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https://www.readbyqxmd.com/read/28224199/mechanically-aligned-total-knee-arthroplasty-carries-a-risk-of-bony-gap-changes-and-flexion-extension-axis-displacement
#1
Yasuo Niki, Tomoki Sassa, Katsuya Nagai, Kengo Harato, Shu Kobayashi, Taro Yamashita
PURPOSE: The flexion-extension axis (FEA) of the femur is substantially changed after mechanically aligned total knee arthroplasty (TKA) due to a discrepancy in bone cut thickness between the posterior and distal femoral regions. This study assessed the bony gap changes and FEA displacement caused by this problem in osteoarthritis patients. METHODS: The study enrolled 60 knees from 60 patients for whom primary TKA was planned due to medial knee osteoarthritis. All patients underwent computed tomography, and 3-dimensional (3D) bone models were reconstructed on 3D-planning software...
February 21, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28224178/the-role-of-body-weight-on-bone-in-anorexia-nervosa-a-hr-pqct-study
#2
Jacob Frølich, Stinus Hansen, Laura Al-Dakhiel Winkler, Andreas K Andresen, Anne Pernille Hermann, René K Støving
Anorexia nervosa (AN) is associated with decreased bone mineral density and increased risk of fracture. The aim of this study was to assess bone geometry, volumetric bone mineral density (vBMD), trabecular microarchitecture and estimated failure load in weight-bearing vs. non-weight-bearing bones in AN. We included twenty-five females with AN, and twenty-five female controls matched on age and height. Bone geometry, vBMD and trabecular microarchitecture were assessed using high-resolution peripheral quantitative computed tomography of the distal radius and tibia...
February 21, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28214531/the-skeletal-developmental-toxicity-of-chlormequat-chloride-and-its-underlying-mechanisms
#3
Dan Huang, Shuang Wu, Xiaohong Hou, Lixia Jia, Qinghe Meng, Hongqian Chu, Jianjun Jiang, Lanqin Shang, Weidong Hao
Chlormequat Chloride (CCC), a widely used plant growth regulator, could decrease body weight in animals; however, the mechanism has not been well studied. This study was designed to evaluate the skeletal development toxicity of CCC on pubertal male Sprague-Dawley (SD) rats and to investigate whether CCC impacts the development of chondrocyte, osteoblast and osteoclast through growth hormone (GH) and insulin like growth factor 1 (IGF-I). Rats from 23 to 70 on postnatal days were exposed to CCC daily by gavage at doses of 0, 75, 150, and 300mg/kg bw/d...
February 15, 2017: Toxicology
https://www.readbyqxmd.com/read/28199936/the-longitudinal-split-technique-for-narrow-canal-tibia-in-a-case-of-distal-femur-replacement-for-osteosarcoma
#4
Toru Akiyama, Shotaro Kanda, Kazuo Saita
INTRODUCTION: There are currently no available prostheses that can be used for extremely small femurs or tibias of adult patients in countries where allograft is unavailable. CASE REPORT: We report the case of a 17-year-old girl requiring special limb salvage technique for distal femur reconstruction following resection of malignant tumor. This technique was needed because of a very narrow canal of the tibia. We split bilateral tibial cortices longitudinally with osteotomies to enlarge tibial canal enough to insert conventional endoprosthesis...
January 31, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28198793/proximity-and-risks-of-the-anterior-neurovascular-and-tendinous-anatomy-of-the-distal-leg-relative-to-anteriorly-applied-distal-locking-screws-for-tibia-nailing-a-plea-for-open-insertion
#5
Phillip M Mitchell, Cory A Collinge, Eric Barcak, Edward Perez, Kostas Triantafillou
PURPOSE: To determine the proximity and potential risks to distal leg anatomy from anterior to posteriorly (A-P) applied distal tibia locking screws for tibial nailing. DESIGN: Retrospective. SETTING: ACS level I trauma center. PATIENTS/PARTICIPANTS: Twenty consecutive adult patients undergoing computed tomograms with intravenous contrast (CTAs) on uninjured legs. MAIN OUTCOME MEASUREMENTS: Simulated 5 mm distal interlocking screws placed in the A-P axis of an ideally placed tibial nail at 10 mm increments from the tibial plafond (10 to 40mm) were studied in relation to the distal leg's anterior anatomy...
February 14, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28196041/change-in-talar-translation-in-the-coronal-plane-after-mobile-bearing-total-ankle-replacement-and-its-association-with-lower-limb-and-hindfoot-alignment
#6
Young Yi, Jae-Ho Cho, Ji-Beom Kim, Jae-Young Kim, Su-Yeon Park, Woo Chun Lee
BACKGROUND: Mobile-bearing total ankle replacement (TAR) enables motion at the tibial implant-polyethylene insert interface. This motion could lead to coronal translation of the talus relative to the tibia and may affect radiographic outcome. We aimed to assess the translation of the talus before and after mobile-bearing TAR to determine whether translation of the talus after TAR is associated with coronal plane alignment of the lower limb and hindfoot as well as to investigate the complications associated with talar translation...
February 15, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28194714/is-limb-salvage-with-microwave-induced-hyperthermia-better-than-amputation-for-osteosarcoma-of-the-distal-tibia
#7
Kang Han, Peiye Dang, Na Bian, Xiang Chen, Tongtao Yang, QingYu Fan, Yong Zhou, Tingbao Zhao, Pingshan Wang
BACKGROUND: Amputation has been the standard surgical treatment for distal tibia osteosarcoma owing to its unique anatomic features. Preliminary research suggested that microwave-induced hyperthermia may have a role in treating osteosarcoma in some locations of the body (such as the pelvis), but to our knowledge, no comparative study has evaluated its efficacy in a difficult-to-treat location like the distal tibia. QUESTIONS: Does microwave-induced hyperthermia result in (1) improved survival, (2) decreased local recurrence, (3) improved Musculoskeletal Tumor Society (MSTS) scores, or (4) fewer complications than amputation in patients with a distal tibial osteosarcoma? METHODS: Between 2000 and 2015, we treated 79 patients for a distal tibia osteosarcoma without metastases...
February 13, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28192826/the-management-of-bone-defects-in-periarticular-knee-injuries-a-review-article
#8
Brian Buck, Yvonne M Murtha
Traumatic bone defects of the distal femur and proximal tibia present treatment challenges for the orthopaedic traumatologist. In addition to bone loss, significant soft tissue compromise and cartilage defects leave the patient and surgeon with few reconstructive options for proper long-term joint function. These injuries are often complicated by delayed healing, nonunion, malunion, infection, and poor subjective patient outcomes. There are a variety of clinical problems associated with the treatment of periarticular fractures about the knee...
February 13, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28184364/tibial-lengthening-using-a-fixator-assisted-lengthening-plate-a-new-technique
#9
Haci Bayram Tosun, Ismail Agir, Seyitali Gumustas, Sancar Serbest, Abuzer Uludag, Suat Celik
BACKGROUND: There are many techniques that are used for limb lengthening. Lengthening a limb over a plate is an alternative choice used in children or when using an intramedullary nail is difficult. OBJECTIVES: In this study, we presented a new technique for tibial lengthening using a monolateral external fixator over a lengthening plate. MATERIALS AND METHODS: For tibial lengthening, a monolateral external fixator was attached to the composite bone model medially...
November 2016: Trauma Monthly
https://www.readbyqxmd.com/read/28182170/complications-of-minimally-invasive-percutaneous-plating-for-distal-tibial-fractures
#10
Nasir Muzaffar, Rafiq Bhat, Mohammad Yasin
BACKGROUND: The management of distal tibia fractures continues to remain a source of controversy and debate. OBJECTIVES: The aim of this study was to evaluate the various complications of minimally invasive percutaneous plate osteosynthesis (MIPPO) using a locking plate for closed fractures of distal tibia in a retrospective study. PATIENTS AND METHODS: Twenty-five patients with distal tibial fractures, treated by minimally invasive percutaneous plate osteosynthesis, were evaluated in a retrospective study...
July 2016: Trauma Monthly
https://www.readbyqxmd.com/read/28179062/smartphone-assessment-of-knee-flexion-compared-to-radiographic-standards
#11
Matthew J Dietz, Daniel Sprando, Andrew E Hanselman, Michael D Regier, Benjamin M Frye
BACKGROUND: Measuring knee range of motion (ROM) is an important assessment for the outcomes of total knee arthroplasty. Recent technological advances have led to the development and use of accelerometer-based smartphone applications to measure knee ROM. The purpose of this study was to develop, standardize, and validate methods of utilizing smartphone accelerometer technology compared to radiographic standards, visual estimation, and goniometric evaluation. METHODS: Participants used visual estimation, a long-arm goniometer, and a smartphone accelerometer to determine range of motion of a cadaveric lower extremity; these results were compared to radiographs taken at the same angles...
February 5, 2017: Knee
https://www.readbyqxmd.com/read/28173978/the-effects-of-tibia-profile-distraction-angle-and-knee-load-on-wedge-instability-and-hinge-fracture-a-finite-element-study
#12
Pei-Wei Weng, Chia-Hsien Chen, Chu-An Luo, Jui-Sheng Sun, Yang-Hwei Tsuang, Cheng-Kung Cheng, Shang-Chih Lin
Several plate systems for high tibial osteotomy (HTO) have been developed to stabilize the opening wedge of an osteotomized tibia. Among them, the TomoFix system, having a quasi-straight and T-shaped design, has been widely adopted in the literature. However, this system is implemented by inserting a lag (i.e., cortical) screw through the proximal combi-hole, to deform the plate and pull the distal tibia toward the plate. This process potentially induces plate springback and creates an elastic preload on the osteotomized tibia, especially at the lateral hinge of the distracted wedge...
February 4, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28169100/three-dimensional-relationships-between-secondary-changes-and-selective-osteotomy-parameters-for-biplane-medial-open-wedge-high-tibial-osteotomy
#13
Byung Hoon Lee, Chul Won Ha, Sang Won Moon, Minho Chang, Hun Yeong Kim, Sin Hyung Park, Joon Ho Wang
BACKGROUND: To assess the axial rotational change of distal tibia and posterior tibial slope (PTS) change after OWHTO in 3-D planes and to identify the causal relationship on the effect of variation in the posterior slope angle and rotational errors. METHODS: A total of 21 patients (23 knees) underwent OWHTO and were evaluated with 3D-CT before and after surgery. Medial proximal tibial angle in the coronal plane, PTS in the sagittal plane, and rotational axis in axial plane were evaluated and compared between pre- and post-operative 3D models constructed by applying reverse-engineering software...
February 4, 2017: Knee
https://www.readbyqxmd.com/read/28166168/evaluation-of-intra-articular-fracture-extension-following-gunshot-wounds-to-the-lower-extremity-plain-radiographs-versus-computer-tomography
#14
John S Hwang, Kenneth L Koury, George Gorgy, Michael S Sirkin, Mark C Reilly, Valdis Lelkes, Mark R Adams
OBJECTIVE: This study was to compare the use of computer tomography to plain radiographs for the evaluation of intra-articular extension of long bone fractures in the lower extremity following low-energy gunshot wounds. DESIGN: Retrospective chart and radiographic review SETTING:: Level 1 Trauma CenterPatients/Participants: Data was collected from a single institution from 2000 to 2014. Inclusion criteria consisted of patients aged greater than 17 years, low-velocity gunshot injuries causing fracture of the femur or tibia, plain radiographs with adequate films and CT imaging of the fracture...
January 24, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28165605/rotational-alignment-of-the-knee-is-different-in-osteological-specimens-with-and-without-a-large-cam-deformity-of-the-proximal-femur
#15
Jeremy J Gebhart, Jonathan J Streit, Avi Goodman, Jordan Etscheidt, Douglas S Weinberg, Asheesh Bedi, Shane J Nho, Michael J Salata
PURPOSE: We studied a large osteological collection for differences in knee rotation based upon the presence or absence of a large cam deformity of the proximal femur. METHODS: We obtained 357 matched tibiae and femora from the Hamann-Todd Osteological Collection and measured: femoral head-neck alpha angle, anteroposterior axis (or Whiteside's line) at the distal femur relative to the posterior condylar axis, and position of the tibial tubercle with respect to the posterior condylar axis of the proximal tibia...
February 2, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/28164079/short-stature-and-growth-hormone-deficiency-in-a-girl-with-encephalocraniocutaneous-lipomatosis-and-jaffe-campanacci-syndrome-a-case-report
#16
Eun Mi Choi, Nani Jung, Ye Jee Shim, Hee Joung Choi, Joon Sik Kim, Heung Sik Kim, Kwang Soon Song, Hee Jung Lee, Sang Pyo Kim
A 9-year-old Tajikistani girl presented to Keimyung University Dongsan Medical Center for evaluation of a skin lesion on her left eyelid, focal alopecia, unilateral ventricular dilatation, and aortic coarctation. She was diagnosed with encephalocraniocutaneous lipomatosis (ECCL) according to Moog's diagnostic criteria. Café-au-lait spots were found on the left side of her trunk. Multiple nonossifying fibromas were found on her left proximal humerus, left distal femur, both proximal tibias, and left proximal fibula, suggesting Jaffe-Campanacci syndrome (JCS), following imaging of the extremities...
December 2016: Annals of Pediatric Endocrinology & Metabolism
https://www.readbyqxmd.com/read/28164048/rare-giant-cell-tumor-of-olecranon-bone
#17
Pawan Goyal, Vishal Gautam, Narender Saini, Yogesh Sharma
INTRODUCTION: Giant cell tumor (GCT) is a bone tumor involving epiphyseal area of bone abutting the subchondral bone. Commonly found in long bones such as proximal tibia and distal femur. We report a case of GCT of olecranon bone in a 23-year-old male. CASE REPORT: A 23-year-old patient presented to our outpatient department with pain and mild swelling at the elbow from last 2 to 3 months. On examination, it was seen that there was a moderate swelling at the tip of the olecranon...
September 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28159425/magnetic-resonance-imaging-evaluation-of-physeal-violation-in-adolescents-after-transphyseal-anterior-cruciate-ligament-reconstruction
#18
Joon-Ho Wang, Kang-Min Son, Dae-Hee Lee
PURPOSE: To quantify and compare the amount and location of physis violation of the distal femur and proximal tibia after transphyseal anterior cruciate ligament (ACL) reconstruction in skeletally immature patients. METHODS: This study included 19 patients with open physes of the distal femur and proximal tibia who underwent ACL reconstruction with tibialis anterior allografts. Physeal tunnel volume and location on the growth plate, as well as obliquity to the growth plate, were measured by 3-dimensional postoperative magnetic resonance imaging of the distal femur and proximal tibia...
January 31, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28156202/diffusion-tensor-imaging-of-the-physes-a-possible-biomarker-for-skeletal-growth-experience-with-151-children
#19
Maria A Bedoya, Jorge Delgado, Jeffrey I Berman, Nancy A Chauvin, David Zurakowski, Raul Ramirez-Grueso, Aikaterini Ntoulia, Diego Jaramillo
Purpose To determine the changes of diffusion-tensor imaging (DTI) and tractography in the distal femur and proximal tibia related to age, sex, and height. Materials and Methods Following institutional review board approval, with waiver of consent and with HIPAA compliance, the authors retrospectively analyzed DTI images of the knee in 151 children, 73 girls (median age, 14.1 years; range, 6.5-17.8 years) and 78 boys (median age, 16.6 years; range, 6.9-17.9 years), studied from January 2013 to October 2014...
February 2, 2017: Radiology
https://www.readbyqxmd.com/read/28153474/feasibility-of-using-mris-to-create-subject-specific-parallel-mechanism-joint-models
#20
Simao Brito da Luz, Luca Modenese, Nicola Sancisi, Peter M Mills, Ben Kennedy, Belinda R Beck, David G Lloyd
Musculoskeletal models typically use generic 2D models for the tibiofemoral (TFJ) and patellofemoral (PFJ) joints, with a hinge talocrural joint (TCJ), which are scaled to each subject׳s bone dimensions. Alternatively joints' measured kinematics in cadavers are well-predicted using 3D cadaver-specific models. These employ mechanisms constrained by the articulations of geometric objects fitted to the joint׳s surfaces. In this study, we developed TFJ, PFJ and TCJ mechanism-based models off MRIs for fourteen participants and compared the estimated kinematics with those from published studies modified to be consistent with mechanisms models and subject-specific anatomical landmarks...
December 29, 2016: Journal of Biomechanics
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