Experimental Modal Analysis of an In-situ Clavicle

Rusovici, Razvan; Topping, Daniel; Eriksson, Sven; Lopez, Daralys L.

doi:10.1109/embc.2019.8857808

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…The mode shapes were displayed graphically and animated within the computer software. 17 The mode shape identified visually as the first bending mode of the clavicle occurring mostly in the coronal plane of the cadaver is shown in Figure 5 and is found at a natural frequency of 1014 Hz. The plot shows the line defined by the five measurement points in its initial versus displaced position.…”

Section: Resultsmentioning

confidence: 99%

An experimental modal analysis of clavicle bending modes

Rusovici

Topping

2021

Advances in Mechanical Engineering

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Clavicle fractures are common medical emergencies; their prevention through design of protection systems depends upon understanding injury mechanisms. This work analyzes the bending natural frequencies and mode shapes of the human cadaver clavicles in situ. The method applied includes experimental modal analysis (EMA) techniques on cadaver clavicles and correlates results with previous analyses. The clavicle response to shock depends on mechanical energy transmission between load and bone and requires an understanding of modal characteristics of the clavicle as well as the frequency range of the shock. The loads acting upon the clavicle may be represented by hard impacts (i.e. sport-related hits) or loads with short durations which can excite a wide frequency spectrum. Modal analyses of clavicles have been reported in literature, but those studies were performed on the clavicles isolated from the body. As a result, those analyses found mode shapes dependent upon different boundary conditions than those found in nature. In our study, EMA employed triaxial accelerometers and a force hammer, a testing procedure was developed, and data was analyzed. The EMA was performed with the clavicle supported in situ, and results include the coronal and axial plane first bending modes. Modal parameters obtained serve to design shock mitigation systems.

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Section: Resultsmentioning

confidence: 99%

An experimental modal analysis of clavicle bending modes

Rusovici

Topping

2021

Advances in Mechanical Engineering

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“…Neugebauer et al [19] measured the rst ve normal mode shapes of human pelvic bone using a laser vibrometer. Rusovici et al [20] measured the human clavicle bending NF in situ on a cadaver. They have used a modal assurance criterion to evaluate the independence of the extracted bending modes.…”

Section: Introductionmentioning

confidence: 99%

The effect of soft tissues on dynamical behavior of bovine tibia using modal analysis

Tarzjani,

Nazari,

Mahjoob

2023

Preprint

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The dynamical behavior and vibrational characteristics of bone and the attached soft tissues, such as natural frequencies are widely used in therapeutic vibrations including the detection of the pain threshold and tissue damage, fracture healing and bone remodeling, and design of implants. Most of studies, have focused on either bone or the soft tissues to investigate the final effects of these treatments. In the present research the vibrational characteristics of combined bone-soft tissues are studied. For this purpose, the bovine tibia and its attached muscles and tendons have been targeted. The experimental results of modal tests were collected and compared with a three-dimensional finite element analysis. Bone was modeled as an inhomogeneous isotropic material. The model includes bone marrow as an isotropic homogeneous material and the attached soft tissues as an incompressible hyperelastic isotropic material. It was found that the inhomogeneity bone and considering bone marrow does not enhance much the model results. The effect of soft tissues on the natural frequencies has shown a reduction of 12% in the first two transverse modes and up to 70% in higher modes. The stiffening effect of soft tissue (due to large deformation) on the as natural frequencies was also investigated. An increase of up to 70% (at some frequencies) was observed in larger deformations.

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“…Stimulating the knee using an external vibration source and measuring the response can be a tool to address the limitations of current vibration-based knee health monitoring systems. The study of vibration transmission through the human body and correlations between the vibroacoustic properties and the structural integrity of soft tissues have been conducted using various vibration-based techniques such as modal analysis and wave-based methods [16,17]. Modal analysis usually concerns low frequency vibrations (below 20 kHz) and investigates the structural behavior in terms of natural frequencies, mode shapes, and damping characteristics [18].…”

Section: Introductionmentioning

confidence: 99%

Vibration Stimulation as a Non-Invasive Approach to Monitor the Severity of Meniscus Tears

Safaei

Bolus

Whittingslow

et al. 2021

IEEE Trans. Neural Syst. Rehabil. Eng.

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 Musculoskeletal disorders and injuries are one of the most prevalent medical conditions across age groups. Due to a high load-bearing function, the knee is particularly susceptible to injuries such as meniscus tears. Imaging techniques are commonly used to assess meniscus injuries, though this approach suffers from limitations including high cost, need for skilled personnel, and confinement to laboratory or clinical settings. Vibration-based structural monitoring methods in the form of acoustic emission analysis and vibration stimulation have the potential to address the limits associated with current diagnostic technologies. In this study, an active vibration measurement technique is employed to investigate the presence and severity of meniscus tear in cadaver limbs. In a highly controlled ex vivo experimental design, a series of cadaver knees (n=6) were evaluated under an external vibration, and the frequency response of the joint was analyzed to differentiate the intact and affected samples. Four stages of knee integrity were considered: baseline, sham surgery, meniscus tear, and meniscectomy. Analyzing the frequency response of injured legs showed significant changes compared to the baseline and sham stages at selected frequency bandwidths. Furthermore, a qualitative analytical model of the knee was developed based on the Euler-Bernoulli beam theory representing the meniscus tear as a change in the local stiffness of the system. Similar trends in frequency response modulation were observed in the experimental results and analytical model. These findings serve as a foundation for further development of wearable devices for detection and grading of meniscus tear and for improving our understanding of the physiological effects of injuries on the vibration characteristics of the knee. Such systems can also aid in quantifying rehabilitation progress following reconstructive surgery and / or during physical therapy.

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Experimental Modal Analysis of an In-situ Clavicle

Cited by 3 publications

References 9 publications

An experimental modal analysis of clavicle bending modes

An experimental modal analysis of clavicle bending modes

The effect of soft tissues on dynamical behavior of bovine tibia using modal analysis

Vibration Stimulation as a Non-Invasive Approach to Monitor the Severity of Meniscus Tears

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