA, 90095, Los Angeles, CA, USA aut NATIONALLICENCE 773 0- European Spine Journal Springer-Verlag 20/1(2011-01-01), 71-78 0940-6719 20:1<71 2011 20 586 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer