The objectives of this study were to describe a technique for measuring in-vivo glenohumeral joint contact patterns during dynamic activities and to demonstrate application of this technique. The experimental technique calculated joint contact patterns by combining CT-based 3D bone models with joint motion data that were accurately measured from biplane x-ray images. Joint contact patterns were...

At the beginning of 1941, Ludwig Föppl published an 8-page paper “Elastische Beanspruchung des Erdbodens unter Fundamenten”. The main result this was further developed by his doctoral student Gerhard Schubert in 1942. These publications and contain many results obtained researchers contact mechanics subsequent decades 20th century. Unfortunately, both papers have been forgotten, which is not pa...

In this paper, we continue the construction of variational integrators adapted to contact geometry started in \cite{VBS}, particular, introduce a discrete Herglotz Principle and corresponding Equations for Lagrangian setting. This allows us develop convenient numerical systems that are conformally by construction. The existence an exact function is also discussed.