In a recent study, our group has highlighted the importance of considering the natural topographic variability of the mechanical properties over the articular surface, particularly in the context of cartilage repair, where it can screen the effect of a treatment [1]. Moreover, the availability of test sample is limited in those repair studies since the regions of interest are often limited in size....Read More

Significance and Use

                                            4.1 Measurements of frictional properties may be made on a film or sheeting specimen when sliding over itself or over another substance. The coefficients of friction are related to the slip properties of plastic films that are of wide interest in packaging applications. These methods yield empirical data for control purposes in film production. Correlation...Read More

Abstract

                                            This specification covers the material requirements and characterization techniques for glass and glass-ceramic biomaterials intended for use as bulk porous or powdered surgical implants, or as coatings on surgical devices, but not including drug delivery systems. Glass and glass-ceramic biomaterials should be evaluated thoroughly for biocompatibility before human use....Read More

Significance and Use

                                        This guide is aimed at providing a range of in vivo models to aid in preclinical research and development of tissue engineered medical products intended for the clinical repair or regeneration of articular cartilage.

This guide includes a description of the animal models, surgical considerations, and tissue processing as well as the qualitative and titative...Read More

Purpose

                                            This procedure describes a standard method to realize a friction test on a cartilage disk or an osteochondral core using the Mach-1 TM mechanical tester.

Scope

                                            This procedure can be used for the ex vivo friction test using a planar sliding method on a cartilage disk or an osteochondral core. It is highly...Read More

Biological tissues at articulating surfaces, such as articular cartilage, typically have remarkable low-friction properties that limit tissue shear during movement. However, these frictional properties change with trauma, aging, and disease, resulting in an altered mechanical state within the tissues. Yet, it remains unclear how these surface changes affect the behaviour of embedded cells when the...Read More

There has been much interest in using autologous chondrocytes in combination with scaffold materials to aid in cartilage repair. In the present study, a total of 27 animals were used to compare the performance of matrix-assisted chondrocyte implantation (MACIs) using a collagen sponge as a chondrocyte delivery vehicle, the sponge membrane alone, and empty controls. A total of three distinct types of...Read More

OBJECTIVES: The lubrication of articulating cartilage surfaces in joints occurs through several distinct modes. In the boundary mode of lubrication, load is supported by surface-to-surface contact, a feature that makes this mode particularly important for maintenance of the normally pristine articular surface. A boundary mode of lubrication is indicated by a kinetic friction coefficient...Read More

Introduction: We published a recent study showing superior sensitivity of electromechanical and indentation (instantaneous response) assessments versus well-established techniques, including histological Mankin score, to characterize cartilage degeneration. This study aims to determine whether the combination of instantaneous, relaxation and equilibrium mechanical properties and friction...Read More

Introduction: During joint articulation, cartilage, particularly that near the articular surface, undergoes a complex combination of compression, shear, and sliding.1,2 In vitro analyses have focused on cartilage biomechanics in response to relative surface movement at a constant velocity after startup. However, joint movement typically involves variability in the relative surface velocity....Read More

Accurate tissue phantoms are difficult to design due to the complex non-linear viscoelastic properties of real soft tissues. A composite hydrogel, resulting from a mix of poly(vinyl) alcohol and phytagel, is able to reproduce the viscoelastic responses of different soft tissues due to its compositional tunability. The aim of this work is to demonstrate the flexibility of the composite hydrogel...Read More