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Patient-specific Guides Using 3-dimensional Reconstruction Provide Accuracy and Reproducibility in Reverse Total Shoulder Arthroplasty
Clin Should Elbow 2019;22:16-23
Published online March 1, 2019;  https://doi.org/10.5397/cise.2019.22.1.16
© 2019 Korean Shoulder and Elbow Society.

Jong Pil Yoon , Dong Hyun Kim, Jae Wook Jung, Chang-Hwa Lee, Seunggi Min, Hyun Joo Lee, Hee-June Kim

Department of Orthopaedic Surgery, Kyungpook National University Hospital, Daegu, Korea
Correspondence to: Jong Pil Yoon
Department of Orthopaedic Surgery, Kyungpook National University College of Medicine, 130 Dongdeok-ro, Jung-gu, Daegu 41944, Korea
Tel: +82-53-420-5628, Fax: +82-53-422-6605, E-mail: jpyoon@knu.ac.kr, ORCID: https://orcid.org/0000-0001-6446-6254
A cadaver study does not need an IRB approval.
Received August 15, 2018; Revised October 10, 2018; Accepted October 31, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
Background: We aimed to evaluate whether the use of our novel patient-specific guide (PSG) with 3-dimensional reconstruction in reverse total shoulder arthroplasty (RTSA) would allow accurate and reliable implantation of the glenoid and humeral components.
Methods: 20 fresh-frozen cadaveric shoulders were used. The PSG group (n=10) and conventional group (n=10) was evaluated the accuracy and reproducibility of implant positioning between before and after surgery on the computed tomography image.
Results: The superoinferior and anteroposterior offset in the glenoid component were 0.42 짹 0.07, 0.50 짹 0.08 in the conventional
group and 0.45 짹 0.03, 0.46 짹 0.02 in the PSG group. The inclination and version angles were -1.93째 짹 4.31째, 2.27째 짹 5.91째 and 0.46째
짹 0.02째, 3.38째 짹 2.79째. The standard deviation showed a smaller difference in the PSG group. The anteroposterior and lateromedial
humeral canal center offset in the humeral component were 0.45 짹 0.12, 0.48 짹 0.15 in the conventional group and 0.46 짹 0.59
(p=0.794), 0.46 짹 0.06 (p=0.702) in the PSG group. The PSG showed significantly better humeral stem alignment.
Conclusions: The use of PSGs with 3-dimensional reconstruction reduces variabilities in glenoid and humerus component positions and
prevents extreme positioning errors in RTSA.
Keywords : Reverse total shoulder arthroplasty; Patient-specific guide; Glenoid component; Humeral component; Positioning