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https://www.readbyqxmd.com/read/29221903/discrete-element-analysis-is-a-valid-method-for-computing-joint-contact-stress-in-the-hip-before-and-after-acetabular-fracture
#1
Kevin C Townsend, Holly D Thomas-Aitken, M James Rudert, Andrew M Kern, Michael C Willey, Donald D Anderson, Jessica E Goetz
Evaluation of abnormalities in joint contact stress that develop after inaccurate reduction of an acetabular fracture may provide a potential means for predicting the risk of developing post-traumatic osteoarthritis. Discrete element analysis (DEA) is a computational technique for calculating intra-articular contact stress distributions in a fraction of the time required to obtain the same information using the more commonly employed finite element analysis technique. The goal of this work was to validate the accuracy of DEA-computed contact stress against physical measurements of contact stress made in cadaveric hips using Tekscan sensors...
November 16, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29212625/use-of-tricortical-iliac-crest-strut-autograft-in-comminuted-posterior-wall%C3%A2-acetabular-fractures-a-case-series
#2
Sandeep Gupta, Naveen Mittal, Jagandeep Singh Virk
PURPOSE: The results for fixation of comminuted posterior wall acetabular fractures are not very promising with reported complications in terms of osteoarthritis, nonunion and malunion which subsequently require conversion to total hip arthroplasty. The conversion to total hip arthroplasty is possible in patients over 50 years of age but not in younger patients. So this requires new methods for salvage of the native hip in young patients. METHODS: There were six patients in our series with highly comminuted posterior wall acetabular fractures where the fragments were excised and the gap filled with tricortical anterior iliac-crest strut autograft, fixed with screws and plate...
November 6, 2017: Chinese Journal of Traumatology, Zhonghua Chuang Shang za Zhi
https://www.readbyqxmd.com/read/29206797/instability-of-the-hip-joint-after-posterior-acetabular-wall-fracture-independent-risk-factors-remain-elusive
#3
Jay H Patel, Berton R Moed
BACKGROUND: Exact determinants of hip instability have not been established for fractures of the posterior wall of the acetabulum involving ≤50% of the wall. Therefore, examination of the hip under anesthesia (EUA) is routinely performed. Recently, the superior exit point of the fracture has been reported to be an important identifiable risk factor. Pre-existing adult hip dysplasia (developmental dysplasia of the hip [DDH]) is thought to have a similar role. The purpose of this study was to determine if any known radiographic measurements and signs associated with DDH, or any fracture characteristics, are independent risk factors for hip instability after fracture of the posterior wall of the acetabulum...
December 6, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/29206497/computer-assisted-surgery-in-preoperative-planning-of-acetabular-fracture-surgery-state-of-the-art
#4
Aurélien Courvoisier, Mehdi Boudissa, Matthieu Chabanas, Jérôme Tonetti
The development of imaging modalities and computer technology provides a new approach in acetabular surgery. Areas covered: This review describes the role of computer-assisted surgery (CAS) in understanding of the fracture patterns, in the virtual preoperative planning of the surgery and in the use of custom-made plates in acetabular fractures with or without 3D printing technologies. A Pubmed internet research of the English literature of the last 20 years was carried out about studies concerning computer-assisted surgery in acetabular fractures...
December 5, 2017: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/29204491/a-simple-technique-to-remove-well-fixed-acetabular-components-in-revision-of-total-hip-arthroplasty
#5
Xiaoqi Zhang, Fei Hu, Rui He, Xu Li, Xiaofeng Ji, Xifu Shang
Removing well-fixed acetabular components can be a challenge for orthopaedic surgeons in revision of total hip arthroplasty. Acetabular bone loss, fracture, and other complications occurred in extracting implants may result in instability and fail of revision. Thus, instruments are developed to avoid such complications. We report a simple technique by drilling a tunnel on the superolateral quadrant of acetabulum and using an offset staff to remove acetabular components without many matching units. The procedure of removing well-fixed acetabular components is a simple, efficient, inexpensive, bone stock preserving technique...
December 2017: Arthroplasty Today
https://www.readbyqxmd.com/read/29204484/pseudotumor-in-ceramic-on-metal-total-hip-arthroplasty
#6
Yoni M Blau, Andrew J Meyers, Mauro Giordani, John P Meehan
The increasing demand for total hip arthroplasty (THA) in relatively young, high-demand patients has led to the use of hard-on-hard bearing surfaces. Adverse local tissue reaction/pseudotumor and elevated serum metal ion levels are commonly reported complications encountered in metal-on-metal THA, while audible articulation and rim fracture are reported in ceramic-on-ceramic THA. For this reason, ceramic-on-metal THA was implemented as an ideal hard-on-hard bearing combination. In this report, we describe a case of bilateral simultaneous ceramic-on-metal THA in a 69-year-old woman who presented 7 years postoperatively with unilateral hip pain associated with underlying pseudotumor and elevated serum cobalt and chromium ion levels...
December 2017: Arthroplasty Today
https://www.readbyqxmd.com/read/29204481/corrosion-and-adverse-tissue-reaction-after-modular-unipolar-hip-hemiarthroplasty
#7
Brian F Moore, Paul F Lachiewicz
Modern unipolar hip hemiarthroplasty, commonly used for displaced femoral neck fracture, is now modular, with both a variable length cobalt-chromium adapter-sleeve and large femoral head. Patients with these modular components may develop symptomatic trunnion corrosion, with elevated serum metal levels. We report the case of an 82-year-old woman, 5.5 years after a modular unipolar hip hemiarthroplasty, who presented with a 4-month history of hip pain and limp. Evaluation showed elevated serum cobalt and chromium levels and an acetabular cyst...
December 2017: Arthroplasty Today
https://www.readbyqxmd.com/read/29203201/combat-related-acetabular-fractures-outcomes-of-open-versus-closed-injuries
#8
Richard L Purcell, Michael A Donohue, Sameer K Saxena, Wade T Gordon, Louis L Lewandowski
INTRODUCTION: Since the onset of the Global War on Terror close to 50,000 United States service members have been injured in combat, many of these injuries would have previously been fatal. Among these injuries, open acetabular fractures are at an increased number due to the high percentage of penetrating injuries such as high velocity gunshot wounds and blast injuries. These injuries lead to a greater degree of contamination, and more severe associated injuries. There is a significantly smaller proportion of the classic blunt trauma mechanism typically seen in civilian trauma...
December 1, 2017: Injury
https://www.readbyqxmd.com/read/29187475/reliable-radiation-technique-to-minimize-ovarian-dose-during-radiation-prophylaxis-of-heterotopic-ossification
#9
Waleed F Mourad, Satyaseelan Packianathan, Weisi Yan, Mahboubeh Pishgou, John K Ma, Sherif G Shaaban, Edward M Marchan, Rui He, Paul N Mobit, Chunli Claus Yang, Srinivasan Vijayakumar
BACKGROUND/AIM: Scattered radiation during radiotherapy (RT) directed at the hip joint poses concerns about ovarian function in patients of reproductive age. Here, we report the impact of using a split-beam technique (SBT) and different photon energies on the total ovary dose during radiation prophylaxis of heterotopic ossification (HO). PATIENTS AND METHODS: This was a single-institution, retrospective study of 32-patients with traumatic acetabular fractures (TAF)...
December 2017: Anticancer Research
https://www.readbyqxmd.com/read/29178856/influence-of-age-on-results-following-surgery-for-displaced-acetabular-fractures-in-the-elderly
#10
Guo-Chun Zha, Xue-Mei Yang, Shuo Feng, Xiang-Yang Chen, Kai-Jin Guo, Jun-Ying Sun
BACKGROUND: Elderly patients have more special medical needs when compared with young ones; thus, the results of open reduction and internal fixation (ORIF) for acetabular fractures should be stratified by age in these patients. This study seeks to determine whether the age of the patient influences the results of the ORIF for acetabular fractures. METHODS: We performed a retrospective analysis of prospectively collected data on 53 elderly patients with displaced acetabular fractures who underwent ORIF between May 2004 and May 2011...
November 25, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29178854/subtrochanteric-shortening-osteotomy-during-cementless-total-hip-arthroplasty-in-young-patients-with-severe-developmental-dysplasia-of-the-hip
#11
Duan Wang, De-Hua Li, Qi Li, Hao-Yang Wang, Ze-Yu Luo, Yang Yang, Fu-Xing Pei, Zong-Ke Zhou
BACKGROUND: This retrospective study was designed to determine complications, functional and radiographic results of transverse subtrochanteric osteotomy during cementless, modular total hip arthroplasty (THA) in a series of active patients younger than 45 years with Crowe Type-III or IV developmental dysplasia of the hip (DDH). METHODS: We followed 49 patients (56 hips) with DDH who were treated with cementless THA, where the acetabular cup was positioned in the anatomic hip center and where a simultaneous transverse femoral osteotomy was performed...
November 25, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29177370/occult-acetabular-fractures-in-the-elderly-a-report-of-three-cases-and-review-of-literature
#12
Marcus J Lee, Sean Wl Ho, Ernest Bk Kwek
No abstract text is available yet for this article.
October 2017: Annals of the Academy of Medicine, Singapore
https://www.readbyqxmd.com/read/29162246/floating-hip-and-associated-injuries
#13
Plácido Zamora-Navas, Francisco Javier Estades-Rubio, Juan Ramón Cano, Enrique Guerado
AIM: To describe our experience in treating patients diagnosed with floating hip injury and to communicate the outcomes achieved and the rate of complications. A secondary aim is to compare the results of this group in terms of quality of life with those of patients presenting with a fracture either of the pelvis or of the acetabulum, but in which the femoral segment is not involved. PATIENTS AND METHODS: This is a descriptive study of the patients diagnosed with floating hip injury (25 patients) who were treated at our hospital between 2004 and 2007, with a minimum follow-up of seven years...
November 2017: Injury
https://www.readbyqxmd.com/read/29162245/ultrasound-guided-supra-acetabular-pin-placement-in-pelvic-external-fixation-description-of-a-surgical-technique-and-results
#14
Francisco Chana-Rodríguez, Manuel Cuervas-Mons, José Rojo-Manaute, Félix Mora, Juan Arnal, Javier Vaquero-Martín
INTRODUCTION: Pelvic fracture in trauma patients can lead to hemodynamic instability. External fixation is a treatment capable of stabilizing these injuries in the context of damage control surgery. Supra-acetabular pin offers the greater biomechanical stability but requires the use of intraoperative fluoroscopy. The aim of this study was to analyze our results for an ultrasound-guided supra-acetabular pinning. MATERIAL AND METHODS: Cross-sectional study with cadaveric specimens...
November 2017: Injury
https://www.readbyqxmd.com/read/29162239/biomechanical-study-of-pelvic-discontinuity-in-failed-total-hip-arthroplasty-lessons-learnt-from-the-treatment-of-pelvic-fractures
#15
Julio Ribes-Iborra, Carlos Atienza, Jorge Sevil-De la Torre, Amelia Gómez Pérez
Pelvic discontinuity is a rare but serious problem in orthopedic surgery. Acetabular reconstruction in case of severe bone loss after failed total hip arthroplasty is technically difficult, especially in segmental loss type III (anterior or posterior) or pelvic discontinuity (type IV). Acetabular reinforcement devices are frequently used as load-sharing devices to allow allograft incorporation and in order to serve as support of acetabular implants. This study tries to show, by means of biomechanic work, the efficiency of reinforced plate in anterior column in a segmental pelvic loss, illustrated with a clinical case, which shows the socket stability of hip prosthesis...
November 2017: Injury
https://www.readbyqxmd.com/read/29155842/posterior-column-acetabular-fracture-fixation-using-a-w-shaped-angular-plate-a-biomechanical-analysis
#16
Ke Su, Song Liu, Tao Wu, Yingchao Yin, Ruipeng Zhang, Shilun Li, Yingze Zhang
OBJECTIVE: The purpose of this study was to compare the stability and feasibility of four fixation constructs in a posterior column acetabular fracture: one reconstruction plate, one reconstruction plate and lag screw, two reconstruction plates, and a W-shaped acetabular angular plate. METHODS: Twenty embalmed cadaveric pelvises with a posterior column acetabular fractures were allocated to one of four groups: 1) a reconstruction plate, 2) a reconstruction plate with a posterior column lag screw, 3) double reconstruction plates, and 4) a W-shaped acetabular angular plate...
2017: PloS One
https://www.readbyqxmd.com/read/29152495/midterm-outcomes-of-titanium-modular-femoral-necks-in-total-hip-arthroplasty
#17
Thurial Collet, Jean-Pierre Atanasiu, Jean-Baptiste de Cussac, Kamal Oufroukhi, Hugo Bothorel, Mo Saffarini, François Badatcheff
Background: Modular femoral necks present surgical and biomechanical advantages in total hip arthroplasty (THA), but their benefits remain controversial due to risks of corrosion and fracture at the additional junction. This study aimed to report 10-year survival and clinical outcomes of a titanium femoral stem with a titanium modular neck in consecutive series. Methods: The authors reviewed the records of 97 patients (99 THAs) using uncemented modular stem and ceramic-on-ceramic acetabular components...
October 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/29145281/cup-revision-involving-retention-of-a-fixed-but-malpositioned-acetabular-component-in-patients-with-poor-general-conditions
#18
Weiping Su, Min Zeng, Yihe Hu, Jianxi Zhu, Long Wang, Jie Xie
This study evaluated the surgical technique and outcomes of cup revision involving retention of a fixed but malpositioned acetabular component in patients with poor general conditions.Between 2007 and 2013, we performed cup revision on 12 hips while retaining a fixed (either cemented or uncemented) but malpositioned acetabular component. Indications for this technique were: malpositioned but fixed acetabular shell; sufficient space for the insertion of the prosthesis; and patients with poor general conditions...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29130656/-design-of-minimal-invasive-screw-on-posterior-pelvis-ring-and-pelvic-finite-element-analysis
#19
Fan Tang, Li Min, Yan-Ling Wang, Bo Qu, Yong Zhou, Yi Luo, Wen-Li Zhang, Rui Shi, Hong Duan, Chong-Qi Tu
OBJECTIVE: To design minimal invasive screw on posterior pelvic ring and perform threedimensional finite element analysis based on a pelvis finite element model. METHODS: We measured the pelvic anatomical data of 20 healthy volunteers and identified potential designs for minimal invasive screw on posterior pelvic ring. A finite element model of pelvis was then established. Threedimensional finite element analyses were performed under static and dynamic mechanical loading,respectively...
September 2017: Sichuan da Xue Xue Bao. Yi Xue Ban, Journal of Sichuan University. Medical Science Edition
https://www.readbyqxmd.com/read/29099882/management-and-prevention-of-intraoperative-acetabular-fracture-in-primary-total-hip-arthroplasty
#20
Jonathon M Brown, Kevin S Borchard, Claire E Robbins, Daniel M Ward, Carl T Talmo, James V Bono
Intraoperative acetabular fracture (IAF) is a rare complication of primary total hip arthroplasty (THA). Known risk factors include poor bone stock, underreaming of the acetabular bed, and use of elliptic components. There is a paucity of literature on risk factors, treatment strategies, and outcomes of this potentially devastating complication. We studied the incidence of IAF in primary THA at our high-volume institution. We reviewed 21,519 primary THA cases and identified 16 patients (16 hips) with IAFs. Mean follow-up was 4 years (range, 0-10 years)...
September 2017: American Journal of Orthopedics
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