Cyclic mechanical property degradation during fatigue loading of cortical bone

Pattin, Cheryl A.; Caler, William E.; Carter, D.R.

doi:10.1016/0021-9290(94)00156-1

Cited by 384 publications

(302 citation statements)

References 25 publications

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“…The mechanical properties between the two species under monotonic and fatigue loading are also comparable [11,30]. Specifically, it has been shown that bovine bone displays similar ratios (1 :2:3) of monotonic strength under torsional, tensile, and compressive loads [40], which are known to determine the damage threshold and fatigue life in cortical bone [28]. Nonetheless, while offering significant insight in the damage mechanisms of physiologically loaded human cortical bone, the use of bovine bone over human bone remains a limitation to this study.…”

Section: Resultsmentioning

confidence: 99%

Damage mechanisms and failure modes of cortical bone under components of physiological loading

George

Vashishth

2005

Journal Orthopaedic Research

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Fatigue damage development in cortical bone was investigated in vitro under different mechanical components of physiological loading including tension, compression, and torsion. During each test, stress and strain data were collected continuously to monitor and statistically determine the occurrence of the primary, secondary, and tertiary stages associated with fatigue and/or creep failure of bone. The resultant microdamage and failure modes were identified by histological and fractographic analysis, respectively. The tensile group demonstrated Mode I cracking and the three classic stages of fatigue and creep suggesting a low crack initiation threshold, steady crack propagation and final failure by coalescence of microcracks. In contrast, the compressive group displayed Mode I1 cracking and a two-stage fatigue behavior with limited creep suggesting a high crack initiation threshold followed by a sudden fracture. The torsion group also displayed a two-stage fatigue profile but demonstrated extensive damage from mixed mode (Modes I1 and 111) microcracking and predominant time-dependant damage. Thus, fatigue behavior of bone was found to be uniquely related to the individual mechanical components of physiological loading and the latter determined the specific damage mechanisms associated with fatigue fracture.

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Section: Resultsmentioning

confidence: 99%

Damage mechanisms and failure modes of cortical bone under components of physiological loading

George

Vashishth

2005

Journal Orthopaedic Research

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“…Finally, our loading scenario and its quasistatic nature are controllable and reproducible rather than physiologic. This choice of loading is legitimate as quasistatic and passive fatigue properties of bone scale well in terms of strains [17,18]. It addresses the safety concerns during the first days after surgery when remodeling could be activated, but not yet in progress.…”

Section: Discussionmentioning

confidence: 99%

Head-Neck Osteoplasty has Minor Effect on the Strength of an Ovine Cam-FAI Model: In Vitro and Finite Element Analyses

Maquer

Bürki

Nuss

et al. 2016

Clinical Orthopaedics &Amp; Related Research

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Background Osteochondroplasty of the head-neck region is performed on patients with cam femoroacetabular impingement (FAI) without fully understanding its repercussion on the integrity of the femur. Cam-type FAI can be surgically and reproducibly induced in the ovine femur, which makes it suitable for studying corrective surgery in a consistent way. Finite element models built on quantitative CT (QCT) are computer tools that can be used to predict femoral strength and evaluate the mechanical effect of surgical correction. Questions/purposes We asked: (1) What is the effect of a resection of the superolateral aspect of the ovine femoral head-neck junction on failure load? (2) How does the failure load after osteochondroplasty compare with reported forces from activities of daily living in sheep? (3) How do failure loads and failure locations from the computer simulations compare with the experiments? Methods Osteochondroplasties (3, 6, 9 mm) were performed on one side of 18 ovine femoral pairs with the contralateral intact side as a control. The 36 femurs were scanned via QCT from which specimen-specific computer models were built. Destructive compression tests then were conducted experimentally using a servohydraulic testing system and numerically via the computer models. Safety factors were calculated as the ratio of the maximal force measured in vivo by telemeterized hip implants during the sheep's walking and running activities to the failure load. The simulated failure loads and failure locations from the computer models were compared with the experimental results. Results Failure loads were reduced by 5% (95% CI, 2%-8%) for the 3-mm group (p = 0.0089), 10% (95% CI, 6%-14%) for the 6-mm group (p = 0.0015), and 19% (95% CI, 13%-26%) for the 9-mm group (p = 0.0097) compared with the controls. Yet, the weakest specimen still supported more than 2.4 times the peak load during running. Strong correspondence was found between the simulated and experimental failure loads (R 2 = 0.83; p \ 0.001) and failure locations. Conclusions The resistance of ovine femurs to fracture decreased with deeper resections. However, under in vitro testing conditions, the effect on femoral strength remains small even after 9 mm correction, suggesting that femoral

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“…) [56]. To avoid numerical convergence problems, the critical damage value at fracture was set to 95…”

Section: In Tensionmentioning

confidence: 99%

A quasi-brittle continuum damage finite element model of the human proximal femur based on element deletion

Hambli

2012

Med Biol Eng Comput

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Cyclic mechanical property degradation during fatigue loading of cortical bone

Cited by 384 publications

References 25 publications

Damage mechanisms and failure modes of cortical bone under components of physiological loading

Damage mechanisms and failure modes of cortical bone under components of physiological loading

Head-Neck Osteoplasty has Minor Effect on the Strength of an Ovine Cam-FAI Model: In Vitro and Finite Element Analyses

A quasi-brittle continuum damage finite element model of the human proximal femur based on element deletion

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