Estimation of the mechanical loading of the shoulder joint in daily conditions

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The goal of this thesis is to assemble a method to estimate shoulder joint reaction forces, in daily conditions, based on long term collection of ambulatory measurable variables, to obtain the desired long term mechanical load profile of the shoulder. Chapter 2 examines, and discusses one of the general assumptions used in IMMS is: the homogeneousness of the earth magnetic field. Chapter 3 describes a method and its accuracy in obtaining anatomically interpretable coordinate systems for the segments of the upper extremity using only IMMS, under daily conditions. Chapter 4 describes an experiment in which the NN method is used to predict input for a musculoskeletal model, to obtain ambulatory joint loading in more detail. Chapter 5 explores the direct prediction of joint reaction forces at the glenohumeral head. Several factors which might influence the predictive power of neural networks are examined. In Chapter 6 the method is discussed on its strengths and weaknesses, and the feasibility for obtaining a detailed joint load profile under daily conditions. This chapter ends with future directions to improve the method or tailor it to more specific research questions.