caa a22 4500 445834536 CHVBK 20180317145326.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s00586-011-1926-z doi (NATIONALLICENCE)springer-10.1007/s00586-011-1926-z Lumbo-pelvic lordosis and the pelvic radius technique in the assessment of spinal sagittal balance: strengths and caveats [Elektronische Daten] [I. Sergides, Peter McCombe, G. White, Sabarul Mokhtar, William Sears] Introduction: The two main methodologies described for the assessment of spinal sagittal alignment are the pelvic radius (PR) technique and that based on measures of the Pelvic Incidence (PI) and Spino-Sacral Angle (SSA). Both methods stress the fundamental relationship between the anatomical position and orientation of the sacrum within the pelvis and the spinal curves above. The aim of the current study was to assess the strengths and potential weaknesses of the PR technique. The PR technique uses measures based on a line (the PR), drawn between the hip axis and the posterior corner of the S1 endplate. The angle formed between the PR line and the sacral endplate, PRS1, is a developmental measure of sacropelvic morphology. Geometrically, PI and PRS1 are approximately complementary angles and both reflect reciprocal alterations in pelvic tilt (for PI) or angulation (for PRS1) and the slope of the S1 endplate. The angle formed between PR and T12, the PR-T12, reflects a combined measure of pelvic morphology and lumbar lordosis. It appears to be a useful measure, which provides a simple and rapid assessment of lumbopelvic sagittal balance, but only in the presence of a congruent thoracic curvature. Materials and methods: After reviewing the literature, published measures made using the PR technique were compared to measures taken from a substantial patient population (479 adult patients). Conclusions: Errors can occur using the PR technique if the PRT12 is viewed in isolation from the thoracic kyphosis. We found the ratio of the thoracic kyphosis to lumbar lordosis (T4-T12/T12-S1) to be a useful predictor of congruent sagittal alignment, which may alert the clinician to situations where use of the PR-T12 in isolation may be misleading. Springer-Verlag, 2011 Spine nationallicence Sagittal balance nationallicence Pelvic radius nationallicence Sergides I. Royal North Shore Hospital, Sydney, Australia aut McCombe Peter Royal Brisbane Hospital, Brisbane, Australia aut White G. Sydney NeuroSpine Clinic, Sydney, Australia aut Mokhtar Sabarul Australian School of Advanced Medicine, Macquarie University, Sydney, Australia aut Sears William Royal North Shore Hospital, Sydney, Australia aut European Spine Journal Springer-Verlag 20(2011-09-01), 591-601 0940-6719 20<591 2011 20 586 https://doi.org/10.1007/s00586-011-1926-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00586-011-1926-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sergides I. Royal North Shore Hospital, Sydney, Australia aut NATIONALLICENCE 700 1- McCombe Peter Royal Brisbane Hospital, Brisbane, Australia aut NATIONALLICENCE 700 1- White G. Sydney NeuroSpine Clinic, Sydney, Australia aut NATIONALLICENCE 700 1- Mokhtar Sabarul Australian School of Advanced Medicine, Macquarie University, Sydney, Australia aut NATIONALLICENCE 700 1- Sears William Royal North Shore Hospital, Sydney, Australia aut NATIONALLICENCE 773 0- European Spine Journal Springer-Verlag 20(2011-09-01), 591-601 0940-6719 20<591 2011 20 586 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer