Mechanical properties of callus in human tibial fractures: a preliminary investigation

Moorcroft, C I; Ogrodnik, Peter; Thomas, Peter; Wade, Roger

doi:10.1016/s0268-0033(01)00079-1

Cited by 20 publications

(15 citation statements)

References 20 publications

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“…2(b)). Controlling the movement of the travelling capstan reducing the fracture prior to fixation using the Staffordshire orthopaedic reduction machine [16]. controls the rate of loading and the loading profile.…”

Section: Introductionmentioning

confidence: 99%

“…As each patient has bone screws that are permanently oriented in one plane, they are the of behaviour [19]. As presented in previous papers [14,16,17], the stiffness varies with the applied load best reference planes. The diagram is also annotated with the planes relating to the orientation of the pins, rate and the apparent stiffness increases as the load rate increases.…”

Section: Introductionmentioning

confidence: 99%

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Measuring multi-dimensional, time-dependent mechanical properties of a human tibial fracture using an automated system

Ogrodnik

Moorcroft

Thomas

2007

Proc Inst Mech Eng H

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This paper presents an element of a long-term research project determining a clinically quantifiable end point for fracture healing in humans. An automated loading and measurement device is presented. It has been developed as a research tool for the assessment of the mechanical properties of a healing human tibial fracture. The device has been specifically designed for use with patients treated with external fixation. The characteristics of the device have been presented together with an assessment of errors. A typical sample of results has been presented to demonstrate the significance of the device; subsequent papers will examine the whole data set in greater depth. The results presented here confirm the non-linear behaviour of callus and reinforce the requirement to measure the load rate when measuring the fracture stiffness. A new material property for the assessment of fracture healing, namely gamma, is examined and preliminary results are shown. Polar plots of stiffness demonstrate that, when measuring fracture stiffness, not only should the load rate be considered, but also the orientation of measurement. The results from this work support the view that the fracture stiffness should be measured in at least two planes. Currently a fracture can be considered healed when the fracture stiffness exceeds 15 N m/deg; this paper questions whether this value is now valid and suggests that it should be re-examined.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measuring multi-dimensional, time-dependent mechanical properties of a human tibial fracture using an automated system

Ogrodnik

Moorcroft

Thomas

2007

Proc Inst Mech Eng H

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“…Previous work [15,17,18] has demonstrated that stiffness varies with applied load-rate and the apparent stiffness increases as load-rate increases. Figs.…”

Section: Presentation and Discussion Of Resultsmentioning

confidence: 97%

“…It gave support for the development of a system that measures the properties whilst controlling loading so that "load-rate errors" are minimised. Wade et al [16] and Moorcroft et al [17] extended the use of the system to determine multi-dimensional stiffness. Their work further confirmed the need for a system that controlled loading.…”

Section: Introductionmentioning

confidence: 99%

An automated system for measuring multi-dimensional, time dependent mechanical properties of a human tibial fracture

Ogrodnik¹,

Moorcroft²,

Thomas³

2007

Medical Engineering & Physics

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“…The need for reliable methods to assess the stage and progress of healing is evident. Experimental and clinical evaluations of direct, indirect, invasive and non-invasive mechanical measurements of the healing fracture have been published [7-19]. …”

Section: Introductionmentioning

confidence: 99%

In vivo measurement of bending stiffness in fracture healing

Hente

Cordey²,

Perren

2003

BioMed Eng OnLine

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Background: Measurement of the bending stiffness a healing fracture represents a valid variable in the assessment of fracture healing. However, currently available methods typically have high measurement errors, even for mild pin loosening. Furthermore, these methods cannot provide actual values of bending stiffness, which precludes comparisons among individual fractures. Thus, even today, little information is available with regards to the fracture healing pattern with respect to actual values of bending stiffness. Our goals were, therefore: to develop a measurement device that would allow accurate and sensitive measurement of bending stiffness, even in the presence of mild pin loosening; to describe the course of healing in individual fractures; and help to evaluate whether the individual pattern of bending stiffness can be predicted at an early stage of healing.

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Mechanical properties of callus in human tibial fractures: a preliminary investigation

Cited by 20 publications

References 20 publications

Measuring multi-dimensional, time-dependent mechanical properties of a human tibial fracture using an automated system

Measuring multi-dimensional, time-dependent mechanical properties of a human tibial fracture using an automated system

An automated system for measuring multi-dimensional, time dependent mechanical properties of a human tibial fracture

In vivo measurement of bending stiffness in fracture healing

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