A Study of Collagen Crimp Pattern in the Bovine Anterior and Posterior Medial Meniscal Horn Attachments

2007 ◽  
Author(s):  
Diego Villegas ◽  
William Dehlin ◽  
Tammy L. Haut Donahue
Keyword(s):  
Mechanical Properties ◽  
Stress Relaxation ◽  
Knee Joint ◽  
Tibial Plateau ◽  
Ultimate Strain ◽  
Theoretical Studies ◽  
Joint Lubrication ◽  
Meniscal Attachments ◽  
Experimental And Theoretical Studies ◽  
Femoral Condyles

Menisci are fibrocartilagenous structures located between the femoral condyles and tibial plateau that aid in joint lubrication and stability in the knee joint. Previous experimental and theoretical studies have shown that the meniscal horn attachments, which serve as the transition from mensical fibrocartilage into subchondral bone, are important for proper meniscal function [1–3]. Meniscal attachments did not show significant differences in surface mechanical properties such as ultimate strain or moduli, however, there were significant differences in overall behavior of the anterior versus posterior attachments [4]. No significant differences in creep or stress relaxation properties were found between the different meniscal attachments [5].

Nano-Mechanical Properties of Human Meniscal Surfaces

2011 ◽  
Author(s):  
John T. Moyer ◽  
Adam C. Abraham ◽  
Tammy L. Haut Donahue
Keyword(s):  
Mechanical Properties ◽  
Load Distribution ◽  
Tibial Plateau ◽  
Structural Integrity ◽  
Human Knee ◽  
Water Matrix ◽  
Human Knee Joint ◽  
Compressive Loads ◽  
Bone Research ◽  
Femoral Condyles

Osteoarthritis (OA) is a crippling disease in humans that deteriorates the articular cartilage (AC) and subchondral bone. Research has shown AC preservation is most important for halting the initiation of OA, in the human knee joint, and this defense is contingent on the structural integrity of the menisci [1, 2]. The menisci are fibrocartilaginous structures which are crucial for proper load distribution in the knee [3–5]. The menisci are specifically designed to fit the contour of the femoral condyles, aiding to disperse the stresses on the tibial plateau and in turn safeguarding the underlying AC. Circumferentially aligned collagen fibers help to support the menisci while in tension, while a proteoglycan and water matrix reinforce the menisci during compressive loads [2, 6].

scholarly journals Biomechanical Performance of Menisci under Cyclic Loads

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
J.-G. Tseng ◽  
B.-W. Huang ◽  
Y.-T. Chen ◽  
S.-J. Kuo ◽  
G.-W. Tseng
Keyword(s):  
Knee Joint ◽  
Dynamic Characteristics ◽  
Tibial Plateau ◽  
Articular Surface ◽  
Mode Shapes ◽  
Actual State ◽  
Human Body Model ◽  
Human Knee Joint ◽  
Fatigue Life Analysis ◽  
Femoral Condyles

The meniscus, composed of fibrocartilage, is a very important part of the human knee joint that behaves like a buffer. Located in the middle of the femoral condyles and the tibial plateau, it is a necessary structure to maintain normal biomechanical properties of the knee. Whether walking or exercising, the meniscus plays a vital role to protect the articular surface of both the femoral condyles and the tibial plateau by absorbing the conveying shock from body weight. However, modern people often suffer from irreversible degeneration of joint tissue due to exercise-induced harm or aging. Therefore, understanding its dynamic characteristics will help to learn more about the actual state of motion and to avoid unnecessary injury. This study uses reverse engineering equipment, a 3D optical scanner, and a plastic teaching human body model to build the geometry of knee joint meniscus. Then, the finite element method (FEM) is employed to obtain the dynamic characteristics of the meniscus. The results show the natural frequencies, mode shapes, and fatigue life analysis of meniscus, with real human material parameters. The achieved results can be applied to do subsequent knee dynamic simulation analysis, to reduce the knee joint and lower external impacts, and to manufacture artificial meniscus through tissue engineering.

scholarly journals The deformability of the stress-strained concrete strips between the cracks during the short-term dynamic loading

2020 ◽  
Vol 315 ◽  
pp. 07002
Author(s):  
Zaur Galyautdinov ◽  
Oleg Kumpyak ◽  
Daud Galyautdinov
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Dynamic Loading ◽  
Experimental Research ◽  
Inclination Angle ◽  
Dynamic Load ◽  
Statistic Analysis ◽  
Theoretical Studies ◽  
Short Term ◽  
Experimental And Theoretical Studies

The formation of non-intersecting cracks in stress-strained ferroconcrete elements leads to separation of concrete strips between the cracks. The results of the experimental research indicate a significant decrease of the durability and deformability of the stress-strained concrete strips between cracks both under static and short-term dynamic loading. At the same time physico-mechanical properties depend on the straining deformations and rebars’ inclination angle towards the cracks. The existing theoretical and experimental results evaluate only the durability of the concrete strips between the cracks. The current paper presents the results of experimental and theoretical studies on the dynamic deformability of the stress-strained discs between the cracks. The statistic analysis of the experimental data is done; on the basis of the analysis we suggest the dependencies, characterizing the deformability of the concrete strips during the short-term dynamic load depending on the level of the straining deformations and rebars’ inclination angle towards the cracks.

Sign in / Sign up

Export Citation Format

Share Document