Yaohui Wang, Ani Ural
Despite evidence of contribution of mineralized collagen fibrils (MCF) to both the microscale elastic and fracture response of bone, the extent of influence of MCF orientation and material property variation on the lamellar scale mechanical properties is still not well quantified. To this end, in this study, we developed a three-dimensional multiscale finite element model that linked submicroscale models of MCF networks to microscale models of several lamellae. The developed models evaluated the individual and relative influence of MCF orientation as well as material property variation due to MCF mineral distribution and interaction on the lamellar scale mechanical response of bone...
September 9, 2020: Journal of Biomechanics
Shuai Wang, A-Qin Peng, Shuo Pan, Ya-Ning Hu, Xiao Zhang, Jian-Guo Gao
BACKGROUND: The Wahlquist system classifies tibial medial plateau fractures into three types based on the sagittal fracture line location, with type C at highest risk of complications. However, the injury mechanism of tibial medial plateau fractures, especially tibial rotation movement, remains unclear. The purpose of the present study was to determine the injury patterns of medial tibial plateau fractures using 3D model simulation and quantitative 3D measurements. METHODS: Seventy-eight consecutive AO/OTA type 41-B tibial plateau fractures were retrospectively analyzed using CT-based 3D models and quantitative 3D measurements...
September 16, 2020: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
Andrea Hedergott, Ursula Pink-Theofylaktopoulos, Antje Neugebauer, Julia Fricke
BACKGROUND: For some patients with complex ocular motility disorders, conventional strabismus surgery is insufficient. Surgery with tendon elongation allows correction of larger angles and maintains a sufficient arc of contact for rectus muscles. This study reports results for tendon elongation with bovine pericardium (Tutopatch®) in indications other than Graves' orbitopathy in which it is already widely used. METHODS: We reviewed the records of all patients who underwent surgery with Tutopatch® in our institution...
September 19, 2020: Graefe's Archive for Clinical and Experimental Ophthalmology
Young-Kyu Kim, Suk-Woong Kang, Kyu-Hak Jung, Young-Kwang Oh
PURPOSE: To evaluate the potential of locking compression plate with intramedullary fibular allograft in managing proximal humeral fractures with an unstable medial column. METHODS: Between March 2007 and March 2015, we retrospectively analyzed 63 patients who underwent locking plate fixation for proximal humeral fracture with an unstable medial column. All patients were assigned into group 1 (patients treated with locking plate) and group 2 (patients treated with locking plate with intramedullary fibular allograft)...
September 18, 2020: Archives of Orthopaedic and Trauma Surgery
Zihua Li, Xinbo Wu, Haichao Zhou, Shaochen Xu, Fajiao Xiao, Hui Huang, Yunfeng Yang
BACKGROUND: Extensile lateral approach had been recognized as the gold standard technique for displaced intra-articular calcaneus fractures (DIACFs) while sinus tarsi approach had been increasingly valued by surgeons and comparative clinical outcome was shown in both techniques. Appropriate decisions could be made by the clinicians with the help of cost-utility analysis (CUA) about optimal healthcare for type II/III calcaneus fracture. METHOD: A single-center, retrospective study was conducted in which basic characteristics, clinical outcomes, and health care costs of 109 patients had been obtained and analyzed...
September 18, 2020: Journal of Orthopaedic Surgery and Research
Laxmi Kandel, Ravish Mishra, Deepak Yadav, Shashank Tripathi, Snigdha Shubham, Pradip Chhetri
BACKGROUND: Previous studies have shown that the position and presence of mandibular third molars is associated with a has high risk of mandibular angle fractures. The aim of this study was to assess the relationship between the position and presence of mandibular third molars and mandibular angle fractures. MATERIAL AND METHODS: A retrospective study consisting of 256 patients who were admitted for treatment of mandibular fractures between January 2016 and January 2018 was undertaken...
September 18, 2020: Dental Traumatology: Official Publication of International Association for Dental Traumatology
Hüseyin Fatih Sevinç, Meric Cirpar, Ibrahim Deniz Canbeyli, Bülent Dağlar, Birhan Oktas, Serhat Durusoy
BACKGROUND: We aimed to compare clinical and functional outcomes between patients treated with Dynamic hip screw (DHS) and Proximal Femoral Nail-Antirotation (PFN-A) implants. METHODS: This study included 122 patients (66 men [54.1%] and 56 women [45.9%]) who underwent surgery with DHS and PFN-A for an intertrochanteric femur fracture and had at least 12 months follow-up. Reduction assessment, femoral neck-shaft angle and tip-apex distance measurements were performed in early postoperative radiographs...
September 2020: Turkish Journal of Trauma & Emergency Surgery: TJTES
Evren Karaali, Osman Ciloglu, Altuğ Duramaz, Aslihan Kusvuran Ozkan, Timur Ekiz
BACKGROUND: This study aims to compare clinical and radiographic outcomes of surgical treatment and conservative treatment with bracing in neurologically intact patients with score 4 of TLICS thoracolumbar vertebra fractures. METHODS: Patients with traumatic thoracolumbar junction fractures (T11-L2), the score of TLICS 4, and minimum 24-month follow-up were included in this study. Patients were divided into surgery and bracing groups. The groups were compared concerning clinical and demographical features, local kyphotic angles (LKA), vertebra height loss percentage (VHL), Oswestry Disability Index (ODI), Visual Analog Scale (VAS) and time to return to work...
September 2020: Turkish Journal of Trauma & Emergency Surgery: TJTES
Stella J Lee, Hannah Merrison, Kathryn A Williams, Carley B Vuillermin, Andrea S Bauer
BACKGROUND: There is no clear consensus for the criteria for closed treatment of metacarpal neck fractures. Our objective was to determine whether closed reduction of pediatric fifth metacarpal neck fractures results in a clinically meaningful improvement in radiographic angulation. METHODS: We performed a retrospective cohort study of pediatric patients with fifth metacarpal neck fractures treated with closed reduction. Radiographs were examined for sagittal fracture angulation measured post-reduction, 2 to 14 days post-reduction, and 21 to 35 days post-reduction...
September 17, 2020: Hand: Official Journal of the American Association for Hand Surgery
T Pillukat, J Windolf, J van Schoonhoven
OBJECTIVE: a) Fixed-angle bridging of the wrist between radius diaphysis and metacarpus by percutaneous or minimally invasively inserted threaded pins and a frame (fixator) placed above the skin level (external); b) retention of fracture fragments by ligamentotaxis; c) temporary stabilization after bone loss at wrist and distal forearm. INDICATIONS: a) Initial treatment of fractures near the wrist or soft tissue injuries in multiple trauma patients; b) fractures of the distal radius and the distal ulna; c) dislocation of the carpus; d) infections of the wrist; e) instability after resection in the wrist area; f) fractures with impending or manifest compartment syndrome; g) fractures with extensive loss of soft tissues and lacking coverage of implants...
September 16, 2020: Operative Orthopädie und Traumatologie
A T Harding, B K Weeks, C Lambert, S L Watson, L J Weis, B R Beck
Our aim was to explore change in kyphosis and vertebral fracture incidence following 8 months of high-intensity resistance and impact training (HiRIT) or machine-based isometric axial compression (IAC) training in men with osteopenia and osteoporosis. HiRIT and IAC improved posture. HiRIT participants did not experience progression or incident vertebral fracture. IAC participants did experience progression and incident vertebral fracture. INTRODUCTION: The Lifting Intervention For Training Muscle and Osteoporosis Rehabilitation for Men (LIFTMOR-M) trial examined efficacy and safety of an eight-month, supervised, high-intensity progressive resistance and impact training (HiRIT) program compared with machine-based isometric axial compression (IAC) training in middle-aged and older men with low areal bone mineral density (aBMD)...
September 15, 2020: Osteoporosis International
Jie Chang, Jiang Cao, Ziyan Huang, Boyao Wang, Tao Sui, Xiaojian Cao
Thoracolumbar fractures are usually treated by open posterior pedicle screw fixation. However, this procedure involves massive paraspinal muscle stripping, inflicting surgical trauma, and prolonged X-ray exposure. In this study, we observed 127 patients with single-segment injury thoracolumbar fractures. Thirty-six patients were treated by the modified Wiltse's paraspinal approach with minimally invasive channel system, while 91 patients were treated via traditional posterior approach. Operation time, intraoperative blood loss, intraoperative fluoroscopy frequency, screw placement accuracy, visual analogue scale score, and Cobb's angle of two groups were compared...
July 30, 2020: Journal of Biomedical Research
Zhangheng Huang, Yuexin Tong, Zhiyi Fan, Chuan Hu, Chengliang Zhao
BACKGROUND: The objective of this study was to evaluate the feasibility, safety, efficacy, and indications of percutaneous pedicle screw fixation (PPSF) combined with selective transforaminal endoscopic decompression (TED) in the treatment of thoracolumbar burst fracture (TBLF). METHODS: From August 2015 to October 2018, a total of 41 patients with single-segment TLBF (28 men and 13 women) were enrolled in this study. X-ray and computed tomography were obtained before surgery, 1 week after surgery, and 1 year after surgery to evaluate spinal recovery...
September 15, 2020: Journal of Orthopaedic Surgery and Research
Christof Hoffmann, Ulrich Josef Spiegl, Robert Paetzold, Brian Devitt, Stefan Hauck, Thomas Weiss, Volker Bühren, Oliver Gonschorek
BACKGROUND: Minimally invasive, thoracoscopic anterior spondylodesis (MIAS) is an established treatment for burst fractures of the thoracolumbar spine. Good restoration of the local sagittal alignment and good functional results have been reported. The aim of this study was to evaluate long-term results of MIAS in patients with incomplete burst fractures and to analyze the influence on global sagittal alignment, clinical outcomes, and adjacent segment degeneration. METHODS: From 2002 to 2003, 18 patients were treated with MIAS for incomplete thoracolumbar burst fractures...
September 15, 2020: Journal of Orthopaedic Surgery and Research
Shu Lin, Jiang Hu, Lun Wan, Liuyi Tang, Yue Wang, Yang Yu, Wei Zhang
Objective: To evaluate the safety and effectiveness of robot-guided percutaneous kyphoplasty (PKP) in treatment of multi-segmental thoracolumbar osteoporotic vertebral compression fracture (OVCF). Methods: A clinical data of 63 cases with multi-segmental thoracolumbar OVCF without neurologic deficit treated with PKP between October 2017 and February 2019 were analyzed retrospectively. The patients were divided into robot-guided group (33 cases) and traditional fluoroscopy group (30 cases)...
September 15, 2020: Chinese Journal of Reparative and Reconstructive Surgery
Kai Chu, Xinglin Zhang, Xing Lu, Xu Chen
Objective: To explore the changes of bone and risk of micro-fracture in femoral head after removal of cannulated screws following femoral neck fracture healing under the impact force of daily stress. Methods: A total of 42 specimens of normal hip joint were collected from 21 adult fresh cadaveric pelvic specimens. Wiberg central-edge (CE) angle, bone mineral density, diameter of femoral head, neck-shaft angle, and anteversion angle of femoral neck were measured...
September 15, 2020: Chinese Journal of Reparative and Reconstructive Surgery
Qian Wang, Junqi Shen, Shengsun Hu, Guancheng Zhao, Jie Zhou
High-quality joining of dissimilar alloys between Fe-36Ni alloy and 304L stainless steel is essential in the manufacturing of LNG tanker. In this study, lap joints of Fe-36Ni and 304L dissimilar alloys were fabricated by a pulsed gas tungsten arc welding (P-GTAW) process. The effects of low-frequency pulse on the appearance, microstructure and mechanical properties of the Fe-36Ni/304L lap joints was investigated. With the increase of frequency, the feature sizes of α (the transition angle of the upper surface of Fe-36Ni to the surface of the weld bead) and R (shortest distance between weld root and weld surface) exhibited downtrend and uptrend, respectively, while La (the maximum weld width of lower sheet) and P (the maximum weld penetration of lower sheet) changed in a smaller range...
September 10, 2020: Materials
Fernando Diaz-Dilernia, Agustin Garcia-Mansilla, Lionel Llano, Martin Buljubasich, Jose Ignacio Oñativia, Pablo Ariel Isidoro Slullitel, Gerardo Zanotti, Fernando Comba, Francisco Piccaluga, Martin Alejandro Buttaro
Background: This study aims to analyze the ability to restore hip biomechanics in patients who undergo total hip arthroplasty for displaced femoral neck fractures operated by either hip surgeons (HSs) or orthopaedic residents (ORs). Methods: We retrospectively compared 95 patients treated by HSs (group A) with 110 patients treated by ORs (group B). Leg-length discrepancy, femoral offset (FO), center of rotation (COR), acetabular inclination, and acetabular anteversion were evaluated on postoperative radiographs using the healthy contralateral hip as control...
December 2020: Arthroplasty Today
E Fleischhacker, G Siebenbürger, T Helfen, J Gleich, W Böcker, B Ockert
BACKGROUND: The aim of this study was to evaluate functional outcomes in patients with varus malposition following open reduction and internal fixation of displaced proximal humeral fractures. METHODS: Data of 685 patients with a mean age of 67±15.8 years (67% female), that were treated by open reduction and internal fixation for a displaced proximal humeral fracture at a level 1 trauma center, were analyzed. On standardized x-ray imaging, the degree of varus displacement was measured over a minimum of two years follow-up and patients were divided into three groups...
September 7, 2020: Injury
Hongyu Wei, Chunke Dong, Yuting Zhu, Haoning Ma
BACKGROUND: A systematic review and meta-analysis to assess the pros and cons of percutaneous vertebroplasty (PVP) versus kyphoplasty (PKP) for osteoporotic vertebral compression fractures (OVCFs) with intravertebral cleft (IVC) including all available evidence from controlled trials. METHODS: Databases including Pubmed, Embase, Cochrane Library, China National Knowledge Infrastructure (CNKI), and Wanfang Data were searched to identify relevant studies comparing PVP and PKP for OVCFs with IVC...
September 10, 2020: Journal of Orthopaedic Surgery and Research
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