Date of Award

1-1-2019

Document Type

Thesis

Degree Name

M.S.

Department

Mechanical Engineering

First Advisor

Kevin B. Shelburne, Ph.D.

Keywords

Anatomic total shoulder arthroplasty, Biplane radiography, Individuals, Kinematics, Reverse total shoulder arthroplasty

Abstract

Total Shoulder Arthroplasty (TSA) is a surgery which replaces the shoulder joint, or the interface between the humerus and the scapula glenoid. To test TSA success, most prior research compares patients with TSA to healthy controls. However, the shoulder anthropometry, motion, and musculature of individuals varies widely across the population making it important to assess TSA performance in individuals. The overall goal of this study is to determine if patients with one of two TSA implant designs on one side achieve the same range of motion as their intact side, and if so to find if they compensate using increased scapula rotation over normal humeral motion. Six TSA subjects performed for each shoulder abduction, forward flexion, and internal/external (I/E) humerus rotation with their arm abducted to 0° and 90°, captured as x-ray videos with a Radiography System. Glenohumeral and scapulothoracic kinematics were calculated. Results show that TSA shoulder trends for abduction and flexion lie within the range of healthy standard deviation for both glenohumeral and scapulothoracic elevation. No substantial differences were observed between TSA and healthy shoulders’ overall motion but that the scapula exhibits some compensation in elevation for TSA shoulders, especially in flexion. I/E implanted shoulder results additionally show a deficit compared to intact shoulders, with scapula retraction compensation presenting more strongly with the arm abducted to 0° than at 90°.

Publication Statement

Copyright is held by the author. User is responsible for all copyright compliance.

Provenance

Received from ProQuest

Rights holder

Sarah Rose Walden

File size

141 p.

File format

application/pdf

Language

en

Discipline

Biomechanics, Surgery, Mechanical engineering

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