Effect of two types of shoulder prosthesis on the muscle forces using a generic multibody model for different arm motions.

Background: This study aims to analyze the effects of a novel dual-bearing shoulder prosthesis and a conventional reverse shoulder prosthesis on the deltoid and rotator cuff muscle forces for four different arm motions. The dual-bearing prosthesis is a glenoid-sparing joint replacement with a moving center of rotation. It has been developed to treat rotator cuff arthropathy, providing an increased post-operative functionality.

Estimating lumbar passive stiffness behaviour from subject-specific finite element models and in vivo 6DOF kinematics.

Passive rotational stiffness of the osseo-ligamentous spine is an important input parameter for estimating in-vivo spinal loading using musculoskeletal models. These data are typically acquired from cadaveric testing. Increasingly, they are also estimated from subject-specific imaging-based finite element (FE) models, which are typically built from CT/MR data obtained in supine position and employ pure rotation kinematics.

Are asymmetric metal markings on the cone surface of ceramic femoral heads an indication of entrapped debris?

Background: The probability of in vivo failure of ceramic hip joint implants is very low (0.004-0.05%).

A quantitative in vitro method to predict the adhesion lifetime of diamond-like carbon thin films on biomedical implants.

A quantitative method using Rockwell C indentation was developed to study the adhesion of diamond-like carbon (DLC) protective coatings to the CoCrMo biomedical implant alloy when immersed in phosphate-buffered saline (PBS) solution at 37 degrees C. Two kinds of coatings with thicknesses ranging from 0.5 up to 16 microns were investigated, namely DLC and DLC/Si-DLC, where Si-DLC denotes a 90 nm thick DLC interlayer containing Si.