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Distal femur

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https://www.readbyqxmd.com/read/29157842/femoral-intertrochanteric-nail-fitn-a-new-short-version-design-with-an-anterior-curvature-and-a-geometric-match-study-using-post-operative-radiographs
#1
Shi-Min Chang, Sun-Jun Hu, Zhuo Ma, Shou-Chao Du, Ying-Qi Zhang
OBJECTIVE: Femoral intertrochanteric fractures are usually fixed with short, straight cephalomedullary nails. However, mismatches between the nail and the femur frequently occur, such as tip impingement and tail protrusion. The authors designed a new type of short femoral intertrochanteric nail (fitn) with an anterior curvature (length=19.5cm, r=120cm) and herein report the geometric match study for the first of 50 cases. METHODS: A prospective case series of 50 geriatric patients suffering from unstable intertrochanteric fractures (AO/OTA 31 A2/3) were treated...
November 17, 2017: Injury
https://www.readbyqxmd.com/read/29157109/comparison-of-patellar-tracking-according-to-different-angles-of-external-rotation-of-femoral-component-in-varus-knee-of-asians
#2
Jai Hyung Park, Seong-Il Bin, Jong-Min Kim, Bum-Sik Lee, Chang-Rack Lee, Jong-Min Kim, Yongun Cho
PURPOSE: Racial difference in the femoral geometry may exist. Asian femurs may be more externally rotated. If anatomical differences in distal femur had existed between Caucasians and Asians, the group with 5° external rotation of the femoral component should have shown better results than the group with 3° external rotation of the femoral component have. METHODS: 598 patients underwent total knee arthroplasty in our institution, among whom 83 patients (115 knees) who had postoperative computed tomography (CT) were studied retrospectively...
September 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/29153449/the-changing-epidemiology-of-open-fractures-in-vehicle-occupants-pedestrians-motorcyclists-and-cyclists
#3
Dennis Winkler, Stuart T Goudie, Charles M Court-Brown
AIMS: To investigate the changing epidemiology of open fractures in vehicle occupants, pedestrians, motorcyclists and cyclists. MATERIALS AND METHODS: Data on all non-spinal open fractures admitted to the Royal Infirmary of Edinburgh after a road traffic accident between 1988 and 2010 were collected and analysed to provide information about the changing epidemiology in different patient groups. Demographic information was collected on all patients with the severity of injury being analysed with the Injury Severity Score (ISS), Musculoskeletal Index (MSI) and the number of open fractures...
November 14, 2017: Injury
https://www.readbyqxmd.com/read/29151998/hallux-osteoid-osteoma-a-case-report-and-literature-review
#4
REVIEW
Konstantinos C Xarchas, George Kyriakopoulos, Spyros Manthas, Leon Oikonomou
Osteoid osteoma is a benign bone tumour that mostly affects males in the second and third decade of their life. The lesion mainly occurs in long bones, usually in the femur and tibia, causing severe localized pain that is worse at night and responds to nonsteroidal anti-inflammatory drugs (NSAIDs). Diagnosis is usually made on the basis of history and radiographic findings. However, in more unusual locations as the hand and foot, diagnostic issues can arise. Treatment often includes complete removal of the tumor...
2017: Open Orthopaedics Journal
https://www.readbyqxmd.com/read/29150186/articular-scaling-and-body-mass-estimation-in-platyrrhines-and-catarrhines-modern-variation-and-application-to-fossil-anthropoids
#5
Jonathan M G Perry, Siobhán B Cooke, Jacqueline A Runestad Connour, M Loring Burgess, Christopher B Ruff
Body mass is an important component of any paleobiological reconstruction. Reliable skeletal dimensions for making estimates are desirable but extant primate reference samples with known body masses are rare. We estimated body mass in a sample of extinct platyrrhines and Fayum anthropoids based on four measurements of the articular surfaces of the humerus and femur. Estimates were based on a large extant reference sample of wild-collected individuals with associated body masses, including previously published and new data from extant platyrrhines, cercopithecoids, and hominoids...
November 14, 2017: Journal of Human Evolution
https://www.readbyqxmd.com/read/29150174/a-new-species-of-discocyrtanus-from-mato-grosso-brazil-opiliones-gonyleptidae-with-a-key-to-the-species-of-the-genus
#6
Rafael N Carvalho, Adriano B Kury
Discocyrtanus canjinjim sp. n., belonging to the family Gonyleptidae Sundevall, 1833 is described based on nineteen specimens, eleven adult males and eight adult females, collected in the Vila Bela da Santíssima Trindade, in the State of Mato Grosso, Brazil. This new species represents an endemic component for the harvestmen fauna of Chiquitano Dry Forests terrestrial eco-region, being the most occidental point of distribution of the genus, notably found in the Cerrado and the Atlantic Forest. The new species is characterized by femur IV swollen with the same length of dorsal scutum, trochanter IV with prodorsal distal apophysis as a stout hook not bifurcated, and a unique form of genitalia in the genus...
November 14, 2017: Comptes Rendus Biologies
https://www.readbyqxmd.com/read/29147761/single-leg-spica-provides-adequate-stability-after-open-reduction-in-developmental-dysplasia-of-the-hip
#7
Nabil Alassaf
INTRODUCTION: The late detection of developmental dysplasia of the hip (DDH) will remain a major concern in some parts of the world until effective screening programs become available. With late diagnosis comes the need for open surgical reduction. Surgery is invariably followed by a period of immobilisation in a spica cast to prevent postoperative displacement. The goal of this study is to evaluate the effect of double-leg spica as compared to single-leg spica, on the risk of displacement after unilateral open reduction of the hip...
November 16, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/29145297/therapeutic-effect-of-neoadjuvant-chemotherapy-combined-with-curettage-to-treat-distal-femoral-osteosarcoma-a-case-report
#8
Qi Lai, Conglin Ye, Tian Gao, Jun Xiao, An Xie, Xuqiang Liu, Xiaolong Yu, Jun Liu, Min Dai, Hucheng Liu, Bin Zhang
RATIONALE: Osteosarcoma is the most common malignant bone tumor in children and adolescents. Metastasis occurs early, the mortality rate is high, and the tumor results in a tremendous physical, mental, and economic burden on patients. Therefore, the treatment of osteosarcoma has been important for orthopedic surgeons. However, treatment has always been a difficult problem globally. PATIENT CONCERN: We present the case of a 22-year-old girl with increasing local pain in the distal left thigh...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29145279/osteosarcoma-in-the-coracoid-process-that-mimicked-an-osteochondroma-a-case-report
#9
Zhiping Luo, Conglin Ye, Hong-Xun Sang
RATIONALE: Osteosarcomas are the most common primary malignant bone tumors in children and young adults; these tumors often affect the metaphyses of long bones such as the proximal humerus, proximal tibia, and distal femur. In contrast, osteosarcoma of the coracoid process is extremely rare. PATIENT CONCERNS: Herein, we describe a case of osteosarcoma affecting the coracoid process in a 40-year-old woman. The patient presented with shoulder pain, weakness, and an inability to raise her left arm...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29145256/morphologic-features-of-the-distal-femur-and-tibia-plateau-in-southeastern-chinese-population-a-cross-sectional-study
#10
Lin Fan, Tianyang Xu, Xifan Li, Pengfei Zan, Guodong Li
Morphologic measurements of the femoral and tibial features of western population have been done in several studies, which provides the fundamental data for the design of total knee arthroplasty prosthesis used globally, including China. However, researches on anatomic and morphologic features of the knee in Chinese populations of both sexes have never been conducted. Our study was aimed at investigating the anatomic and morphologic features of the knees of the Southeastern Chinese population by magnetic resonance imaging (MRI) scans, so as to provide parameters for sex- and ethnic-specific implant designs in the future...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29141620/treatment-of-genu-valgum-in-children-by-means-of-temporary-hemiepiphysiodesis-using-eight-plates-short-term-findings
#11
Dirk Zajonz, Eckehard Schumann, Magdalena Wojan, Fabian B Kübler, Christoph Josten, Ulf Bühligen, Christoph E Heyde
BACKGROUND: Idiopathic genu valgum is a frequently diagnosed growth disorder in adolescence. Whenever the possibilities of conservative therapy have been exhausted, leg straightening by means of hemiepiphysiodesis has become the standard form of treatment. Because of their flexible screw-plate connection, eight-Plates have been reported in the literature to lead to lower complications regarding implant loosening and fracture compared to other implants. The aim of this retrospective survey was to analyse our own patient population who were treated for genu valgum by means of temporary hemiepiphysiodesis near the knee using eight-Plates to modulate growth...
November 15, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29139158/macro-anatomical-and-morphometric-studies-of-the-hindlimb-of-grasscutter-thryonomys-swinderianus-temminck-1827
#12
K T Onwuama, S A Ojo, J O Hambolu, T Dzenda, F O Zakari, S O Salami
The hindlimb of the grasscutter (Thryonomys swinderianus, Temminck-1827) was studied using 12 adult (≥6 months) rats of either sex with the mean weights of 1.42 ± 0.20 kg and 0.82 ± 0.13 kg for buck (n = 6) and doe (n = 6), respectively (p < .05). Characteristics of the bones were studied by gross observation after their preparation. Measurements of different segments of the hindlimb were also taken, giving a total average length of 31.80 cm. Correlation coefficients between length of bone and weight of rats were positive (p < ...
November 14, 2017: Anatomia, Histologia, Embryologia
https://www.readbyqxmd.com/read/29139053/incorporating-tissue-anisotropy-and-heterogeneity-in-finite-element-models-of-trabecular-bone-altered-predicted-local-stress-distributions
#13
Max A Hammond, Joseph M Wallace, Matthew R Allen, Thomas Siegmund
Trabecular bone is composed of organized mineralized collagen fibrils, which results in heterogeneous and anisotropic mechanical properties at the tissue level. Recently, biomechanical models computing stresses and strains in trabecular bone have indicated a significant effect of tissue heterogeneity on predicted stresses and strains. However, the effect of the tissue-level mechanical anisotropy on the trabecular bone biomechanical response is unknown. Here, a computational method was established to automatically impose physiologically relevant orientation inherent in trabecular bone tissue on a trabecular bone microscale finite element model...
November 14, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/29124468/mortality-following-benign-sacral-insufficiency-fracture-and-associated-risk-factors
#14
Jae-Woo Park, Sang-Min Park, Hui Jong Lee, Choon-Ki Lee, Bong-Soon Chang, Hyoungmin Kim
This study demonstrated increased mortality following sacral insufficiency fractures as with other major osteoporotic fractures. The 6-month mortality rate was 9.8%, the 1-year mortality rate was 17.5%, and the 3-year mortality rate was 25.5%. Sex- and age-adjusted standardized mortality ratio increased after fractures. INTRODUCTION: There are no data about mortality after sacral insufficiency fractures. The purposes of this study were to investigate the mortality rate among sacral insufficiency fracture patients and to identify risk factors associated with mortality...
November 9, 2017: Archives of Osteoporosis
https://www.readbyqxmd.com/read/29119115/optimization-of-the-time-window-of-interest-in-ovariectomized-imprinting-control-region-mice-for-antiosteoporosis-research
#15
Lei Song, Ya-Nan Bi, Pan-Yang Zhang, Xiao-Mei Yuan, Ying Liu, Yue Zhang, Ju-Yang Huang, Kun Zhou
This study was performed to determine the optimal window of time during which the properties of osteoporosis are obvious and to explore the best region of interest for microstructural evaluation in antiosteoporosis research in an ovariectomized mouse model by examining changes in micro-computed tomography parameters and serum indices. Ovariectomized mice and sham-operated mice were randomly divided into five groups. At the end of the 4th, 8th, 12th, 16th, and 20th weeks after ovariectomy, the microstructure of the proximal tibia and distal femur was scanned by micro-computed tomography and blood samples were collected to detect serum biochemical indicators including alkaline phosphatase, osteocalcin, N-terminal propeptide of type I procollagen (P1NP), and C-terminal telopeptide fragment of type I collagen (CTX1)...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29116356/population-based-epidemiology-and-incidence-of-distal-femur-fractures
#16
Rasmus Elsoe, Adriano Axel Ceccotti, Peter Larsen
PURPOSE: The literature lacks recent epidemiological studies on the incidence, trauma mechanism and fracture classification of distal femur fractures. The aim of the present study was to provide up-to-date information concerning the incidence of distal femur fractures in a large and complete population and to report on the distribution of fracture classification, trauma mechanisms and patient baseline demographics. METHODS: The approach for this study was via a retrospective reviews of records...
November 7, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/29113210/analysis-of-imaging-characteristics-of-primary-malignant-bone-tumors-in-children
#17
Yingwei Sun, Xueyong Liu, Shinong Pan, Chunbo Deng, Xiaohan Li, Qiyong Guo
The present study aimed to investigate the imaging characteristics of primary malignant bone tumors in children. The imaging results of 34 children with primary malignant bone tumors confirmed by histopathological diagnosis between March 2008 and January 2014 were retrospectively analyzed. In total, 25 patients had osteosarcoma, with radiography and computed tomography (CT) showing osteolytic bone destruction or/and osteoblastic bone sclerosis, an aggressive periosteal reaction, a soft-tissue mass and cancerous bone...
November 2017: Oncology Letters
https://www.readbyqxmd.com/read/29113159/treatment-of-osteosarcoma-around-the-knee-in-skeletally-immature-patients
#18
Weitao Yao, Qiqing Cai, Jiaqiang Wang, Songtao Gao
Limb sparing surgery in growing young patients with malignant tumors is difficult as invasion of the physis by the tumor or surgical resection through the metaphysis may cause significant limb discrepancy following surgery. At present, hinged tumor prosthesis or biological reconstructions are the main methods following tumor resection in these patients. The aim of the present study was to assess different procedures for the treatment of osteosarcoma around knee joints in immature patients. A retrospective study of 56 patients (<15 years old, open physis) who had been treated for osteosarcoma around the knee joint between January 2007 and December 2015 was performed...
November 2017: Oncology Letters
https://www.readbyqxmd.com/read/29107950/a-new-method-to-determine-cortical-bone-thickness-in-ct-images-using-a-hybrid-approach-of-parametric-profile-representation-and-local-adaptive-thresholds-accuracy-results
#19
Oleg Museyko, Bastian Gerner, Klaus Engelke
MOTIVATION: Cortical bone is an important contributor to bone strength and is pivotal to understand the etiology of osteoporotic fractures and the specific mechanisms of antiosteoporotic treatment regimen. 3D computed tomography (CT) can be used to measure cortical thickness, density, and mass in the proximal femur, lumbar vertebrae, and distal forearm. However, the spatial resolution of clinical whole body CT scanners is limited by radiation exposure; partial volume artefacts severely impair the accurate assessment of cortical parameters, in particular in locations where the cortex is thin such as in the lumbar vertebral bodies or in the femoral neck...
2017: PloS One
https://www.readbyqxmd.com/read/29105022/homozygous-dkk1-knockout-mice-exhibit-high-bone-mass-phenotype-due-to-increased-bone-formation
#20
Michelle M McDonald, Alyson Morse, Aaron Schindeler, Kathy Mikulec, Lauren Peacock, Tegan Cheng, Justin Bobyn, Lucinda Lee, Paul A Baldock, Peter I Croucher, Patrick P L Tam, David G Little
Wnt antagonist Dkk1 is a negative regulator of bone formation and Dkk1 (+/-) heterozygous mice display a high bone mass phenotype. Complete loss of Dkk1 function disrupts embryonic head development. Homozygous Dkk1 (-/-) mice that were heterozygous for Wnt3 loss of function mutation (termed Dkk1 KO) are viable and allowed studying the effects of homozygous inactivation of Dkk1 on bone formation. Dkk1 KO mice showed a high bone mass phenotype exceeding that of heterozygous mice as well as a high incidence of polydactyly and kinky tails...
November 6, 2017: Calcified Tissue International
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