Abstract：
:Taper connections of modular hip prostheses are at risk of fretting and corrosion, which can result in reduced implant survival. The purpose of this study was to identify the minimum torque required to initiate a removal of the passivation layer at the taper interface as a function of assembly force and axial load. Titanium stems and cobalt-chromium heads were assembled with peak impaction forces of 4.5 kN or 6.0 kN and then mounted on a materials testing machine whilst immersed in Ringer's solution. The stems were subjected to a static axial load (1 kN or 3 kN) along the taper axis. After a period of equilibration, a torque ramp from 0 to 15 Nm was manually applied and the galvanic potential was continuously recorded. Prostheses assembled with a force of 6 kN required a significantly higher torque to start a removal of the passivation layer compared to those assembled with 4.5 kN (7.23±0.55 Nm vs. 3.92±0.97 Nm, p=0.029). No influence of the axial load on the fretting behaviour was found (p=0.486). The torque levels, which were demonstrated to initiate surface damage under either assembly force, can be readily reached during activities of daily living. The damage will be intensified in situations of large weight and high activity of the patient or malpositioning of the prosthesis.
journal_name
Med Eng Physjournal_title
Medical engineering & physicsauthors
Jauch SY,Coles LG,Ng LV,Miles AW,Gill HSdoi
10.1016/j.medengphy.2014.06.011subject
Has Abstractpub_date
2014-09-01 00:00:00pages
1140-6issue
9eissn
1350-4533issn
1873-4030pii
S1350-4533(14)00151-9journal_volume
36pub_type
杂志文章abstract：:This proof-of-concept study designs distal femur fracture plates from semi-rigid materials vs. traditional metals for toe-touch weight-bearing recommended to patients immediately after surgery. The two-fold goal was to (a) reduce stress shielding (SS) by increasing cortical bone stress thereby reducing the risk of bon...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2020.11.015
更新日期：2021-01-01 00:00:00
abstract：:To investigate the features of the gastric interdigestive pressure activity under normal physiological conditions, we have developed the wireless radiotelemetry capsule based on a telemetry technique. Twelve healthy volunteers participated in this study. Pressure activity data which are an important index of gastric m...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2008.04.017
更新日期：2009-04-01 00:00:00
abstract：:Hepatic venous pressure gradient (HVPG) is a hemodynamic index widely used for evaluating the severity of portal hypertension. Theoretically, HVPG can be measured in any of the three major (i.e., right, middle and left) hepatic veins (HVs); however, it remains unclear whether HVPGs measured in different HVs are exchan...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2020.07.022
更新日期：2020-10-01 00:00:00
abstract：:Characterising circulatory dysfunction and choosing a suitable treatment is often difficult and time consuming, and can result in a deterioration in patient condition, or unsuitable therapy choices. A stable minimal model of the human cardiovascular system (CVS) is developed with the ultimate specific aim of assisting...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2003.10.001
更新日期：2004-03-01 00:00:00
abstract：:Easy insertion of the implant and stable bone purchase is essential for an ideal dental implantation. At the implant tip, the cutting flutes and conical profile are respectively designed to reduce insertion resistance and facilitate the initial insertion. However, the tapered tip might reduce the self-tapping and bone...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2011.09.021
更新日期：2012-09-01 00:00:00
abstract：:This study presents a specimen-specific C2-C7 cervical spine finite element model that was developed using multiblock meshing techniques. The model was validated using in-house experimental flexibility data obtained from the cadaveric specimen used for mesh development. The C2-C7 specimen was subjected to pure continu...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2010.03.001
更新日期：2010-06-01 00:00:00
abstract：:Kinematic parameters for 10 normal subjects and 10 patients with ankle arthrodesis are grouped using the fuzzy cluster paradigm. The features chosen for clustering are Euler angles of the sagittal plane in the hindfoot, the forefoot and combined hindfoot and forefoot joints. Gait patterns are identified using informat...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/s1350-4533(01)00020-0
更新日期：2001-03-01 00:00:00
abstract：:The Cochlear Microphonic is one of the electrical potentials generated by the ear in response to audible stimuli. It is very difficult to measure the CM non-invasively because it has a very small magnitude (less than 1 μV). A high Common Mode Rejection Ratio (CMRR) and very large bandwidth (5 Hz-20 kHz) biomedical amp...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2012.06.017
更新日期：2012-10-01 00:00:00
abstract：:We have developed a computer-based system to simulate a guidewire in blood vessels for surgical planning, intra-operative assistance, and to facilitate the design of new guidewires. In this study, we compared simulation results with experimental results for validation of the simulation system. First, we inserted a com...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2014.09.012
更新日期：2014-12-01 00:00:00
abstract：:Zygomatic implant technology has been regarded as an alternative treatment to massive grafting surgery in the severe atrophic maxillary. Nowadays, the assistant method with a real-time surgical navigation has been applied to reduce the risks of zygomatic implant placement. However, the accuracy of the complex operatio...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2019.07.020
更新日期：2020-01-01 00:00:00
abstract：:Spinal pedicle screw fixations have been used extensively to treat fracture, tumor, infection, or degeneration of the spine. Cannulated spinal pedicle screws with bone cement augmentation might be a useful method to ameliorate screw loosening. However, cannulated spinal pedicle screws might also increase the risk of s...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2015.06.008
更新日期：2015-09-01 00:00:00
abstract：:This study describes the method of determination of the position and orientation of artificial knee implants using a single-plane radiograph. To simplify the 3D/2D matching problem, we proposed to use small markers embedded in a bone. From the image coordinates of markers, it is possible to estimate the position and o...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/s1350-4533(03)00037-7
更新日期：2003-06-01 00:00:00
abstract：:We adopt the Ensemble Empirical Mode Decomposition (EEMD) method, with an appropriate thresholding on the Intrinsic Mode Functions (IMFs), to denoise the magnetocardiography (MCG) signal. To this end, we discuss the two associated problems that relate to: (i) the amplitude of noise added to the observed signal in the ...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2014.06.023
更新日期：2014-10-01 00:00:00
abstract：:The formation of pressure ulcers can be exacerbated by a breakdown in the integrity of the patient's skin caused by poor maintenance of the skin microclimate. Patient support systems (PSSs-specialised beds, mattresses, chairs, cushions and pads) play an important role in the dissipation of heat and moisture away from ...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/s1350-4533(00)00003-5
更新日期：1999-12-01 00:00:00
abstract：:The deformation of soft tissue compromises the accuracy of image-guided surgery based on preoperative images, and restricts its applicability to surgery on or near bony structures. One way to overcome these limitations is to combine biomechanical models with sparse intraoperative data, in order to realistically warp t...
journal_title：Medical engineering & physics
pub_type： 杂志文章,评审
doi：10.1016/j.medengphy.2005.10.005
更新日期：2005-12-01 00:00:00
abstract：:Reconstruction of segmental defects in the mandible remains a challenge for maxillofacial surgery. The use of porous scaffolds is a potential method for repairing these defects. Now, additive manufacturing techniques provide a solution for the fabrication of porous scaffolds with specific geometrical shapes and comple...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2017.06.015
更新日期：2017-09-01 00:00:00
abstract：:Gastric contractions play an important role in the digestive process of the stomach. The established method for the measurement of gastric contractions is invasive and involves the insertion through the nose of a manometric probe into the stomach. A non-invasive method is introduced in this paper for the identificatio...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/1350-4533(95)95713-k
更新日期：1995-04-01 00:00:00
abstract：:Image-based finite element modelling has been commonly used to determine the biomechanical behaviours of human femora, particularly for the diagnosis of femoral head necrosis. One of the fundamental aspects of biomechanical modelling is the relationship between bone density, which is obtained from images, and elastic ...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2019.02.002
更新日期：2019-04-01 00:00:00
abstract：:A portable, lightweight home ankle exerciser was designed and built by the Biomedical Engineering Department of University Hospital in London, Ontario, Canada. The ankle exerciser incorporates several unique features that overcomes the drawbacks of exercise equipment presently available. For optimal muscle strengtheni...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/1350-4533(95)00057-7
更新日期：1996-06-01 00:00:00
abstract：:Aims of the present study were to test the hypotheses that (1) the compressive properties of articular cartilage are affected more by changes in the medium ionic concentration than the tensile properties, (2) collagen network controls the compression-tension nonlinearity of articular cartilage, and (3) proteoglycan (P...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2009.11.004
更新日期：2010-03-01 00:00:00
abstract：:Pulse transit time (PTT) has emerged over the recent decades as a simple and non-invasive measure to quantify inspiratory effort changes in adults with sleep disordered breathing (SDB). Hence, this shows promise to be an effective screening tool for the paediatrics. However, little is known about its utility and suita...
journal_title：Medical engineering & physics
pub_type： 杂志文章,评审
doi：10.1016/j.medengphy.2006.01.006
更新日期：2007-01-01 00:00:00
abstract：:Functional Electrical Stimulation (FES) is a well known clinical rehabilitation procedure, however the neural mechanisms that underlie this treatment at Central Nervous System (CNS) level are still not completely understood. Functional magnetic resonance imaging (fMRI) is a suitable tool to investigate effects of reha...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2011.04.005
更新日期：2011-10-01 00:00:00
abstract：:An ambulatory monitoring system has been developed to measure the weight-bearing achieved by a patient on their fractured leg. The system is lightweight, portable, and can monitor weight-bearing continuously over an extended period of time. In addition to mean weight-bearing, the system can also determine temporal par...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/s1350-4533(98)00061-7
更新日期：1998-10-01 00:00:00
abstract：:This paper reports on the findings of an extensive survey investigating practising design engineers' perceptions of new product development within the UK medical device industry. The design activity recorded was predominantly the small-scale development of low volume products. Explicit formal procedures were rarely us...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/s1350-4533(96)00021-5
更新日期：1996-12-01 00:00:00
abstract：:Heart rate variability (HRV) is a non-invasive alternative to analyze the role of the autonomic nervous system (ANS) on heart functioning. Many tools have been developed to analyze collected cardiac data. Among them, the Central Tendency Measure (CTM) is a quantitative method for variability analysis of RR intervals. ...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2019.09.024
更新日期：2019-12-01 00:00:00
abstract：:A kinematical model of the lower spine was designed and used to obtain a robust estimation of the vertebral rotations during torso movements from skin-surface markers recorded by video-cameras. Markers were placed in correspondence of the anatomical landmarks of the pelvic bone and vertebral spinous and transverse pro...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2004.08.005
更新日期：2004-12-01 00:00:00
abstract：:A dynamic biomechanical model to determine loads (joint forces) attained at the lumbosacral joint-centre during the stance phase of normal level walking was developed. The biomechanical model was based on rigid free body-segments; namely, the foot, shank, thigh, pelvis and head, arms and trunk (HAT) segments. In this ...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/1350-4533(95)90374-k
更新日期：1995-01-01 00:00:00
abstract：:The spectral analysis of crackles sounds has been carried out based on the assumption that they are stationary signals, and the majority of the work on the crackles was accomplished before the publication of the Computerized Respiratory Sound Analysis (CORSA) guidelines. This works characterizes crackles acquired from...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2012.06.009
更新日期：2013-04-01 00:00:00
abstract：:The pulse pressure waveform has, for long, been known as a fundamental biomedical signal and its analysis is recognized as a non-invasive, simple, and resourceful technique for the assessment of arterial vessels condition observed in several diseases. In the current paper, waveforms from non-invasive optical probe tha...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2014.07.014
更新日期：2014-11-01 00:00:00
abstract：INTRODUCTION:A notable characteristic of bariatric surgery is the frequent manipulation of the bowel. The bowel is large, delicate, flexible, and has a natural lubricant on the tissue surface. Therefore the bowel is difficult to grasp and manipulate. Vacuum technique is commonly used in industry for all types of graspi...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2011.11.014
更新日期：2012-10-01 00:00:00
