Customized Humeral Head Prostheses Design

Both elliptical and spherical prosthetic humeral heads were custom made (Arthrex Inc., Naples, FL, USA). The designs, including equations for dimension width, radius of curvature, and height, were chosen according to previously published studies [7 (link), 8 (link)]. A small hole in the undersurface allowed for securely placing the humeral head prosthesis on the protruding spike of the trunnion, avoiding rotation of the head prosthesis during testing and allowing for easily switching heads between testing conditions.

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Muench L.N., Murphey M., Oei B., Kia C., Obopilwe E., Cote M.P., Mazzocca A.D, & Berthold D.P. (2023). Elliptical and spherical heads show similar obligate glenohumeral translation during axial rotation in total shoulder arthroplasty. BMC Musculoskeletal Disorders, 24, 171.

Publication 2023

Heads Humeral head prosthesis Humeral heads Prosthesis Radius

Corresponding Organization : Technical University of Munich

Other organizations : UConn Health, Massachusetts General Hospital, Harvard University, Ludwig-Maximilians-Universität München

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Variable analysis

independent variables

Elliptical prosthetic humeral heads
Spherical prosthetic humeral heads

dependent variables

Rotation of the head prosthesis during testing

control variables

Hole in the undersurface of the humeral head prosthesis
Protruding spike of the trunnion

controls

Positive control: Securely placing the humeral head prosthesis on the protruding spike of the trunnion to avoid rotation of the head prosthesis during testing
Negative control: Not specified

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