Fig. 3. Three-dimensional cursor tool for the apex of glenoid (arrows). First, in panel A, click on the apex of glenoid in axial plane. Panel B, C are the same level cut in coronal and sagittal plane.
Fig. 4. Glenoid anterior surface angle. The angle between the glenoid axis and the glenoid anterior surface line, at which the anterior area and the posterior area are similar, was measured.
Fig. 1. Measurement of glenoid. A: glenoid height, B: glenoid width, C: glenoid apex range, D: glenoid anterior surface angle.
Fig. 2. The point of where anterior area and posterior area, along the glenoid axis, are similar on the axial plane (asterisks).
Fig. 5. (A) The anterior surface line (dotted line) of glenoid body and glenoid neck is not linear. (B) The point of where the anterior area and the posterior area along the glenoid axis are similar (asterisk). (C) The posterior surface line (dotted line) of glenoid body and glenoid neck is not linear. The anterior area and the posterior area along the glenoid axis are similar. The point where the anterior surface line and the posterior surface line meet was measured in this study. (D) The location from the glenoid upper margin to the point where the anterior surface line and the posterior surface line meet was divided by the total length of the glenoid height to calculate the percent ratio.
Fig. 6. The location of glenoid apex (L) is 60.36%, the range of glenoid apex (R) is 21.16% (circle).
Table 1. Demographic
Table 2. Result of Glenoid Measurements (Sex)
Table 3. Result of Glenoid Measurements (Age)
Table 4. Statistical Analysis of Glenoid Apex (Pearson Correlation Coefficient)
References
- Hart ND, Clark JC, Wade Krause FR, Kissenberth MJ, Bragg WE, Hawkins RJ. Glenoid screw position in the Encore Reverse Shoulder Prosthesis: an anatomic dissection study of screw relationship to surrounding structures. J Shoulder Elbow Surg. 2013;22(6):814-20. https://doi.org/10.1016/j.jse.2012.08.013
- Nyffeler RW, Werner CM, Gerber C. Biomechanical relevance of glenoid component positioning in the reverse Delta III total shoulder prosthesis. J Shoulder Elbow Surg. 2005;14(5):524-8. https://doi.org/10.1016/j.jse.2004.09.010
- Stephens BF, Hebert CT, Azar FM, Mihalko WM, Throckmorton TW. Optimal baseplate rotational alignment for lockingscrew fixation in reverse total shoulder arthroplasty: a threedimensional computer-aided design study. J Shoulder Elbow Surg. 2015;24(9):1367-71. https://doi.org/10.1016/j.jse.2015.01.012
- Parsons BO, Gruson KI, Accousti KJ, Klug RA, Flatow EL. Optimal rotation and screw positioning for initial glenosphere baseplate fixation in reverse shoulder arthroplasty. J Shoulder Elbow Surg. 2009;18(6):886-91. https://doi.org/10.1016/j.jse.2008.11.002
- DiStefano JG, Park AY, Nguyen TQ, Diederichs G, Buckley JM, Montgomery WH 3rd. Optimal screw placement for base plate fixation in reverse total shoulder arthroplasty. J Shoulder Elbow Surg. 2011;20(3):467-76. https://doi.org/10.1016/j.jse.2010.06.001
- Kelly JD 2nd, Humphrey CS, Norris TR. Optimizing glenosphere position and fixation in reverse shoulder arthroplasty, part one: the twelve-mm rule. J Shoulder Elbow Surg. 2008; 17(4):589-94. https://doi.org/10.1016/j.jse.2007.08.013
- Theopold J, Pieroh P, Scharge ML, et al. Improved accuracy of K-wire positioning into the glenoid vault by intraoperative 3D image intensifier-based navigation for the glenoid component in shoulder arthroplasty. Orthop Traumatol Surg Res. 2016; 102(5):575-81. https://doi.org/10.1016/j.otsr.2016.03.013
- Humphrey CS, Kelly JD 2nd, Norris TR. Optimizing glenosphere position and fixation in reverse shoulder arthroplasty, part two: the three-column concept. J Shoulder Elbow Surg. 2008;17(4):595-601. https://doi.org/10.1016/j.jse.2008.05.038
- Codsi MJ, Iannotti JP. The effect of screw position on the initial fixation of a reverse total shoulder prosthesis in a glenoid with a cavitary bone defect. J Shoulder Elbow Surg. 2008;17(3): 479-86. https://doi.org/10.1016/j.jse.2007.09.002
- Matsen FA 3rd, Boileau P, Walch G, Gerber C, Bicknell RT. The reverse total shoulder arthroplasty. J Bone Joint Surg Am. 2007;89(3):660-7.
- Verborgt O, De Smedt T, Vanhees M, Clockaerts S, Parizel PM, Van Glabbeek F. Accuracy of placement of the glenoid component in reversed shoulder arthroplasty with and without navigation. J Shoulder Elbow Surg. 2011;20(1):21-6. https://doi.org/10.1016/j.jse.2010.07.014
- Lewis GS, Bryce CD, Davison AC, Hollenbeak CS, Piazza SJ, Armstrong AD. Location of the optimized centerline of the glenoid vault: a comparison of two operative techniques with use of three-dimensional computer modeling. J Bone Joint Surg Am. 2010;92(5):1188-94. https://doi.org/10.2106/JBJS.I.00131
- Nguyen D, Ferreira LM, Brownhill JR, et al. Improved accuracy of computer assisted glenoid implantation in total shoulder arthroplasty: an in-vitro randomized controlled trial. J Shoulder Elbow Surg. 2009;18(6):907-14. https://doi.org/10.1016/j.jse.2009.02.022
- Mulligan RP, Azar FM, Throckmorton TW. Is a generic targeting guide useful for glenoid component placement in shoulder arthroplasty? J Shoulder Elbow Surg. 2016;25(4):e90-5. https://doi.org/10.1016/j.jse.2015.08.040
- Verborgt O, Vanhees M, Heylen S, Hardy P, Declercq G, Bicknell R. Computer navigation and patient-specific instrumentation in shoulder arthroplasty. Sports Med Arthrosc Rev. 2014;22(4):e42-9. https://doi.org/10.1097/JSA.0000000000000045
- Walch G, Vezeridis PS, Boileau P, Deransart P, Chaoui J. Threedimensional planning and use of patient-specific guides improve glenoid component position: an in vitro study. J Shoulder Elbow Surg. 2015;24(2):302-9. https://doi.org/10.1016/j.jse.2014.05.029
- von Schroeder HP, Kuiper SD, Botte MJ. Osseous anatomy of the scapula. Clin Orthop Relat Res. 2001;(383):131-9.
- Ebraheim NA, Xu R, Haman SP, Miedler JD, Yeasting RA. Quantitative anatomy of the scapula. Am J Orthop (Belle Mead NJ). 2000;29(4):287-92.
- Pinkas D, Wiater B, Wiater JM. The glenoid component in anatomic shoulder arthroplasty. J Am Acad Orthop Surg. 2015; 23(5):317-26. https://doi.org/10.5435/JAAOS-D-13-00208
- Checroun AJ, Hawkins C, Kummer FJ, Zuckerman JD. Fit of current glenoid component designs: an anatomic cadaver study. J Shoulder Elbow Surg. 2002;11(6):614-7. https://doi.org/10.1067/mse.2002.126099
- Cabezas AF, Krebes K, Hussey MM, et al. Morphologic variability of the shoulder between the populations of North American and East Asian. Clin Orthop Surg. 2016;8(3):280-7. https://doi.org/10.4055/cios.2016.8.3.280
- Gonzalez JF, Alami GB, Baque F, Walch G, Boileau P. Complications of unconstrained shoulder prostheses. J Shoulder Elbow Surg. 2011;20(4):666-82. https://doi.org/10.1016/j.jse.2010.11.017
- Harman M, Frankle M, Vasey M, Banks S. Initial glenoid component fixation in "reverse" total shoulder arthroplasty: a biomechanical evaluation. J Shoulder Elbow Surg. 2005;14(1 Suppl S):162S-7S. https://doi.org/10.1016/j.jse.2004.09.030
- Kircher J, Wiedemann M, Magosch P, Lichtenberg S, Habermeyer P. Improved accuracy of glenoid positioning in total shoulder arthroplasty with intraoperative navigation: a prospective-randomized clinical study. J Shoulder Elbow Surg. 2009;18(4):515-20. https://doi.org/10.1016/j.jse.2009.03.014