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Posteroinferior Relevant Scapular Neck Offset in Reverse Shoulder Arthroplasty: Key Player for Motion and Friction-type Impingement in a Computer Model by Stefan Bauer; William G. Blakeney; Navendu Goyal; Hugo Flayac; Allan Wang; Jocelyn Corbaz is a Medicine article available to read on EtoBox.

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## Background: Range of motion (rom) and prevention of notching remain a challenge for reverse shoulder arthroplasty (rsa). both may be affected by the morphology of the scapula. the purpose of this study was to define anteroinferior (a) and posteroinferior (p) relevant scapular neck offset (rsno) and to examine the hypothesis that prsno is significantly smaller than arsno, and influences rigid body motion (rbm). adapting glenosphere implantation strategies may therefore be of value. ## Material and methods: In this computer model study, we used deidentified computed tomographic scans of 22 patients (11 male and 11 female; mean age: 72.9 years) with massive cuff tears without joint space narrowing. eight rsa glenoid configurations were tested with a constant neck-shaft angle (145°). two baseplate types (25 mm; 25 + 3 mm lateralized) and 4 glenospheres (gs) (36 mm; 36 +2 mm of eccentricity; 39 mm; 39 + 3 mm) were used. rsno was defined as the standardized measurement of the horizontal distance from the inferior extent of the gs to the bony margin of the scapula after baseplate positioning (flush to inferior glenoid extent; neutral position: 0° inclination and 0° version-both softwar

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Author

Stefan Bauer; William G. Blakeney; Navendu Goyal; Hugo Flayac; Allan Wang; Jocelyn Corbaz

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Medicine (Health Sciences)