| Title: |
High variability in the degree of liner stability ratio among glenoid components of different anatomical total shoulder arthroplasty systems |
| Authors: |
Shekhbihi, Abdelkader; Abdalla, Abdelhady; Modelhart, Maximilian; Herbst, Eva; id_orcid:0 000-0003-3640-9695; Raiss, Patric; Moroder, Philipp |
| Source: |
JSES International, 10 (2) |
| Publisher Information: |
Elsevier |
| Publication Year: |
2026 |
| Collection: |
ETH Zürich Research Collection |
| Subject Terms: |
Liner stability ratio; Anatomic shoulder arthroplasty; Glenoid components; Jump height; Radius of curvature; Degree of constraint |
| Description: |
Background: Anatomic total shoulder arthroplasty (aTSA) is a viable option for select patients with favorable long-term outcomes. However, instability with static decentering and eccentric wear remains a concern. An important factor contributing to the stability of aTSA is the liner-generated stability ratio, constituted by jump-height and radius of curvature. This study aimed to measure jump height and radius of curvature as well as to assess the liner stability ratio (LSR) of various aTSA glenoid components, enabling comparisons of the degree of constraint between implant systems. Methods: Using manufacturer-independent planning software, glenoid component height, jump height, and radius of curvature in the longitudinal and transverse axes were measured across 28 aTSA systems from 14 companies by two independent raters, with transverse measurements taken at the broadest diameter (t1) and at the corresponding midpoint level of the longitudinal axis (t2); data were validated by comparison with manufacturer-provided specifications. LSR were calculated using a previously validated mathematical formula. The inter-rater reliability was determined using the intraclass correlation coefficient. Visual diagrams illustrated the relationship between glenoid component height, jump height, and LSR across glenoid components of various aTSA designs. Results: The mean glenoid component height was 32.8 ± 4.9 mm (range, 22.3-43.8 mm), while the mean jump height and radius of curvature were 5.1 ± 1.5 mm (range, 2.4-9.9 mm) and 29.7 ± 3.6 mm (range, 21.7-38.1 mm) in the longitudinal axis, 2.7 ± 0.7 mm (range, 1.5-5.1 mm) and 29.5 ± 3.9 mm (range, 19.9-38.5 mm) in the transversal axis (t1), and 2.6 ± 0.7 mm (range, 1.3-4.7 mm) and 29.7 ± 3.9 mm (range, 20.1-39.7 mm) for t2, respectively. Calculated LSR ranged from 39% to 115% (68% ± 15%) for the longitudinal axis, 31% to 71% (47% ± 8%) for t1, and from 28% to 65% (45% ± 8%) for t2, across available aTSA systems. Manufacturer-provided specifications from two companies showed high ... |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/application/pdf |
| Language: |
English |
| Relation: |
info:eu-repo/semantics/altIdentifier/wos/001693927900003; https://hdl.handle.net/20.500.11850/796278 |
| DOI: |
10.3929/ethz-c-000796278 |
| Availability: |
https://hdl.handle.net/20.500.11850/796278; https://doi.org/10.3929/ethz-c-000796278 |
| Rights: |
info:eu-repo/semantics/openAccess ; http://creativecommons.org/licenses/by-nc-nd/4.0/ ; Creative Commons Attribution- NonCommercial-NoDerivatives 4.0 International |
| Accession Number: |
edsbas.EC4B10FE |
| Database: |
BASE |