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Influence of radiographic viewing perspective on the Reverse Shoulder Arthroplasty (RSA) angle

Henninger, Heath; Percin, Brittany

Publisher
Zenodo
DOI
10.5281/zenodo.17592322
Repository
zenodo.org
Language
en

Abstract

This data quantifies the Reverse Shoulder Arthroplasty (RSA) Angle on digitally reconstructed radiographs (DRRs) that were generated from computed tomography (CT) scans of cadaveric scapulae. The RSA Angle was first described by Boileau in 2019 (https://pubmed.ncbi.nlm.nih.gov/30935825/). To measure the RSA Angle, the floor of the supraspinatus fossa provides the horizontal reference axis, R is the point of intersection of this line and the glenoid, S is the most inferior point on the glenoid rim, and A is the point creating a line perpendicular to the floor of the fossa passing through S. The angle between points R, S and A is the RSA angle. When viewed as a true anterior-posterior (AP) radiograph only one RSA angle is calculated since the glenoid is viewed in profile, but when the viewing perspective is altered the glenoid face is visible to varying degrees. Thus, the RSA angle could be calculated at multiple locations of intersection, notably the medial rim of the glenoid (red), lateral rim of the glenoid (green), or glenoid midline (blue). This study quantified the effect of viewing perspective on perceived measures of the RSA Angle in 2D, as well as on 3D models of the respective scapulae to determine the relationship between 2D and 3D RSA angles. Note that most of the 3D models used in the present analysis can be found in a prior data release on Zenodo.org (https://doi.org/10.5281/zenodo.14590062). A key linking the present specimen IDs to those in the prior release can be found in Appendix1_RSA_angles_EXPANDED.xlsx, Sheet ‘2D vs. 3D’, column M. Those models missing from the prior release (i.e., listed as ‘NA’ in Appendix1) are provided here using the naming convention consistent with the present release.

Full text

Page 1 of 3 ArƟcle Title: Influence of radiographic viewing perspecƟve on the Reverse Shoulder Arthroplasty (RSA) angle CitaƟon: Seminars in Arthroplasty: JSES (hps://doi.org/10.1053/j.sart.2025.09.006) Zenodo DOI: 10.5281/zenodo.17592321 Henninger Lab, Harold K. Dunn Orthopaedic Research Laboratory University of Utah, Salt Lake City, UT hƩps://medicine.utah.edu/orthopaedics/research/labs/harold-dunn/groups/henninger This data quanfies the Reverse Shoulder Arthroplasty (RSA) Angle on digitally reconstructed radiographs (DRRs) that were generated from computed tomography (CT) scans of cadaveric scapulae. The RSA Angle was first described by Boileau in 2019 (hps://pubmed.ncbi.nlm.nih.gov/30935825/). To measure the RSA Angle, the floor of the supraspinatus fossa provides the horizontal reference axis, R is the point of intersecon of this line and the glenoid, S is the most inferior point on the glenoid rim, and A is the point creang a line perpendicular to the floor of the fossa passing through S. The angle between points R, S and A is the RSA angle. When viewed as a true anterior-posterior (AP) radiograph only one RSA angle is calculated since the glenoid is viewed in profile, but when the viewing perspecve is altered the glenoid face is visible to varying degrees. Thus, the RSA angle could be calculated at mulple locaons of intersecon, notably the medial rim of the glenoid (red), lateral rim of the glenoid (green), or glenoid midline (blue). This study quanfied the effect of viewing perspecve on perceived measures of the RSA Angle in 2D, as well as on 3D models of the respecve scapulae to determine the relaonship between 2D and 3D RSA angles. Note that most of the 3D models used in the present analysis can be found in a prior data release on Zenodo.org (hƩps://doi.org/10.5281/zenodo.14590062). A key linking the present specimen IDs to those in the prior release can be found in Appendix1_RSA_angles_EXPANDED.xlsx, Sheet ‘2D vs. 3D’, column M. Those models missing from the prior release (i.e., listed as ‘NA’ in Appendix1) are provided here using the naming convenon consistent with the present release. Page 2 of 3 Provided Data Files Appendix1_RSA_angles_EXPANDED.xlsx Sheet 1 ‘2D vs. 3D’: Specimen demographics, 2D RSA Angle, 3D RSA Angle, and their difference (3D-2D) for each specimen. This sheet also links the specimen IDs in the present study to anatomic models and landmarks of the shoulder, previously released on Zenodo.org. Sheet 2 ‘Viewing PerspecƟves’: The RSA Angle in N=10 specimens at various viewing perspecves in anteversion, retroversion, extension, and flexion. This file is an expanded version from that provided in the original arcle, containing addional informaon. Appendix2_RSA_angles_EXPANDED.pptx A PDF containing the image data used to create the RSA Angle measurements contained in Appendix1. This file is an expanded version from that provided in the original arcle, containing addional informaon. Filename_scapula.stl These 3D surface models supplement those already available in the prior release on Zenodo.org. Naming convenƟon In Appendix1 Specimen ID#_sex_age_side 1. E.g., C100760_M_44_R – specimen C100760, that is Male, 44 years old, Right side imaged In Appendix2 Specimen ID#_side_ante/retroversion_extension/flexion viewing perspecve 1. E.g., C100760_R_0_40ext – specimen C100760, Right side imaged, 0 degrees ante/retroversion, 40 degrees extension a. Neutral = true AP (0 ante/retroversion, 0 extension/flexion) b. Anteversion range: 5, 10, 15, 20, 30, 40 degrees c. Retroversion range: 5, 10, 15, 20, 30, 40 degrees d. Extension range: 5, 10, 15, 20, 30, 40 degrees e. Flexion range: 5, 10, 15, 20, 30, 40 degrees Page 3 of 3 Data provided in this repository were generated with support from the NaƟonal InsƟtute of ArthriƟs and Musculoskeletal and Skin Diseases (NIAMS) of the NaƟonal InsƟtutes of Health under award number R56 AR067196, a Shared InstrumentaƟon Grant S10 OD021644, and an InvesƟgator Grant from the L.S. Peery MD Discovery Program (University of Utah). Refer to the following publicaons for detailed methods of data collecon and prior analyses using data from this repository in studies performed by our team: 1. Suter T, Gerber Popp A, Zhang Y, Zhang C, Tashjian RZ, Henninger HB. The influence of radiographic viewing perspecve and demographics on the crical shoulder angle. J Shoulder Elbow Surg. 2015 Jun;24(6):e149-58. doi: 10.1016/j.jse.2014.10.021. Epub 2015 Jan 13. PMID: 25591458; PMCID: PMC4433827. 2. Suter T, Henninger HB, Zhang Y, Wylie JD, Tashjian RZ. Comparison of measurements of the glenopolar angle in 3D CT reconstrucons of the scapula and 2D plain radiographic views. Bone Joint J. 2016 Nov;98-B(11):1510-1516. doi: 10.1302/0301-620X.98B11.37800. PMID: 27803227. 3. Chalmers PN, Suter T, Jacxsens M, Zhang Y, Zhang C, Tashjian RZ, Henninger HB. Influence of Radiographic Viewing Perspecve on Glenoid Inclinaon Measurement. J Shoulder Elb Arthroplast. 2019 Jan-Dec;3:2471549218824986. doi: 10.1177/2471549218824986. Epub 2019 Jun 6. PMID: 33437911; PMCID: PMC7799437. 4. Suter T, Krähenbühl N, Howell CK, Zhang Y, Henninger HB. Viewing perspecve malrotaon influences angular measurements on lateral radiographs of the scapula. J Shoulder Elbow Surg. 2020 May;29(5):1030-1039. doi: 10.1016/j.jse.2019.09.022. Epub 2019 Nov 26. PMID: 31784385; PMCID: PMC7170764. 5. Henninger HB, Suter T, Chalmers PN. Editorial Commentary: Is Your Crical Shoulder Angle Accurate? Only If You Can Verify That You Have the Correct Images. Arthroscopy. 2021 Feb;37(2):447-449. doi: 10.1016/j.arthro.2020.11.021. PMID: 33546783.