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https://www.readbyqxmd.com/read/28227887/hip-joint-geometry-effects-on-cartilage-contact-stresses-during-a-gait-cycle
#1
Hui-Hui Wu, Dong Wang, An-Bang Ma, Dong-Yun Gu, Hui-Hui Wu, Dong Wang, An-Bang Ma, Dong-Yun Gu, An-Bang Ma, Dong-Yun Gu, Hui-Hui Wu, Dong Wang
The cartilage surface geometry of natural human hip joint is commonly regarded as sphere. It has been widely applied in computational simulation and hip joint prosthesis design. Some new geometry models have been developed and the sphere assumption has been questioned recently. The objective of this study was to analyze joint geometry effects on cartilage contact stress distribution and investigate contact patterns during a whole gait cycle. Hip surface was reconstructed from CT data of a healthy volunteer...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227828/pose-measurement-of-anterior-pelvic-plane-based-on-inertial-measurement-unit-in-total-hip-replacement-surgeries
#2
Zhe Cao, Shaojie Su, Hong Chen, Hao Tang, Yixin Zhou, Zhihua Wang, Zhe Cao, Shaojie Su, Hong Chen, Hao Tang, Yixin Zhou, Zhihua Wang, Zhe Cao, Yixin Zhou, Hong Chen, Zhihua Wang, Hao Tang, Shaojie Su
In Total Hip Replacement (THR), inaccurate measurement of Anterior Pelvic Plane (APP), which is usually used as a reference plane, will lead to malposition of the acetabular prosthesis. As a result, the risk of impingement, dislocation and wear will increase and the safe range of motion will be limited. In order to acquire the accurate pose of APP, a measurement system is designed in this paper, which includes two parts: one is used to estimate the initial pose of APP and the other is used to trail dynamic motion of APP...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226518/frequency-of-occurrence-of-myoelectric-patterns-to-evaluate-gait-motor-control-strategies-after-hip-replacement-surgery
#3
Valentina Agostini, Francesco Di Nardo, Sandro Fioretti, Laura Burattini, Samanta Rosati, Gabriella Balestra, Marco Knaflitz, Valentina Agostini, Francesco Di Nardo, Sandro Fioretti, Laura Burattini, Samanta Rosati, Gabriella Balestra, Marco Knaflitz, Samanta Rosati, Sandro Fioretti, Gabriella Balestra, Valentina Agostini, Laura Burattini, Marco Knaflitz, Francesco Di Nardo
Gait alterations are observed even years after hip replacement surgery. Such long-lasting alterations may arise from a global change of the motor control strategies. The aim of this work is to investigate the changes in gait motor control strategies of patients after hip replacement surgery by analyzing the frequency of occurrence (OF) of myoelectric activation patterns. We studied five lower limb muscles during gait, in hip prosthesis patients and controls. We found that patients adopt a motor control strategy that tends to prefer "simplified" myoelectric patterns, showing a smaller number of activations within the gait cycle...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28223094/a-decade-of-the-catalonian-arthroplasty-register-racat-variability-exhaustivity-and-survival-of-prostheses-between-2005-and-2014
#4
J Arias-de la Torre, A Capdevila, O Martínez, L Domingo, M Marinelli, N Robles, J Nardi, L Puig-Verdié, F Pallisó, M Espallargues
BACKGROUND AND AIM: The Catalonian Arthroplasty Register (RACat) is a public health-based population register used to analyse and evaluate hip and knee replacements in Catalonia. The aim of this study is to present the outcomes after 10 years in operation (January 2005-December 2014). METHODOLOGY: Using the information from the RACat and the minimum basic data set at hospital discharge, an analysis was made of the quality and exhaustivity of the data, as well as a descriptive analysis of the patients, prostheses, and care process...
February 17, 2017: Revista Española de Cirugía Ortopédica y Traumatología
https://www.readbyqxmd.com/read/28204856/ultrasound-findings-in-asymptomatic-patients-with-modular-metal-on-metal-total-hip-arthroplasty
#5
Nicholas B Frisch, Nolan M Wessell, Kevin Taliaferro, Marnix Van Holsbeeck, Craig D Silverton
OBJECTIVE: The use of metal-on-metal and modular total hip arthroplasty is associated with potentially serious local and systemic complications. The primary aim of this study was to identify the prevalence of a pseudotumor in asymptomatic patients with a particular metal-on-metal hip prosthesis after a minimum follow-up of 5 years using ultrasound evaluation. A secondary purpose was to identify associations between the presence of pseudotumor and serum metal ion levels following implantation...
February 15, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28198543/deformation-of-the-zurich-cementless-acetabular-cup-caused-by-implantation-in-a-canine-cadaver-model
#6
Geoffrey D Panjeton, Stanley E Kim, Kelvin Chang, Lindsey S Palm, Peter G Ifju
OBJECTIVE: To evaluate the change in geometry of the Zurich total hip arthroplasty (THA) acetabular component after implantation. ANIMALS: Hemipelves from adult mix-breed dogs weighing between 20 and 25 kg. METHODS: Digital image correlation imaging was performed prior to, immediately after, and 24 hours after impaction of Zurich THA acetabular component, and after removal of the cup from the specimen. Patterns of deformation were qualitatively described, and maximal deformations were compared between time points...
February 15, 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/28197752/surgical-dislocation-for-pediatric-and-adolescent-hip-deformity-clinical-and-radiographical-results-at-3%C3%A2-years-follow-up
#7
Nicola Guindani, Oliver Eberhardt, Thomas Wirth, Michele F Surace, Francisco F Fernandez
INTRODUCTION: The aim of this study is to evaluate the clinical, radiographic short-term results and complications after surgical hip dislocation in young patients (≤18 years). MATERIALS AND METHODS: Clinical and radiographic outcomes were assessed in patients who underwent a surgical hip dislocation Ganz-type approach between 2008 and 2012. Diagnosis included Legg-Calvé-Perthes disease, slipped capital femoral epiphysis, femoroacetabular impingement, osteonecrosis of the femoral head, multiple hereditary exostoses and pigmented villonodular synovitis...
February 14, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28176355/strain-shielding-inspired-re-design-of-proximal-femoral-stems-for-total-hip-arthroplasty
#8
Myriam Cilla, Sara Checa, Georg N Duda
A large number of hip prosthesis with different designs have been developed. However, the influence of hip implant design changes on the strains induced in the bone remains unclear. The purpose of this study is to better understand the mechanics of short stem total hip arthroplasty. Specifically, it investigates whether strain shielding can be avoided by changing implant shape and/or material properties. It is hypothesized that the re-design of existing implant designs can result in further reduction of strain shielding and thus keep bone loss minimal following total hip replacement...
February 8, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28169450/quantitating-the-effect-of-prosthesis-design-on-femoral-remodeling-using-high-resolution-region-free-densitometric-analysis-dxa-rfa
#9
Mohsen Farzi, Richard M Morris, Jeannette Penny, Lang Yang, Jose M Pozo, Søren Overgaard, Alejandro F Frangi, J Mark Wilkinson
Dual energy X-ray absorptiometry (DXA) is the reference standard method used to study bone mineral density (BMD) after total hip arthroplasty (THA). However, the subtle, spatially-complex changes in bone mass due to strain-adaptive bone remodeling relevant to different prosthesis designs are not readily resolved using conventional DXA analysis. DXA region free analysis (DXA RFA) is a novel computational image analysis technique that provides a high-resolution quantitation of periprosthetic BMD. Here we applied the technique to quantitate the magnitude and areal size of periprosthetic BMD changes using scans acquired during two previous randomized clinical trials (2004 to 2009); one comparing three cemented prosthesis design geometries, and the other comparing a hip resurfacing versus a conventional cementless prosthesis...
February 7, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28167881/poor-prognosis-of-patients-treated-for-periprosthetic-joint-infection
#10
REVIEW
Cynthia A Kahlenberg, Alexia Hernandez-Soria, Michael B Cross
The study by Gomez et al., "The Fate of Spacers in the Treatment of Periprosthetic Joint Infection," evaluates the clinical course and success rate of treatment of periprosthetic joint infection with two-stage revision with spacer placement in the interim period. The current review critically analyzes the findings of this study and examines how these findings may influence patient care in the field of hip and knee replacement. Gomez et al. report sobering results of two-stage revision with spacer placement for periprosthetic joint infection...
February 2017: HSS Journal: the Musculoskeletal Journal of Hospital for Special Surgery
https://www.readbyqxmd.com/read/28167248/agreement-between-pre-operative-and-intra-operative-bacteriological-samples-in-85-chronic-peri-prosthetic-infections
#11
Valérie Matter-Parrat, Cécile Ronde-Oustau, Cyril Boéri, Jeannot Gaudias, Jean-Yves Jenny
BACKGROUND: Whether pre-operative microbiological sampling contributes to the management of chronic peri-prosthetic infection remains controversial. We assessed agreement between the results of pre-operative and intra-operative samples in patients undergoing single-stage prosthesis exchange to treat chronic peri-prosthetic infection. HYPOTHESIS: Agreement between pre-operative and intra-operative samples exceeds 75% in patients undergoing single-stage exchange of a hip or knee prosthesis to treat chronic peri-prosthetic infection...
February 3, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28166057/proton-therapy-of-prostate-cancer-by-anterior-oblique-beams-implications-of-setup-and-anatomy-variations
#12
M Moteabbed, A Trofimov, G C Sharp, Y Wang, A L Zietman, J A Efstathiou, H-M Lu
Proton therapy of prostate by anterior beams could offer an attractive option for treating patients with hip prosthesis and limiting the high-dose exposure to the rectum. We investigated the impact of setup and anatomy variations on the anterior-oblique (AO) proton plan dose, and strategies to manage these effects via range verification and adaptive delivery. Ten patients treated by bilateral (BL) passive-scattering proton therapy (79.2 Gy in 44 fractions) who underwent weekly verification CT scans were selected...
March 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28165587/femoral-impaction-allografting-for-significant-bone-loss-in-revision-hip-arthroplasty
#13
Thomas A J Goff, Peter Bobak
INTRODUCTION: Femoral impaction bone allografting in revision hip arthroplasty facilitates physiological reconstruction with restoration of bone stock, allowing implantation of a standard cemented femoral component. The purpose of this study was to report our experience in femoral component revision arthroplasty with impaction morsellised cancellous bone allograft using custom impactors and a cemented triple-taper polished stem. METHODS: Retrospective analysis of all cases of femoral component revision hip arthroplasty with impaction bone grafting undertaken by a single surgeon from 2005 to 2011...
February 1, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/28164068/fracture-diaphyseal-femur-in-a-case-of-ipsilateral-excision-arthroplasty-of-hip-report-of-two-cases-with-description-of-an-unusual-injury-pattern-mechanism-and-clinical-decision-making-in-management
#14
Kunal Shah, Tushar Ubale, Rahematullah Abdul, Vaibhav Kasodekar, Ashish Assudani, Kiran Makwana
INTRODUCTION: Although fracture diaphyseal femur is commonly seen in orthopedic practice, its association with ipsilateral resection arthroplasty of hip/pseudarthrosis of neck is rare. The technique of excision arthroplasty has undergone modification with emphasis on preserving as much bone as possible. However, it is not always possible to preserve bone while removing the earlier prosthesis and cement. This often leads to extensive proximal bone loss. Associated ipsilateral fracture femur presents a unique scenario...
September 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28164053/long-term-bisphosphonate-therapy-induced-periprosthetic-femoral-stress-fracture-in-a-sliding-hip-screw-implant-a-unique-case-report
#15
Mark R Adams, Conor Dunn, Michael S Sirkin, Mark C Reilly
INTRODUCTION: Long-term bisphosphonate therapy for osteoporosis is associated with an increased risk of low-to-no energy atypical subtrochanteric and femoral shaft fractures with characteristic radiologic findings. There are few reports of patients with long-term bisphosphonate-induced periprosthetic fractures, all of them had a hip arthroplasty prosthesis. In this report, we present a unique case of a 90-year-old Caucasian female on long-term bisphosphonate therapy with a sliding hip screw implant who sustained a periprosthetic fracture of the femoral shaft at the distal aspect of the plate...
September 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28159557/rates-of-hip-and-knee-joint-replacement-amongst-different-ethnic-groups-in-england-an-analysis-of-national-joint-registry-data
#16
Michèle C Smith, Yoav Ben-Shlomo, Paul Dieppe, Andrew D Beswick, J Mark Wilkinson, Ashley W Blom
OBJECTIVE: Despite a health care system that is free at the point of delivery, ethnic minorities may not always get care equitable to that of White patients in England. We examined whether ethnic differences exist in joint replacement rates and surgical practice in England. DESIGN: 373,613 hip and 428,936 knee National Joint Registry primary replacement patients had coded ethnicity in Hospital Episode Statistics. Age and gender adjusted observed/expected ratios of hip and knee replacements amongst ethnic groups were compared using indirect standardisation...
January 31, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28157085/surgical-strategy-in-intra-pelvic-cup-migration-during-total-hip-arthroplasty-a-case-study
#17
Andrzej Pozowski, Mateusz Kowal, Jadwiga Kuciel Lewandowska, Małgorzata Paprocka Borowicz
We report the case of a 63-year-old female patient referred to our department due to an early postoperative complication resulting from intraoperative fault. During the preparation of a bone socket for the acetabular cup, the acetabular fossa was broken, forming an extensive segmental defect of the diameter of the reamer used. An attempt to stabilize the acetabular prosthesis using bone cement without repairing the bone defect was ineffective and inappropriate. During the deposition of the acetabular prosthesis on the cement, much of the cement was pushed beyond the outline of the bony acetabulum...
May 5, 2016: Ortopedia, Traumatologia, Rehabilitacja
https://www.readbyqxmd.com/read/28148672/reconstruction-with-3d-printed-pelvic-endoprostheses-after-resection-of-a-pelvic-tumour
#18
H Liang, T Ji, Y Zhang, Y Wang, W Guo
AIMS: The aims of this retrospective study were to report the feasibility of using 3D-printing technology for patients with a pelvic tumour who underwent reconstruction. PATIENTS AND METHODS: A total of 35 patients underwent resection of a pelvic tumour and reconstruction using 3D-printed endoprostheses between September 2013 and December 2015. According to Enneking's classification of bone defects, there were three Type I lesions, 12 Type II+III lesions, five Type I+II lesions, two Type I+II+III lesions, ten type I+II+IV lesions and three type I+II+III+IV lesions...
February 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28148657/orthopaedic-surgical-site-infection-surveillance-in-nhs-england-national-audit-of-current-practice
#19
REVIEW
E K Tissingh, A Sudlow, A Jones, J F Nolan
AIMS: The importance of accurate identification and reporting of surgical site infection (SSI) is well recognised but poorly defined. Public Health England (PHE) mandated collection of orthopaedic SSI data in 2004. Data submission is required in one of four categories (hip prosthesis, knee prosthesis, repair of neck of femur, reduction of long bone fracture) for one quarter per year. Trusts are encouraged to carry out post-discharge surveillance but this is not mandatory. Recent papers in the orthopaedic literature have highlighted the importance of SSI surveillance and the heterogeneity of surveillance methods...
February 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28138720/the-dual-mobility-cup-in-muscular-skeletal-oncology-rationale-and-indications
#20
Carmine Zoccali, Dario Attala, Alessandra Scotto di Uccio, Barbara Rossi, Gennaro Scotto, Roberto Biagini
PURPOSE: Because of the improvement of medical therapy and the corresponding increase in life expectancy, orthopaedic surgeons are obliged to perform more wide resections rather than intramedullary stabilization nailing for patients affected by tumours of the hip compared to the past. Wide resection often causes joint instability, so prosthetic reconstruction presents a higher risk of dislocation than in primary osteoarthritis cases. The aim of the present paper is to classify the indications for the dual mobility cup (DMC) hip prosthesis based on the anatomic structures involved in the disease and to analyse the rationale to reduce the risk of dislocation...
January 31, 2017: International Orthopaedics
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