The vibrational mode of the tibia and assessment of bone union in experimental fracture healing using the impulse response method

Nakatsuchi, Yukio; Tsuchikane, Akira; Nomura, Akio

doi:10.1016/1350-4533(96)00010-0

Cited by 42 publications

(28 citation statements)

References 22 publications

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“…When comparing the natural frequencies calculated from FE models, a higher natural frequency is derived for dry bone relative to the wet material, with a ratio of 1.13 demonstrated in this study. This finding is in line with previous modal testing experiments [29], with these works also finding dry tibia bone has a higher natural frequency relative to the wet analog. This is probably due to the larger Young's modulus of the former [33].…”

Section: Discussionsupporting

confidence: 93%

“…1. The tested mandibles were supported on sponge to approximate a free-support condition [18,29], and then forced into vibration by an impulse force hammer (Model GK291C80; PCB Piezotronics, Buffalo, NY, USA). Applied by hand, the exciting force was directly applied to the surface along the lingual-labial or lingual-buccal direction (frontal or posterior position, respectively).…”

Section: In Vitro Modal Testingmentioning

confidence: 99%

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Vibrational analysis of mandible trauma: experimental and numerical approaches

Lin¹,

Lee²,

Lee³

et al. 2006

Med Bio Eng Comput

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The aim of this study was to evaluate the effectiveness of vibrational assessment of the mandible fracture patterns. Measurement of natural frequencies and associated vibrational mode shapes was performed to determine the relationship between the dynamic behavior of the human mandible and incidence of mandibular fractures using both in vitro modal testing and finite element analysis. Our results show that the natural frequencies of the human mandible in dry and wet conditions are 567 Hz and 501 Hz, respectively. The first vibrational mode of human mandible is a bending vibration with nodes located at the mandibular body where bone fracture is less likely to occur. By contrast, high vibration amplitudes were identified in the symphysis/parasymphysis and subcondyle regions where bone fractures tend occur. These findings indicate that the vibrational characteristics of the mandible are potential parameters for assessment of the mechanisms of injury.

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Section: Discussionsupporting

confidence: 93%

Section: In Vitro Modal Testingmentioning

confidence: 99%

Vibrational analysis of mandible trauma: experimental and numerical approaches

Lin¹,

Lee²,

Lee³

et al. 2006

Med Bio Eng Comput

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show abstract

“…With support of advanced computer technology, clinical diagnostic systems have been successfully developed based on vibration analysis techniques. 24 For example, Nakatsuchi et al 22 attempted to use the impulse response method in the assessment of fracture healing. In his in-vitro study the resonant frequency demonstrated a steady increase during the initial phase of consolidation of the adhesive, up to about 40% of its final hardness.…”

Section: Introductionmentioning

confidence: 99%

Natural Frequency Analysis of Osseointegration for Trans-femoral Implant

Shao

Crocombe

et al. 2007

Ann Biomed Eng

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Osseointegration trans-femoral implants are a new orthopaedic anchoring method to attach prosthetic limbs. The clinical success of this promising technique depends on the effectiveness of osseointegration achieved after implantation. The aim of this study is to use the resonant characteristics of the implant system to determine the changes in stability as a reflection of boundary condition of the implant. With a small mechanical excitation, Vibration responses of the trans-femoral implant to a small mechanical excitation were measured using an accelerometer and the vibration signal was analyzed using Fast Fourier Transform (FFT) software to obtain the fundamental natural frequency (NF) of the implant system. In-vitro study was conducted using different silicone rubbers to simulate the interface condition. The result showed that a high NF corresponded to a high elastic modulus of the interface material between the implant and bone. A preliminary in-vivo study with one osseointegration trans-femoral implant patient showed that there was a decrease of NF after initial weight bearing rehabilitation. After continued weight bearing, the NF gradually returned to the pre-loading level at around day 24 and the general trend of the NF reached a stable state 38 days after the first weight bearing exercise.

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“…Prior studies have shown that the injection of several tantalum beads near the fracture site can be tracked with up to 20–50 µm of resolution. Fracture stiffness and healing can then be monitored by bead motion under load 9 . However the clinical utility of this method is offset by the specialized instrumentation and training requirements, the increased cost and time of injecting beads during surgery, and complications from bead placement and migration, all of which limit widespread adoption.…”

Section: Introductionmentioning

confidence: 99%

Implantable strain sensor to monitor fracture healing with standard radiography

Pelham

Benza

Millhouse

et al. 2017

Sci Rep

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Current orthopaedic clinical methods do not provide an objective measure of fracture healing or weight bearing for lower extremity fractures. The following report describes a novel approach involving insitu strain sensors to objectively measure fracture healing. The sensor uses a cantilevered indicator pin that responds to plate bending and an internal scale to demonstrate changes in the pin position on plain film radiographs. The long lever arm amplifies pin movement compared to interfragmentary motion, and the scale enables more accurate measurement of position changes. Testing with a human cadaver comminuted metaphyseal tibia fracture specimen demonstrated over 2.25 mm of reproducible sensor displacement on radiographs with as little as 100 N of axial compressive loading. Finite element simulations determined that pin displacement decreases as the fracture callus stiffens and that pin motion is linearly related to the strain in the callus. These results indicate that an implanted strain sensor is an effective tool to help assess bone healing after internal fixation and could provide an objective clinical measure for return to weight bearing.While a variety of fracture stabilization therapies are available to surgeons for internal fixation, the inability to directly evaluate healing remains a limiting factor when assessing patient recovery and return to a pre-injury activity level. Tibial fractures are the most common long-bone fracture (36.7% of all long-bone fractures in adults) and also happen to be the most common site of long-bone nonunion 1 . Patients with nonunion are more likely to have additional fractures during follow-up, to require various types of in-patient and surgical care (including amputation), to be prescribed pain medications (especially strong opioids), and to use more outpatient physical therapy than those with proper bony union 2 . Median total costs of care for patients with nonunion were found to be more than double those without ($25,556 vs. $11,686 according to 2006 data) 2 . To help prevent complications such as non-union or malunion, refracture and implant failure, physicians often limit weight bearing for an extended time, often 12 weeks or longer, to allow for adequate bone growth 3 . While premature weight bearing can increase the rate of complications, unnecessarily delaying weight bearing results in productivity loss with indirect costs from lost wages and places additional burdens on the healthcare system. Identification of post-operative complications (non-union, infection, implant loosening, etc.) throughout the recovery process, while critical to effective treatment, is often difficult with existing internal fixation methods.Current clinical methods of monitoring bone healing and identifying complications following an open-reduction and internal fixation (ORIF) are typically limited to a combination of symptomatic, physical examination, and radiographic findings. Interpretation is subjective, influenced both by the patient's candid description of symptoms and by the treati...

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The vibrational mode of the tibia and assessment of bone union in experimental fracture healing using the impulse response method

Cited by 42 publications

References 22 publications

Vibrational analysis of mandible trauma: experimental and numerical approaches

Vibrational analysis of mandible trauma: experimental and numerical approaches

Natural Frequency Analysis of Osseointegration for Trans-femoral Implant

Implantable strain sensor to monitor fracture healing with standard radiography

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