caa a22 4500 445832967 CHVBK 20180317145321.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s00586-011-1908-1 doi (NATIONALLICENCE)springer-10.1007/s00586-011-1908-1 Inter- and intraobserver reliability assessment of computed tomographic 3D measurement of pedicles in scoliosis and size matching with pedicle screws [Elektronische Daten] [Michaela Gstoettner, Ricarda Lechner, Bernhard Glodny, Martin Thaler, Christian Bach] Background: In patients with scoliosis, the morphology of the pedicles differs from those in normal spines. Preoperative three-dimensional information of these complex anatomic situations means a great advantage for the surgeon in order to assess which pedicles can be instrumented safely avoiding screw misplacement and for the decisions in choosing the appropriate screw size. The objective of this study was to measure pedicle dimensions in scoliotic spines on three-dimensional computed tomographic (CT) scans and to determine the intra- and interobserver reliability of the method. Additionally, the pedicles that cannot be instrumented safely by available screws were identified. Methods: All pedicles from T1 to L5 in 30 patients with scoliosis were measured by two independent observers. The pedicle width, height and length were assessed for two times with a 3-week interval. Intraclass correlation coefficients were used to determine the intra- and interobserver reliabilities. The diameters of the pedicles were matched with the dimensions of the smallest available pedicle screws of scoliosis implant systems. Results: The intrarater reliability was strong in 60% of the parameters and moderate in 40%. The interrater reliability was strong in all parameters but in pedicle length. The concave-sided pedicles in the curve revealed to be smaller compared to the convex-sided ones. The highest percentage of size mismatch was found in levels T7 (31%) and T8 (33%). Conclusions: Measurement of pedicle dimensions on three-dimensional CT scans is a reliable but time-consuming procedure to assess pedicle dimensions. CT measuring should be reserved for special cases, where the anatomic situation remains unclear despite X-ray. In scoliotic spines, one-third of the mid-thoracic pedicles cannot be instrumented safely with pedicle screws. Springer-Verlag, 2011 Intraobserver reliability nationallicence Interobserver reliability nationallicence Scoliosis nationallicence Pedicle morphology nationallicence Three-dimensional CT nationallicence Gstoettner Michaela Department of Orthopaedic Surgery, Medical University Innsbruck, Anichstr 35, 6020, Innsbruck, Austria aut Lechner Ricarda Department of Orthopaedic Surgery, Medical University Innsbruck, Anichstr 35, 6020, Innsbruck, Austria aut Glodny Bernhard Department of Radiology, Medical University Innsbruck, Anichstr 35, 6020, Innsbruck, Austria aut Thaler Martin Department of Orthopaedic Surgery, Medical University Innsbruck, Anichstr 35, 6020, Innsbruck, Austria aut Bach Christian Department of Orthopaedic Surgery, Medical University Innsbruck, Anichstr 35, 6020, Innsbruck, Austria aut European Spine Journal Springer-Verlag 20/10(2011-10-01), 1771-1779 0940-6719 20:10<1771 2011 20 586 https://doi.org/10.1007/s00586-011-1908-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00586-011-1908-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gstoettner Michaela Department of Orthopaedic Surgery, Medical University Innsbruck, Anichstr 35, 6020, Innsbruck, Austria aut NATIONALLICENCE 700 1- Lechner Ricarda Department of Orthopaedic Surgery, Medical University Innsbruck, Anichstr 35, 6020, Innsbruck, Austria aut NATIONALLICENCE 700 1- Glodny Bernhard Department of Radiology, Medical University Innsbruck, Anichstr 35, 6020, Innsbruck, Austria aut NATIONALLICENCE 700 1- Thaler Martin Department of Orthopaedic Surgery, Medical University Innsbruck, Anichstr 35, 6020, Innsbruck, Austria aut NATIONALLICENCE 700 1- Bach Christian Department of Orthopaedic Surgery, Medical University Innsbruck, Anichstr 35, 6020, Innsbruck, Austria aut NATIONALLICENCE 773 0- European Spine Journal Springer-Verlag 20/10(2011-10-01), 1771-1779 0940-6719 20:10<1771 2011 20 586 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer