Understanding mechanical trade-offs in changing centers of rotation for reverse shoulder arthroplasty design

Recommended Citation Permeswaran, Vijay Niels. "Understanding mechanical trade-offs in changing centers of rotation for reverse shoulder arthroplasty design." MS ii ACKNOWLEDGMENTS I would like to thank my advisor and thesis supervisor, Dr. Don Anderson, for his support and guidance during my graduate education. I have learned much about modeling and research, and my progress and success can be linked to his hard work. In addition, I want to thank Dr. Jessica Goetz for providing technical help and general support, as well as lending direction and guidance in the development of this document. Also, I would like to thank Dr. Carolyn Hettrich for her clinical expertise, passion for shoulder research, and funding, without which this project would not exist. Furthermore, I want to thank Drs. Nicole Grosland and Tom Brown for their assistance in advancing my academic excursion. Additionally, I would like to thank the many other student and staff researchers in the Orthopaedic Biomechanics Research Laboratory. The many long hours I spent working were made easier by your presence, camaraderie, and insightful knowledge. Finally I would like to thank my loved ones for pushing, supporting, caring, and putting up with me during this time. I could not have done any of this without all of you. Figure 1-1 Anatomy of the human shoulder. Bones include the clavicle, the acromion and the coracoid process of the scapula, and the humerus. The origins and insertions of several rotator cuff muscles (supraspinatus, infraspinatus, subscapularis, teres minor) are also shown. The glenoid surface and capsular ligaments are shown in the inset. Figure 1-2 Frontal and lateral views of patient with CTA and pseudoparalysis (right arm). Patient exhibits stark difference in range of motion between diseased and healthy shoulder. Figure 1-3 Frontal plane radiograph of shoulder arthrodesis. The purpose of the implanted construct is to prevent any motion of the humerus relative to the scapula, fixing the glenohumeral joint. Taken from Nam et al. Figure 1-4 Glenoid erosion classifications and corresponding radiographs. As humeral superior loading increases, glenoid cartilage and bone degradation intensifies. Taken from Sirveaux et al. Figure 1-6 Diagram of the progression of scapular notching. The far left image shows no erosion of the inferior glenoid region and the far right shows a scapular notch progressing past the inferior fixation screw and approaching the central peg of the baseplate. Taken from (Boileau et al. Figure 1-7 Radiograph and ex-vivo image of shoulder retrieval …