Reconstructive Options for Auricular Trauma

2021 ◽  
Author(s):  
Kevin Wong ◽  
Anni Wong ◽  
Joseph J. Rousso
Keyword(s):  
Blunt Trauma ◽  
Three Dimensional ◽  
Lateral Position ◽  
Anatomical Site ◽  
External Ear ◽  
Mechanism Of Injury ◽  
Common Site ◽  
Auricular Reconstruction ◽  
Auricular Trauma ◽  
Careful History

AbstractGiven its prominent lateral position, the auricle is a common site of injury after blunt trauma. Auricular injuries can lead to both functional and aesthetic complications. A careful history and examination will help determine the mechanism of injury and identify factors that may influence repair. Auricular reconstruction is highly individualized and depends on the size, location, and nature of injury. Understanding the complex three-dimensional anatomy of the external ear is a necessity for appropriate reconstruction. This article reviews the reconstructive options for simple and complex auricular injuries based on the anatomical site and the intricate three-dimensional structures that form the auricle.

Mechanism of Injury Predicts Patient Mortality and Impairment After Blunt Trauma

2009 ◽  
Vol 153 (1) ◽  
pp. 138-142 ◽  
Author(s):  
Adil H. Haider ◽  
David C. Chang ◽  
Elliott R. Haut ◽  
Edward E. Cornwell ◽  
David T. Efron
Keyword(s):  
Blunt Trauma ◽  
Mechanism Of Injury

The Optimum Cage Position and Orientation on the ALIF with Facet Screw Fixation: A Finite Element Analysis and the Taguchi Method

2011 ◽  
Vol 27 (3) ◽  
pp. 309-320 ◽  
Author(s):  
C.-Y. Fan ◽  
C.-K. Chao ◽  
C.-C. Hsu ◽  
K.-H. Chao
Keyword(s):  
Finite Element ◽  
Taguchi Method ◽  
Screw Fixation ◽  
Three Dimensional ◽  
Element Model ◽  
Lateral Position ◽  
Element Analysis ◽  
Control Factors ◽  
Position And Orientation ◽  
Noise Factors

ABSTRACTAnterior Lumbar Interbody Fusion (ALIF) has been widely used to treat internal disc degeneration. However, different cage positions and their orientations may affect the initial stability leading to different fusion results. The purpose of the present study is to investigate the optimum cage position and orientation for aiding an ALIF having a transfacet pedicle screw fixation (TFPS). A three-dimensional finite element model (ALIF with TFPS) has been developed to simulate the stability of the L4/L5 fusion segment under five different loading conditions. The Taguchi method was used to evaluate the optimized placement of the cages. Three control factors and two noise factors were included in the parameter design. The control factors included the anterior-posterior position, the medio-lateral position, and the convergent-divergent angle between the two cages. The compressive preload and the strengths of the cancellous bone were set as noise factors. From the results of the FEA and the Taguchi method, we suggest that the optimal cage positioning has a wide anterior placement, and a diverging angle between the two cages. The results show that the optimum cage position simultaneously contributes to a stronger support of the anterior column and lowers the risk of TFPS loosening.

scholarly journals Injury patterns of South African international cricket players over a two-season period

2011 ◽  
Vol 23 (2) ◽  
pp. 45 ◽  
Author(s):  
RA Stretch ◽  
RP Raffan
Keyword(s):  
South African ◽  
Exposure Time ◽  
Lower Limbs ◽  
Anatomical Site ◽  
Injury Incidence ◽  
International Level ◽  
Mechanism Of Injury ◽  
Injury Patterns ◽  
Prevalence Data ◽  
Acute Injuries

Objective. The aim of the study was to determine the incidence and nature of injury patterns of South African international cricket players. Methods. A questionnaire was completed for each cricketer who presented with an injury during the 2004 - 2005 (S1) and 2005 - 2006 (S2) cricket seasons to determine the anatomical site, month, diagnosis and mechanism of injury. Results. The results showed that 113 injuries were sustained, with a match exposure time of 1 906 hours for one-day internationals (ODIs) and 5 070 hours for test matches. The injury prevalence was 4% per match, while the incidence of injury was 90 injuries per 10 000 hours of matches. Injuries occurred mostly to the lower limbs, back and trunk, upper limbs and head and neck. The injuries occurred primarily during test matches (43%), practices (20%) and practices and matches (19%). Acute injuries comprised 87% of the injuries. The major injuries during S1 were haematomas (20 %), muscle strains (14%) and other trauma (20%), while during S2 the injuries were primarily muscle strains (16%), other trauma (32%), tendinopathy (10%) and acute sprains (12%). The primary mechanisms of injury occurred when bowling (67%), on impact by the ball (batting – 65%, fielding – 26%) and when sliding for the ball (19%). Conclusion. The study provided prospective injury incidence and prevalence data for South African cricketers playing at international level over a two-season period, high-lighting the increased injury prevalence for away matches and an increased match injury incidence for test and ODI matches possibly as a result of increased match exposure time.

scholarly journals Accuracy of SEEG Electrodes Implanted in Lateral Position Versus Supine Position

Neurosurgery ◽  
2019 ◽  
Vol 66 (Supplement_1) ◽  
Author(s):  
Caio M Matias ◽  
Sandeep Kandregula ◽  
Chengyuan Wu ◽  
Ashwini D Sharan
Keyword(s):  
Supine Position ◽  
Three Dimensional ◽  
Major Complication ◽  
Lateral Position ◽  
Entry Point ◽  
Target Point ◽  
Robot Assisted ◽  
Dimensional Error ◽  
Electrode Implantation ◽  
Position Group

Abstract INTRODUCTION Accuracy during SEEG implantations is critical as several electrodes will cross narrow corridors between cerebral blood vessels. Previous studies have compared the accuracy of different techniques such as frame-based, frameless, and robot-assisted implantations and overall SEEG has been reported to be quite safe, with a major complication incidence of less than 1%. Typically, the supine position is utilized for implantation; however, the lateral position may be more comfortable and ergonomic for trajectories with a posterior entry point (eg, posterior approach to the insula). To our knowledge, this is the first study to compare the accuracy of SEEG electrodes implanted in supine position vs lateral position. METHODS About 22 patients who underwent SEEG electrode implantation using Leksell frame fixation and Neuromate robot were included in this study and clustered according to the supine (n = 11) or lateral (n = 11) position. A total of 284 electrodes (Supine: n = 139; Lateral: n = 145) were analyzed. Postoperative Oarm images were co-registered with the preoperative plan on Voxim software. Cartesian coordinates of the entry point (EP) and target point (TP) were obtained from the planned trajectory and the implanted electrode. Three-dimensional error (Euclidian distance) and radial error for EP and TP were calculated. Wilcoxon rank sum test was used to compare lateral versus supine group. RESULTS Radial errors were similar between both groups. EP three-dimensional error was higher in the lateral position group (1.3 mm vs 1.7 mm, P = .004), whereas TP three-dimensional error was higher in the supine position group (2.9 mm vs 1.8 mm, P < .001). CONCLUSION SEEG electrode implantation using frame-based fixation and robot-assisted technique in the lateral position has similar accuracy compared to implantation in the supine position.

scholarly journals 3D printed patient-specific aortic root models with internal sensors for minimally invasive applications

2020 ◽  
Vol 6 (35) ◽  
pp. eabb4641 ◽  
Author(s):  
Ghazaleh Haghiashtiani ◽  
Kaiyan Qiu ◽  
Jorge D. Zhingre Sanchez ◽  
Zachary J. Fuenning ◽  
Priya Nair ◽  
...  
Keyword(s):  
Minimally Invasive ◽  
Aortic Root ◽  
Three Dimensional ◽  
Sensor Arrays ◽  
Invasive Procedure ◽  
Patient Specific ◽  
Anatomical Site ◽  
Transcatheter Aortic Valve ◽  
Critical Regions

Minimally invasive surgeries have numerous advantages, yet complications may arise from limited knowledge about the anatomical site targeted for the delivery of therapy. Transcatheter aortic valve replacement (TAVR) is a minimally invasive procedure for treating aortic stenosis. Here, we demonstrate multimaterial three-dimensional printing of patient-specific soft aortic root models with internally integrated electronic sensor arrays that can augment testing for TAVR preprocedural planning. We evaluated the efficacies of the models by comparing their geometric fidelities with postoperative data from patients, as well as their in vitro hemodynamic performances in cases with and without leaflet calcifications. Furthermore, we demonstrated that internal sensor arrays can facilitate the optimization of bioprosthetic valve selections and in vitro placements via mapping of the pressures applied on the critical regions of the aortic anatomies. These models may pave exciting avenues for mitigating the risks of postoperative complications and facilitating the development of next-generation medical devices.

Common site of subchondral insufficiency fractures of the femoral head based on three-dimensional magnetic resonance imaging

2015 ◽  
Vol 45 (1) ◽  
pp. 105-113 ◽  
Author(s):  
Kenyu Iwasaki ◽  
Takuaki Yamamoto ◽  
Goro Motomura ◽  
Kazuyuki Karasuyama ◽  
Kazuhiko Sonoda ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Femoral Head ◽  
Three Dimensional ◽  
Insufficiency Fractures ◽  
Resonance Imaging ◽  
Common Site

scholarly journals Differences between native and prosthetic knees in trochlear groove tracking based on a morphometric measurement of three-dimensional reconstruction models in Chinese people

2020 ◽  
Author(s):  
Shi Chang Chen ◽  
Hua Xu ◽  
Shaohua Gong
Keyword(s):  
Cross Section ◽  
Three Dimensional ◽  
Lateral Position ◽  
Trochlear Groove ◽  
Dimensional Reconstruction ◽  
Total Knee ◽  
Three Dimensional Models ◽  
Prosthetic Knees ◽  
Tissue Tension ◽  
Patellofemoral Kinematics

Abstract Background Prosthetic trochlear design is important to ideal postoperative patellofemoral kinematics and knee function. But there has been little research on the differences of trochlear groove trackings between the native and prosthetic knees. We aimed to investigate the differences between native and prosthetic knees through the entire trochlear length by three-dimensional computerized quantification.Methods Virtual total knee arthroplasty was performed, using three-dimensional models of 42 healthy knees that were matched to the femoral components of five different prosthesis systems. Coaxial planes were created along the trochlear groove in 3° increments, and the deepest points of the trochlear groove were marked in each plane. Taking the lower extremity mechanical axis as reference line, the differences in the mediolateral location of the groove tracking were analyzed between the native and prosthetic knees.Results From the proximal to the distal end, the native tracking started from 0° cross section and extended laterally and then medially with its turning point located in 69° cross section, while the prosthetic knees showed medial orientation throughout the trochlear length. Compared with the proximal portion of the native tracking, the prosthetic trackings extended along a paradoxical orientation and started from a more proximal and lateral position, with maximal discrepancy to, 3.2 mm in the 0° cross section. Distally, the prosthetic trackings were located significantly medial, with maximal discrepancy, to 2.4 mm in the 69° cross section.Conclusion The prosthetic trochlear design varies among different types, and does not conform to that of the native knee in terms of shape, orientation, and location, which may cause soft tissue tension imbalance and abnormal patellofemoral biomechanics during knee flexion. This study may be helpful for prosthetic trochlear design that accords with native anatomy so as to optimize patellofemoral biomechanics and decrease the risk of patellofemoral complications.

scholarly journals Floodplains and paleosols in the Wyoming Eocene sequence: implications for the taphonomy and paleoecology of faunas

1992 ◽  
Vol 6 ◽  
pp. 31-31
Author(s):  
Thomas M. Bown ◽  
Mary J. Kraus ◽  
Andres Aslan
Keyword(s):  
Large Scale ◽  
Accumulation Rate ◽  
Sediment Accumulation ◽  
Three Dimensional ◽  
Lateral Position ◽  
National Geographic Society ◽  
Faunal Turnover ◽  
Fossil Vertebrate ◽  
Willwood Formation ◽  
Crevasse Splay

The Willwood Fm. of the southern Bighorn Basin of Wyoming, U.S.A., comprises 700 m of lower Eocene alluvial molasse, nearly all of which contains relict pedogenic features. These rocks are grouped into pedofacies–alluvial sediment prisms, thick with immature paleosols proximal to streams and thinner with mature paleosols distally. Pedofacies are bounded by either trunk-stream channel or crevasse-splay deposits, which represent time-stratigraphic markers. The floodplain widths of the Willwood rivers varied from 15 to 20+ km. Paleosols occur throughout the Willwood Formation and the most mature paleosols required about 60 Ka to form whereas the least mature, required 0.5 to 1.0 Ka. Paleosol thicknesses vary from about 0.3–8.0 m and are directly related to net sediment accumulation rate (NSAR) and profile maturity. Pedofacies also reflect NSAR controls; pedofacies are continuously superposed, 15–35-m-thick, and represent time intervals of 30–60 Ka.In the earliest Eocene, paleosol maturity rose sharply, and NSAR plummeted (Fort Union Fm./Willwood Fm. contact), after which maturity gradually declined (and NSAR rose) throughout the early Eocene. This decline was punctuated by two episodes of severe decline, each corresponding with major increases in NSAR, increased tectonism, and episodes of faunal turnover (“Biohorizons” A and B). Above the biohorizons, species earlier tied to particular paleosol maturities were replaced by closely related though more generalized species with no marked paleosol preferences. Time-stratigraphic reconstruction of the Willwood Fm. shows that “Biohorizons” B and C record the same faunal event; B the extinctions, and C the immigrations.The 1,300 Willwood fossil vertebrate localities, which are distributed throughout the entire formation, occur in the surface horizons of cumulative alluvial paleosols. All fossil accumulations in paleosols are attritional and formed during pedogenesis. The most complete remains occur in immature paleosols, whereas the most abundant remains are found in mature paleosols. Within the large-scale Willwood ecologic setting, studies of discrete (m's to tens of m's thick) stratigraphic intervals suggest that the paleontology and sedimentology of these intervals can be significantly influenced by lateral differences in paleosol hydromorphy (soil wetness) and maturity (lateral position of a fossil-bearing paleosol with respect to an ancient river channel). These smaller-scale controls on fossil occurrences are important for distinguishing between real and apparent changes in faunal compositions over time and emphasize the value of three-dimensional stratigraphic analysis for interpreting paleontologic events.Supported by National Geographic Society grant 3985-89.

Sign in / Sign up

Export Citation Format

Share Document