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Biomechanical comparison of locking plate and crossing metallic and absorbable screws fixations for intra-articular calcaneal fractures

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Science china(Life Sciences) 2016年第9期59卷 958-964页

作者： Ming Ni duo wai-chi wong Jiong Mei Wenxin Niu Ming Zhang Tongji Hospital Tongji University School of Medicine Shanghai 200065 China Pudong New Area People's Hospital Shanghai 201299 China Interdisciplinary Division of Biomedical Engineering The Hong Kong Polytechnic University Hong Kong SAR China Shanghai Yangzhi Rehabilitation Hospital (Shanghai Sunshine Rehabilitation Center) Shanghai 201619 China

The locking plate and percutaneous crossing metallic screws and crossing absorbable screws have been used clinically to treat intra-articular calcaneal fractures, but little is known about the biomechanical differences between them. This study compared the biomechanical stability of calcaneal fractures fixed using a locking plate and crossing screws. Three-dimensional finite-element models of intact and fractured calcanei were developed based on the CT images of a cadaveric sample. Surgeries were simulated on models of Sanders type III calcaneal fractures to produce accurate postoperative models fixed by the three implants. A vertical force was applied to the superior surface of the subtalar joint to simulate the stance phase of a walking gait. This model was validated by an in vitro experiment using the same calcaneal sample. The intact calcaneus showed greater stiffness than the fixation models. Of the three fixations, the locking plate produced the greatest stiffness and the highest von Mises stress peak. The micromotion of the fracture fixated with the locking plate was similar to that of the fracture fixated with the metallic screws but smaller than that fixated with the absorbable screws. Fixation with both plate and crossing screws can be used to treat intra-articular calcaneal fractures. In general, fixation with crossing metallic screws is preferable because it provides sufficient stability with less stress shielding.

关键词： finite-element analysis in vitro experiment calcaneal fracture plate fixation absorbable screw biomechanics

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Influence of screw length and diameter on tibial strain energy density distribution after anterior cruciate ligament reconstruction

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Acta Mechanica Sinica 2014年第2期30卷 241-249页

作者： Jie Yao Guan-Ming Kuang duo wai-chi wong Wen-Xin Niu Ming Zhang Yu-Bo Fan Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education School of Biological Science and Medical Engineering/National Key Lab of Virtual Reality TechnologyBeihang University Interdisciplinary Division of Biomedical Engineering Faculty of EngineeringThe Hong Kong Polytechnic University Shenzhen Key Laboratory for Innovative Technology in Orthopaedic Trauma Department of Orthopaedics and TraumatologyThe University of Hong Kong-Shenzhen Hospital The University of Hong Kong Tongji University School of Medicine

Postoperative tunnel enlargement has been frequently reported after anterior cruciate ligament（ACL）*** screw,as a surgical implant in ACL reconstruction,may influence natural loading transmission and contribute to tunnel *** aims of this study are（1）to quantify the alteration of strain energy density（SED）distribution after the anatomic single-bundle ACL reconstruction;and（2）to characterize the influence of screw length and diameter on the degree of the SED alteration.A validated finite element model of human knee joint was *** screw length ranging from 20 to 30 mm with screw diameter ranging from 7 to 9 mm were *** the post-operative knee,the SED increased steeply at the extra-articular tunnel aperture under compressive and complex loadings,whereas the SED decreased beneath the screw shaft and nearby the intra-articular tunnel *** the screw length could lower the SED deprivation in the proximal part of the bone tunnel;whereas increasing either screw length or diameter could aggravate the SED deprivation in the distal part of the bone *** the elastic modulus of the screw could lower the bone SED deprivation around the *** consideration of both graft stability and SED alteration,a biodegradable interference screw with a long length is recommended,which could provide a beneficial mechanical environment at the distal part of the tunnel,and meanwhile decrease the bone-graft motion and synovial fluid propagation at the proximal part of the *** findings together with the clinical and histological factors could help to improve surgical outcome,and serve as a preliminary knowledge for the following study of biodegradable interference screw.

关键词： Anterior crucial ligament reconstruction Strain energy density Screw length Screw diameter

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Changes in segment coordination variability and the impacts of the lower limb across running mileages in half marathons:Implications for running injuries

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Journal of Sport and Health Science 2022年第1期11卷 67-74页

作者： Tony Lin-Wei Chen duo wai-chi wong Yan Wang Qitao Tan Wing-Kai Lam Ming Zhang Department of Biomedical Engineering Faculty of EngineeringHong Kong Polytechnic UniversityHong Kong SAR 999077China Li Ning Sports Science Research Center Li Ning(China)Sports Goods Co.LtdBeijing 101111China Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518057China Department of Kinesiology Shenyang Sports InstituteShenyang 110102China

Background:Segment coordination variability(CV)is a movement pattern associated with running-related *** can also be adversely affected by a prolonged ***,research on this topic is currently *** purpose of this study was to investigate the effects of a prolonged run on segment CV and vertical loading rates during a treadmill half ***:Fifteen healthy runners ran a half marathon on an instrumental treadmill in a biomechanical *** kinematic and kinetic data were collected every 2 km(from 2 km until 20 km),and the data were processed by musculoskeletal *** CVs were computed from the angle-angle plots of selected pelvis-thigh,thigh-shank,and shank-rearfoot couplings using a modified vector coding *** loading rate of vertical ground reaction force was also calculated.A one-way MANOVA with repeated measures was performed on each of the outcome variables to examine the main effect of running ***:Significant effects of running mileage were found on segment CVs(p≤0.010)but not on loading rate(p=0.881).Notably,during the early stance phase,the CV of pelvis frontal thigh frontal was significantly increased at 20 km compared with the CV at 8 km(g=0.59,p=0.022).The CV of shank transverse *** frontal decreased from 2 km to 8 km(g=0.30,p=0.020)but then significantly increased at both 18 km(g=0.05,p<0.001)and 20 km(g=0.36,p<0.001).Conclusion:At the early stance,runners maintained stable CVs on the sagittal plane,which could explain the unchanged loading rate throughout the half ***,increased CVs on the frontal/transverse plane may be an early sign of fatigue and indicative of possible injury *** studies are necessary for conclusive statements in this regard.

关键词： Coupling angle Endurance running Motion capture analysis Musculoskeletal modeling Vector coding technique

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X-reality for phantom limb management for amputees:A systematic review and meta-analysis

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Engineered Regeneration 2023年第2期4卷 134-151页

作者： James Chung-wai Cheung Daphne Sze Ki Cheung Ming Ni Kam-wai Chen Ye-Jiao Mao Lin Feng Wing-Kai Lam duo wai-chi wong Aaron Kam-Lun Leung Department of Biomedical Engineering Faculty of EngineeringThe Hong Kong Polytechnic UniversityHong KongChina School of Nursing The Hong Kong Polytechnic UniversityHong KongChina Department of Orthopaedics Ruijin HospitalShanghai Jiao Tong UniversityShanghaiChina Department of Prosthetics and Orthotics Queen Mary HospitalHong KongChina Sports Information and External Affairs Centre Hong Kong Sports InstituteHong KongChina Research Institute for Sports Science and Technology The Hong Kong Polytechnic UniversityHong KongChina Department of Rehabilitation Science The Hong Kong Polytechnic UniversityHong KongChina

Phantom limb is a disabling neuropsychiatric condition among amputees resulting in pain and disturbance that impact their functions,quality of life,and *** pharmacological approaches appeared to be ineffec-tive,the emergence and integration of X-reality,including virtual reality,augmented reality,and mixed reality,might elevate the effectiveness of mirror therapy in managing phantom *** objective of this study is to review X-reality for managing phantom pain.A systematic search was conducted on PubMed,Scopus,Web of Science,PsycINFO,Embase,and ***(n=16)studies containing 66 lower-limb and 53 upper-limb amputees were included for the review over the thematic framework of amputee characteristics and intervention designs,while thirteen(n=13)studies were further proceeded for the *** found eleven studies on virtual reality(n=11),four studies on marker-based augmented reality(n=4)and one study on mixed reality(n=1)with a total of 40 game/task themes involving,motor skills,motor control,and ***,all these interventions adopted the movement representation strategies with different ***,the X-reality interventions reduced the pain level of the amputees(mean difference:-2.30,95%CI,-3.38 to-1.22),especially the virtual reality subgroup(mean difference:-2.83,95%CI,-4.43 to-1.22).However,there were substantial heterogeneity and partially explained by the subgroup analysis on publication *** strength of evidence was limited by case reports and case series in this review.

关键词： Extended reality Limb telescoping Phantom pain Phantom sensation

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Virtual reality based multiple life skill training for intellectual disability:A multicenter randomized controlled trial

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Engineered Regeneration 2022年第2期3卷 121-130页

作者： James Chung-wai Cheung Ming Ni Andy Yiu-Chau Tam Tim Tin-Chun Chan Alyssa Ka-Yan Cheung Ocean Yu-Hong Tsang chi-Bun Yip Wing-Kai Lam duo wai-chi wong Department of Biomedical Engineering Faculty of EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China Research Institute for Smart Ageing The Hong Kong Polytechnic UniversityHong Kong 999077China Jockey Club Smart Ageing Hub Department of Biomedical EngineeringFaculty of EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China Department of Orthopaedics Pudong New Area People’s Hospital Affiliated to Shanghai Jiaotong UniversityShanghai 201299China Social Service Department Yan Chai HospitalHong Kong 999077China C2 Innovations and Research Limited Hong Kong 999077China Department of Kinesiology Shenyang Sport UniversityShenyang 110102China Sports Information and External Affairs Centre Hong Kong Sports InstituteHong Kong 999077China

Life skill-based training is essential for intellectual disabled individuals to regain autonomy and social *** reality(VR)could deliver a nascent application that is more engaging and *** objective of this study was to evaluate the training effects of the VR-based multiple life skill training program on life skill perfor-mance,self-efficacy,memory,cognitive and behavioral functions via a multicenter randomized controlled trial.A total of 145 intellectual disabled participants were recruited for a randomized controlled trial with three in-tervention arms:VR(n=42);traditional(n=53);and control(n=50).The life skill tasks for the interventions included 1)grocery shopping,2)cooking,and 3)kitchen *** measures were performance scores for the three tasks,self-efficacy scale,digit span score,and Frontal Assessment Battery score,graded by blinded ***-after effects of each group were evaluated using separated Wilcoxon Signed-rank *** sig-nificantly improved cooking,cleaning performance,and memory span,while traditional training significantly improved shopping,cooking,and cleaning *** generalized estimating equation evaluated effects between groups adjusted for age,gender and intelligence quotient(IQ).VR had significantly larger improvement effects in cooking and cleaning than the control group and memory span compared to traditional training and controls *** appeared to be a significant confounder on the training *** work may consider developing artificial intelligence to customize programs depending on IQ level.

关键词： Mental retardation Intellectual development X-reality Immersive rehabilitation Metaverse

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Computational models of flatfoot with three-dimensional fascia and bulk soft tissue interaction for orthosis design

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Medicine in Novel Technology and Devices 2021年第1期9卷 18-25页

作者： Yinghu Peng duo wai-chi wong Yan Wang Tony Lin-Wei Chen Guoxin Zhang Fei Yan Ming Zhang The Hong Kong Polytechnic University Shenzhen Research Institute ShenzhenChina Department of Biomedical Engineering Faculty of EngineeringThe Hong Kong Polytechnic UniversityHong KongChina

The finite element(FE)method has been widely used to investigate the internal force of plantar fascia,which could reveal the relationship between plantar fascia dysfunction and flatfoot deformity during weight-bearing ***,for most foot FE models,plantar fascia utilized truss elements or three-dimensional geometry that did not consider the interaction between plantar fascia and bulk soft *** configurations could ignore the impact of superoinferior loading induced by arch support and underestimate the plantar fascia *** study aims to investigate how the fascia-bulk soft tissue interaction affects the internal foot biomechanics in the flatfoot FE analysis with a three-dimensional plantar fascia model,which included both fascia-bone and fascia-bulk soft tissue interactions(3DBPT).To evaluate the effect of fascia-bulk soft tissue interaction on internal foot mechanics,this study compared the 3DBPT model with the other two plantar fascia models,including linear fascia(BPL)and three-dimensional plantar fascia without fascia-bulk soft tissue interaction(3DBP).The predicted foot contact pressure in the 3DBPT model was compared with the measured value obtained by the F-Scan pressure measurement system in balanced *** von Mises stresses in the plantar fascia and foot ligaments were *** stress of the plantar fascia in the 3DBPT model was higher than that of *** the 3DBPT model,the superoinferior loading exerted on the bulk soft tissue could be directly transferred to the plantar *** proposed model,including the plantar fascia and bulk soft tissue interaction,could reveal relatively reliable plantar fascia loading in flatfoot deformity,thereby contributing to the development of orthotic designs for the flatfoot deformity.

关键词： Plantar fascia Foot-ankle complex Flatfoot Biomechanics Finite element analysis

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The interaction effects of rocker angle and apex location in rocker shoe design on foot biomechanics and Achilles tendon loading

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Medicine in Novel Technology and Devices 2022年第1期13卷 96-101页

作者： Tony Lin-Wei Chen duo wai-chi wong Yinghu Peng Yan Wang Ivy Kwan-Kei wong Tsz-Kit Lam Wing-Kai Lam Ming Zhang Department of Biomedical Engineering Faculty of EngineeringThe Hong Kong Polytechnic UniversityHong Kong The Hong Kong Polytechnic University Shenzhen Research Institute ShenzhenChina Li Ning Sports Science Research Center Li Ning(China)Sports Goods Co.LtdBeijingChina Department of Kinesiology Shenyang Sports InstituteShenyangChina

The influences of rocker shoes on foot biomechanics were controversial because the interaction between two design factors—rocker angle and apex location,was usually *** study investigated the interaction effects of rocker angle and apex location on plantar foot pressure,metatarsophalangeal/ankle angle,and Achilles tendon force during *** participants performed walking trials under six rocker shoe conditions:2 rocker angles(mild and severe)×3 apex locations(distal,standard,and proximal),wherein the plantar foot pressure was measured and the movement data were processed by musculoskeletal modeling to report joint angle and Achilles tendon force.A two-way ANOVA repeated measures was used for *** interaction effects were reported in examinations of forefoot pressure,midfoot pressure,and metatarsophalangeal *** standard apex significantly reduced peak forefoot and midfoot pressures(p=0.008–0.034,Hedges'g=0.75–0.84),which was further decreased by a severe rocker angle(p=0.006,Hedges'g=0.51–0.81).Moving the apex proximally reduced Achilles tendon forces(pchilles tendon *** concluded that apex location was likely the dominant design factor of the rocker sole in influencing foot biomechanics,yet its interactions with rocker angle should be *** configuration of the two features could be varied to possess different therapeutic merits and adapt to specific application purposes.

关键词： Gait Rocker shoe Biomechanics Computer simulation Plantar pressure

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Augmented reality(AR)and fracture mapping model on middle-aged femoral neck fracture:A proof-of-concept towards interactive visualization

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Medicine in Novel Technology and Devices 2022年第4期16卷 350-355页

作者： Yong-Qin Wang Peng-Fei Li Zi-Huan Xu Ying-Qi Zhang Qua-Na Lee James Chung-wai Cheung Ming Ni duo wai-chi wong School of Health Science and Engineering University of Shanghai for Science and TechnologyShanghai200093China Department of Orthopaedics Pudong New Area People's HospitalShanghai201299China Department of Orthopaedics Tongji Hospital Affiliated to Tongji UniversityShanghai200065China School of Humanities and Social Sciences Beihang UniversityBeijingChina Department of Biomedical Engineering Faculty of EngineeringThe Hong Kong Polytechnic UniversityHong Kong999077China Department of Orthopaedics Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai200025China

A thorough understanding of the fracture characteristics can assist the decision-making process for *** study aimed to characterize the femoral neck fractures among middle-aged patients and illustrated a biomedical visualization method using a fracture mapping model and augmented *** collected plain radiography and computed tomography(CT)data from 156 adult patients with a femoral neck *** descriptive study showed that Type I and Type II fractures accounted for 8(5%)and 64(41%)*** comparison,Type IV fractures accounted for 44(28%)and 40(25%)cases according to the Garden *** fractures and cortical defects were identified in 14.74%and 29.49%of the cases.A fracture mapping model was reconstructed based on the CT data and demonstrated the location and distribution of the major fracture lines surrounding the head-neck *** also illustrated the application of augmented reality technology to visualize and interact with the patient-specific fracture model and the fracture mapping model that facilitated education,training,and surgical *** studies may consider mapping other biomechanical data,such as joint loading and stress distribution,and exploring artificial intelligence via deep reinforcement learning for computer-aided fracture reduction and procedure planning.

关键词： Biomedical visualization Fracture pattern Fracture characteristics Virtual reality X-reality Surgical navigation Digital medicine

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An instrument for methodological quality assessment of single-subject finite element analysis used in computational orthopaedics

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Medicine in Novel Technology and Devices 2021年第3期11卷 113-119页

作者： duo wai-chi wong Tony Lin-Wei Chen Yinghu Peng Wing-Kai Lam Yan Wang Ming Ni Wenxin Niu Ming Zhang Department of Biomedical Engineering Faculty of EngineeringThe Hong Kong Polytechnic UniversityHong KongChina The Hong Kong Polytechnic University Shenzhen Research Institute ShenzhenChina Guangdong Provincial Engineering Technology Research Center for Sports Assistive Devices Guangzhou Sport UniversityGuangzhouChina Department of Kinesiology Shenyang Sport UniversityShenyangChina Li Ning Sports Science Research Center Li Ning(China)Sports Goods CompanyBeijingChina Department of Orthopaedics Pudong New Area Peoples’Hospital Affiliated to Shanghai University of Medicine and Health SciencesShanghaiChina Department of Rehabilitation Medical College of Tongji UniversityShanghaiChina

The methodological quality of subject-specific finite element analysis papers depends on the rigor of the study design and detailed description of key elements,while assessment instruments are often confined to clinical trials or *** study aims to present an instrument for methodological quality assessment of singlesubject finite element analysis used in computational orthopaedics(MQSSFE).Based upon existing instruments and relevant review papers,a pilot version was developed consisting of 37 items with 6 domains,including study design and presentation of findings,subject recruitment,model reconstruction and configuration,boundary and loading conditions(simulation),model verification and validation,and model assumption and *** interviewed four experts in the field to assess the face validity and refined the *** instrument was tested for interrater reliability among two assessors on nine finite element study ***,the criterion validity was evaluated by comparing the similarity of the MQSSFE and the modified Down and Black *** intraclass correlation coefficient was 0.965,while the MQSSFE was significantly moderately correlated with the modified Down and Black instruments(r=0.61).We believed that MQSSFE was adequately appropriate,reliable,and valid for assessing the methodological quality for finite element studies used in computational *** instrument could facilitate quality assessment in the systematic reviews of finite element models and checklists for fidelity.

关键词： Finite element model Simulation Validation and verification Mesh convergence Uncertainty analysis

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Dual ultra-wideband(UWB)radar-based sleep posture recognition system:Towards ubiquitous sleep monitoring

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Engineered Regeneration 2023年第1期4卷 36-43页

作者： Derek Ka-Hei Lai Li-Wen Zha Tommy Yau-Nam Leung Andy Yiu-Chau Tam Bryan Pak-Hei So Hyo-Jung Lim Daphne Sze Ki Cheung duo wai-chi wong James Chung-wai Cheung Department of Biomedical Engineering Faculty of EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China Department of Bioengineering Imperial CollegeLondon SW72AZUnited Kingdom Research Institute of Smart Ageing The Hong Kong Polytechnic UniversityHong KongChina School of Nursing The Hong Kong Polytechnic UniversityHong KongChina

Sleep posture monitoring is an essential assessment for obstructive sleep apnea(OSA)*** objective of this study is to develop a machine learning-based sleep posture recognition system using a dual ultra-wideband radar *** collected radiofrequency data from two radars positioned over and at the side of the bed for 16 patients performing four sleep postures(supine,left and right lateral,and prone).We proposed and evaluated deep learning approaches that streamlined feature extraction and classification,and the traditional machine learning approaches that involved different combinations of feature extractors and *** results showed that the dual radar system performed better than either single *** statistical features with random forest classifier yielded the best accuracy(0.887),which could be further improved via an ablation study(0.938).Deep learning approach using transformer yielded accuracy of 0.713.

关键词： Obstructive sleep apnea Deep learning Sleep monitoring Feature extraction Ablation study

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