Abstract:
:The diagnosis of aseptic loosening of hip implants is often challenging. A vibrational analysis of the bone-implant interface could be an alternative method to analyze the fixation of endoprostheses. We assessed an innovative and new approach for excitation by using extracorporeal shockwaves in this study. In three cadaver specimens total hip arthroplasty was performed bilaterally. Four different states of implant loosening were simulated. Three accelerometers were fixed at the medial condyle, the greater trochanter, and the crest of the ilium. The bone-implant compound was excited with highly standardized extracorporeal shock waves. Resonance spectra between 100 Hz and 5000 Hz were recorded. This technique permitted a good adaptation to varying soft tissue conditions. The main resonance frequency of the hip joints occurred at about 2000 Hz. The analysis of the measured spectra showed an interrelation between the state of loosening and the frequency values of the resonances. In case of a stem loosening, there were significant shifts of the resonance into the lower frequency area between 386 Hz and 847 Hz. With this novel technique the degree of stem loosening could be assessed in a soft tissue considering configuration. This study forms a first step for future establishment of a non-invasive, non-radiological and fast applicable diagnostic procedure for early detection of endoprostheses loosening before manifest presence of clinical signs.
journal_name
Med Eng Physjournal_title
Medical engineering & physicsauthors
Rieger JS,Jaeger S,Kretzer JP,Rupp R,Bitsch RGdoi
10.1016/j.medengphy.2014.11.011subject
Has Abstractpub_date
2015-02-01 00:00:00pages
157-64issue
2eissn
1350-4533issn
1873-4030pii
S1350-4533(14)00299-9journal_volume
37pub_type
杂志文章abstract::Core decompression is the most common procedure for treatment of the early stages of osteonecrosis of the femoral head. The purpose of this study was to compare the biomechanical performance of four different bone graft substitutes combined with core decompression. Subject-specific finite element models generated from...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2016.05.008
更新日期:2016-09-01 00:00:00
abstract::This study presents a theoretical model of the general stress state found in helical implantable leads in bending. The model accurately predicts stress in large filarity coils made from clad wire. The stress is predicted using flexural rigidity of the coil and is developed to include the effects of coil pitch and the ...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/s1350-4533(96)00022-7
更新日期:1997-10-01 00:00:00
abstract::Scoliosis is a 3D deformity of the spine and rib cage. Extensive validation of 3D reconstruction methods of the spine from biplanar radiography has already been published. In this article, we propose a novel method to reconstruct the rib cage, using the same biplanar views as for the 3D reconstruction of the spine, to...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2013.06.002
更新日期:2013-11-01 00:00:00
abstract::The role and effect of preserved antegrade pulmonary blood flow (APBF) at the time of bidirectional cavopulmonary anastomosis (BCPA) in the management of single-ventricle physiology is controversial. We investigated the influence of APBF on the fluid dynamics of BCPA connection using computational fluid dynamics (CFD)...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2008.07.004
更新日期:2009-03-01 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::This article reviews the role of cavitation in the therapeutic applications of ultrasound and laser surgery, and the cavitation effects in mechanical heart valves. Whenever laser pulses are used to ablate or disrupt tissue in a liquid environment, cavitation bubbles are produced which interact with the tissue. The int...
journal_title:Medical engineering & physics
pub_type: 杂志文章,评审
doi:10.1016/j.medengphy.2009.03.007
更新日期:2009-09-01 00:00:00
abstract::Bone-attached robots and microstereotactic frames, intended for deep brain stimulation and minimally invasive cochlear implantation, typically attach to a patient's skull via bone anchors. A rigid and reliable link between such devices and the skull is mandatory in order to fulfill the high accuracy demands of minimal...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2015.02.012
更新日期:2015-05-01 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::We developed a device for an objective measurement of non-nutritive sucking (NNS). NNS is newborns' spontaneous action that is a predictor of their neural system development and can be adopted as an intervention to train oral feeding skills in preterms. Two miniaturized digital pressure sensors were embedded into a co...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2015.12.013
更新日期:2016-04-01 00:00:00
abstract::Using an anaesthetized cat's central footpad pressed against an object as the model of a paralyzed human hand, a nerve signal recording system was developed to measure the effect of a group of consecutive slips between the footpad and the object. Electroneurographic (ENG) activity was recorded using a cuff electrode i...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2007.05.007
更新日期:2008-05-01 00:00:00
abstract::Somatosensory evoked potential (SEP) testing has been widely applied to diagnosis of various neurological disorders. However, SEP recorded using surface electrodes is buried in noises, which makes the signal-to-noise ratio (SNR) very poor. Conventional averaging method usually requires up to thousands of raw SEP input...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2004.09.007
更新日期:2005-04-01 00:00:00
abstract::The rehabilitation engineering community is working towards the development of robotic devices that can assist during gait training of patients suffering from neurologic injuries such as stroke and spinal cord injuries (SCI). The field of robot assisted treadmill training has rapidly evolved during the last decade. Th...
journal_title:Medical engineering & physics
pub_type: 杂志文章,评审
doi:10.1016/j.medengphy.2010.12.010
更新日期:2011-06-01 00:00:00
abstract::Improper design of vertebral body cages may seriously affect the interface strength and cause the lose of fixation for a vertebral body replacement. This research used a FEM-based Taguchi method to investigate the effects of various factors to find the robust design of the body cage. Three-dimensional finite element m...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2008.07.001
更新日期:2009-04-01 00:00:00
abstract::We present a finite element based simulation and analysis method to describe the spatial extent of stimulation and the effects of electrode-tissue interactions in subretinal prostheses. In particular, we estimate the threshold stimulation current needed to depolarise and evoke action potentials in the ganglion cells t...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2011.01.015
更新日期:2011-07-01 00:00:00
abstract::Investigations focused on the gait and physiological limits of human speed have been on-going for more than a century. However, due to measurement limitation a kinetic understanding of the foot-ground collision and how these dynamics differ between individuals to confer speed and limit gait has only recently begun to ...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2015.04.009
更新日期:2015-09-01 00:00:00
abstract::We observed an anomaly in the human electroencephalogram (EEG) associated with exposure to terrestrial trunked radio (TETRA) Radiofrequency Fields (RF). Here, we characterize the time and frequency components of the anomaly and demonstrate that it is an artefact caused by TETRA RF interfering with the EEG recording eq...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2013.04.009
更新日期:2013-11-01 00:00:00
abstract::Understanding the load mechanics of orthopaedic implants is important to be able to predict their behaviour in-vivo. Much research, both mechanical and clinical, has been carried out on hip and knee implants, but less has been written about the mechanics of wrist implants. In this paper, the load mechanics of the Univ...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2016.02.008
更新日期:2016-06-01 00:00:00
abstract::Fetal movement is one index of fetal well-being. We designed and built a new recorder based on fetal movement acceleration measurement (FMAM). The FMAM recorder has a newly developed, capacitive acceleration sensor that can detect the oscillations of the maternal abdominal wall caused by fetal movements. In this study...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2011.09.001
更新日期:2012-06-01 00:00:00
abstract::A method for leakage effect reduction by a modification of the classical spectra obtained Discrete Fourier Transform is proposed. The properties of the new method are investigated analytically and validated through synthesized signals, processed by the developed complete computational procedure. This combines the prop...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/s1350-4533(97)00006-4
更新日期:1997-07-01 00:00:00
abstract::We developed an analytical biomechanical model for leg-extension equipment and the associated knee-extension/flexion exercises. The shear component, phi(t), of the tibiofemoral joint load was calculated taking into account all the fundamental elements of the equipment mechanics (resistance pad placement, cam/pulley sy...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2007.12.012
更新日期:2008-10-01 00:00:00
abstract::Cutting and drilling operations in bone are involved in many orthopedic and otolaryngological surgeries. The temperature elevation of these procedures is potentially harmful to bone and soft tissue cells. The research on this topic aims therefore at minimizing temperature elevation and finding optimal process paramete...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2016.06.019
更新日期:2016-10-01 00:00:00
abstract::Inserting the distal locking screws is a challenging step of the intramedullary nailing procedures due to the nail deformation that makes the proximally mounted targeting systems ineffective. A pre-planning methodology is proposed, based on an analytical model of the nail-bone construct, to predict the nail deformatio...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2019.09.012
更新日期:2019-12-01 00:00:00
abstract::The femoral head in subjects with leg calve perthes disease (LCPD) is generally considerably deformed. It is debatable whether this deformation is due to an increase in applied loads, a decrease in bone mineral density or a change in containment of articular surfaces. The aim of this study was to determine the influen...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2016.10.015
更新日期:2017-02-01 00:00:00
abstract::Terahertz pulsed imaging is a spectroscopic imaging modality using pulses of electromagnetic radiation (100 GHz-10 THz), and there has been recent interest in studying biomedical specimens. It is usual to display parametric images derived from the measured pulses. In this work, classification was achieved by applying ...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2004.02.011
更新日期:2004-06-01 00:00:00
abstract::In this study, we applied multi-channel mechanomyographic (MMG) recordings in combination with linear and nonlinear analyses to investigate muscular and musculotendinous effects of high intensity eccentric exercise. Twelve accelerometers arranged in a 3 × 4 matrix over the dominant elbow muscles were used to detect MM...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2014.09.003
更新日期:2014-12-01 00:00:00
abstract::Middle cerebral arterial blood velocity (MCAv) response to spontaneous and manipulated changes of arterial blood pressure (ABP) was studied in eight subjects using a linear autoregressive with exogenous input (ARX) model. ABP and MCAv were measured non-invasively by photoplethysmograph and transcranial Doppler ultraso...
journal_title:Medical engineering & physics
pub_type: 临床试验,杂志文章
doi:10.1016/s1350-4533(03)00015-8
更新日期:2003-10-01 00:00:00
abstract::Measurement of accurate in vivo hip joint kinematics in 6-DOF is difficult. Few studies have reported non-invasive measurements of the hip kinematics. The objective of this study was to validate a non-invasive dual fluoroscopic imaging system (DFIS) for measurement of hip kinematics. Bi-lateral hip joints of a cadaver...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2012.10.004
更新日期:2013-03-01 00:00:00
abstract::We attempted to distinguish walking on level ground from walking on a stairway using waist acceleration signals. A triaxial accelerometer was fixed to the subject's waist and the three acceleration signals were recorded by a portable data logger at a sampling rate of 256 Hz. Twenty healthy male subjects were asked to ...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/s1350-4533(00)00041-2
更新日期:2000-05-01 00:00:00
abstract::Acetabular fractures potentially account for up to half of all pelvic fractures, while pelvic fractures potentially account for over one-tenth of all human bone fractures. This is the first biomechanical study to assess acetabular fracture fixation using plates versus cables in the presence of a total hip arthroplasty...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2017.06.004
更新日期:2017-08-01 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