scholarly journals The Use of a Single Trunk-Mounted Accelerometer to Detect Changes in Center of Mass Motion Linked to Lower-Leg Overuse Injuries: A Prospective Study

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 7385
Author(s):  
Gerard Aristizábal Pla ◽  
Enzo Hollville ◽  
Kurt Schütte ◽  
Benedicte Vanwanseele
Keyword(s):  
Dynamic Stability ◽  
Dynamic Loading ◽  
Center Of Mass ◽  
Vertical Direction ◽  
Lower Leg ◽  
Overuse Injuries ◽  
Mass Motion ◽  
Movement Dynamics ◽  
History Of ◽  
A Prospective Study

Movement dynamics during running was previously characterized using a trunk-mounted accelerometer, and were associated with a history of overuse injuries. However, it remains unknown if these measures are also linked to the development of overuse injuries. The aim of this study was therefore to determine how movement dynamics alter in response to fatigue, and the possible link with developing lower-leg overuse injuries during a six-month follow-up period. Two hundred and eight movement science university students completed a 12-min all-out run while wearing a trunk-mounted accelerometer. Dynamic stability, dynamic loading and spatiotemporal measures were extracted from the accelerometer. Participants sustaining an injury within the 6-month period demonstrated significantly higher RMS ratio values in the vertical direction and lower RMS ratio values in the anteroposterior direction, and lower impact acceleration values in the anteroposterior direction in an unfatigued state compared to the uninjured group. They also demonstrated an increase in dynamic loading in the horizontal plane during the run. In addition, with running fatigue both groups exhibited changes in dynamic stability and loading measures. These results show the potential of using a single trunk-mounted accelerometer to detect changes in movement dynamics that are linked to lower-leg overuse injuries.

scholarly journals Relationship of footwear comfort, selected size, and lower leg overuse injuries among infantry soldiers

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Darja Nesterovica ◽  
Normunds Vaivads ◽  
Ainars Stepens
Keyword(s):  
Service Time ◽  
Overuse Injury ◽  
Lower Leg ◽  
Cross Sectional Study ◽  
Overuse Injuries ◽  
Cross Sectional ◽  
Shoe Size ◽  
Study Results ◽  
History Of ◽  
Footwear Comfort

Abstract Background High rates of musculoskeletal injuries such as plantar fasciitis and stress fractures have been observed among physically active military personnel. During service time, infantry soldiers use issued boots daily that should fit well and provide comfort to prevent injuries and decrease lower extremity pain effectively. The association of military boot comfort with overuse injuries remains unclear. This study investigates the relationship between the chosen military boot size, perceived boot comfort and lower leg overuse injury. Methods During the cross-sectional study, 227 (males, n = 213; females, n = 14) active-duty infantry soldiers at a mean age of 29.5 years old, and with an average service time of 7.2 years were assessed for a history of overuse injury, footprint length, appropriate shoe size, and footwear comfort. Males with a history of overuse injury (n = 32) and non-injured age-matched controls (n = 34) were selected for detailed testing and establishing the possible relationship between footwear comfort and lower leg overuse injury. Results No relationship was found between footwear comfort and a history of lower leg overuse injury. N = 38 (57.6%) of study subjects were wearing an inappropriate shoe size daily. Inappropriate shoe size usage affected footwear comfort ratings significantly. Conclusions Study results showed that improper boot size was significantly related to comfort ratings but was not associated with a history of lower leg overuse injury.

Control of Body's Center of Mass Motion During Level Walking and Obstacle-Crossing in Older Patients with Knee Osteoarthritis

2010 ◽  
Vol 26 (2) ◽  
pp. 229-237 ◽  
Author(s):  
W.-C. Hsu ◽  
T.-M. Wang ◽  
M.-W. Liu ◽  
C.-F. Chang ◽  
H.-L. Chen ◽  
...  
Keyword(s):  
Knee Osteoarthritis ◽  
Dynamic Stability ◽  
Sagittal Plane ◽  
Center Of Pressure ◽  
Center Of Mass ◽  
Mass Motion ◽  
Obstacle Crossing ◽  
Knee Oa ◽  
Level Walking ◽  
Increased Risk

AbstractKnee osteoarthritis (OA) has been reported to affect the performance of ambulation, including unobstructed and obstructed gait. An increased risk of falling in patients with knee OA during obstaclecrossing, as opposed to unobstructed level walking, may be explained by the difference in the control of the body's center of mass (COM) with respect to the center of pressure (COP) while trying to ensure sufficient foot clearance. The purpose of the study was to investigate the dynamic stability in patients with knee OA during level walking and obstacle-crossing. The COM-COP inclination angles and angular velocities, as well as temporal-spatial variables, from eleven patients with bilateral knee OA and eleven normal controls were obtained during level walking and obstacle-crossing using a three-dimensional motion analysis system and forceplates. Demands in the control of the COM relative to the COP were found to be greater during obstacle-crossing in both subject groups. While less stable COM control was found around the end stage of double stance phase during obstacle-crossing when compared to level walking, patients with knee OA successfully acquired strategies in the sagittal plane to maintain close-tonormal stable COM control with normal toe clearances during both level walking and obstacle-crossing. They achieved stable transitions from single limb stance (SLS) to double limb stance (DLS) through a reduced anterior inclination angle and from DLS to SLS through increased anterior angular velocity. It is suggested that assessment of the ability to control dynamic stability in patients with knee OA should consider both the positions and velocities of the COM and COP.

A prospective study on gait-related intrinsic risk factors for lower leg overuse injuries

2009 ◽  
Vol 43 (13) ◽  
pp. 1057-1061 ◽  
Author(s):  
N G. Z. Hesar ◽  
A Van Ginckel ◽  
A Cools ◽  
W Peersman ◽  
P Roosen ◽  
...  
Keyword(s):  
Risk Factors ◽  
Prospective Study ◽  
Lower Leg ◽  
Overuse Injuries ◽  
A Prospective Study

EFFECTS OF KNEE OSTEOARTHRITIS ON BODY'S CENTER OF MASS MOTION IN OLDER ADULTS DURING LEVEL WALKING

2010 ◽  
Vol 22 (03) ◽  
pp. 205-212 ◽  
Author(s):  
Ting-Ming Wang ◽  
Wei-Chun Hsu ◽  
Chu-Fen Chang ◽  
Chih-Chung Hu ◽  
Tung-Wu Lu
Keyword(s):  
Knee Osteoarthritis ◽  
Dynamic Stability ◽  
Sagittal Plane ◽  
Center Of Pressure ◽  
Center Of Mass ◽  
Frontal Plane ◽  
Mass Motion ◽  
Knee Oa ◽  
Level Walking ◽  
Normal Controls

Knowledge of the control of the body's dynamic stability in patients with knee osteoarthritis (OA) is helpful for the management of these patients and for the evaluation of treatment outcomes. The purpose of the current study was to investigate the dynamic stability of patients with knee OA during level walking using variables describing the motion of the body's center of mass (COM) and its relationship to the center of pressure (COP). Kinematic and kinetic data during level walking were obtained from 10 patients with bilateral knee OA and 10 normal controls using a motion analysis system and two forceplates. Compared to the normal controls, patients with knee OA exhibited normal COM positions and velocities at key instances of gait but with significant changes in COM accelerations. In the sagittal plane, adjustments to the anterioposterior acceleration of the COM throughout the complete gait cycle were needed for better control of the COM during the more challenging latter half of single leg stance. Diminished A/P COM–COP separation was also used to maintain body stability with reduced joint loadings. In the frontal plane, this was achieved by increasing the acceleration of the body's COM towards the stance leg. The more jerky motion of the body's COM observed may be a result of reduced ability associated with knee OA in the control of the motion of the COM. Strengthening of the muscles of the lower extremities, as well as training of the control of the COM through a dynamic balance training program, are equally important for the dynamic stability of patients with knee OA.

scholarly journals Ectopic pregnancy in a tertiary care centre of Jharkhand, India

2019 ◽  
Vol 8 (8) ◽  
pp. 2969
Author(s):  
Meetali Parashar ◽  
Meena Mehta
Keyword(s):  
Ectopic Pregnancy ◽  
Clinical Presentation ◽  
Previous History ◽  
First Trimester ◽  
Near Miss ◽  
Obstetrics And Gynaecology ◽  
Maternal Morbidity And Mortality ◽  
History Of ◽  
Β Hcg ◽  
A Prospective Study

Background: Ectopic pregnancy is one in which the fertilized ovum is implanted and develops outside the endometrial cavity. It is an important cause of maternal morbidity and mortality in first trimester. The present study was conducted to study the risk factors, clinical presentation and management of ectopic pregnancy in RIMS, Ranchi, Jharkhand, India.Methods: This was a prospective study conducted in the department of obstetrics and gynaecology, RIMS, Ranchi, Jharkhand during May 2017 to September 2018. A total of 90 cases were included in the study.Results: 80% of the patients presented with amenorrhoea, 98% had abdominal pain and 69% had vaginal bleeding. Ultrasonography revealed hemoperitoneum in about 93% patients. 16 (18%) patients had history of infertility whereas 10 patients (11%) had taken treatment of infertility.6 (7%) patients had history of STD or PID.14 (16%) had undergone bilateral tubectomy.2 (2%) had history of IUCD insertion and 12 (13%) patients had undergone previously lscs. 54 patients (60%) had undergone D and C and 6 patients (7%) had a previous history of ectopic pregnancy. 68 (76%) underwent only salpingectomy.12 (13%) had salpingo-oophorectomy and 10 (11%) had salpingectomy with contralateral tubectomy.Conclusions:Diagnosis of ectopic pregnancy requires clinical suspicion and supportive investigations like UPT, ultrasonography, β HCG and laparoscopy. It is an important cause of admission to RIMS as maternal near miss cases.Background: Ectopic pregnancy is one in which the fertilized ovum is implanted and develops outside the endometrial cavity. It is an important cause of maternal morbidity and mortality in first trimester. The present study was conducted to study the risk factors, clinical presentation and management of ectopic pregnancy in RIMS, Ranchi, Jharkhand, India.Methods: This was a prospective study conducted in the department of obstetrics and gynaecology, RIMS, Ranchi, Jharkhand during May 2017 to September 2018. A total of 90 cases were included in the study.Results: 80% of the patients presented with amenorrhoea, 98% had abdominal pain and 69% had vaginal bleeding. Ultrasonography revealed hemoperitoneum in about 93% patients. 16 (18%) patients had history of infertility whereas 10 patients (11%) had taken treatment of infertility.6 (7%) patients had history of STD or PID.14 (16%) had undergone bilateral tubectomy.2 (2%) had history of IUCD insertion and 12 (13%) patients had undergone previously lscs. 54 patients (60%) had undergone D and C and 6 patients (7%) had a previous history of ectopic pregnancy. 68 (76%) underwent only salpingectomy.12 (13%) had salpingo-oophorectomy and 10 (11%) had salpingectomy with contralateral tubectomy.Conclusions: Diagnosis of ectopic pregnancy requires clinical suspicion and supportive investigations like UPT, ultrasonography, β HCG and laparoscopy. It is an important cause of admission to RIMS as maternal near miss cases.

Dynamic Loading on Turbofan Blades Due to Bird-Strike

2011 ◽  
Vol 133 (12) ◽  
Author(s):  
Sunil K. Sinha ◽  
Kevin E. Turner ◽  
Nitesh Jain
Keyword(s):  
Dynamic Loading ◽  
Time History ◽  
Material Model ◽  
Bird Strike ◽  
Dynamical Equations ◽  
Nonlinear Dynamical ◽  
History Of ◽  
Measured Strain ◽  
Dynamic Loading Condition ◽  
Fan Blade

In the present paper, a hydrodynamic bird material model made up of water and air mixture is developed, which produces good correlation with the measured strain-gauge test data in a panel test. This parametric bird projectile model is used to generate the time-history of the transient dynamic loads on the turbofan engine blades for different size birds impacting at varying span locations of the fan blade. The problem is formulated in 3D vector dynamics equations using a nonlinear trajectory analysis approach. The analytical derivation captures the physics of the slicing process by considering the incoming bird in the shape of a cylindrical impactor as it comes into contact with the rotating fan blades modeled as a pretwisted plate with a camber. The contact-impact dynamic loading on the airfoil produced during the bird-strike is determined by solving the coupled nonlinear dynamical equations governing the movement of the bird-slice in time-domain using a sixth-order Runge-Kutta technique. The analytically predicted family of load time-history curves enables the blade designer to readily identify the critical impact location for peak dynamic loading condition during the bird-ingestion tests mandated for certification by the regulatory agencies.

scholarly journals Prevalence and echo features of mediastinal lymph nodes in EUS for non-malignant indications: a prospective study in a Southern European Population

2018 ◽  
Vol 06 (04) ◽  
pp. E432-E436
Author(s):  
Joana Carmo ◽  
Miguel Bispo ◽  
Susana Marques ◽  
Cristina Chagas
Keyword(s):  
Lymph Nodes ◽  
European Population ◽  
Significant Heterogeneity ◽  
Mediastinal Lymph Nodes ◽  
Single Center Study ◽  
History Of ◽  
Echo Features ◽  
Portuguese Study ◽  
A Prospective Study ◽  
Ct Studies

Abstract Background and study aims Significant heterogeneity in geographic distribution regarding the prevalence of mediastinal lymph nodes (MLN) has been documented in autopsy and computed tomography (CT) studies. Awareness of the local prevalence and characteristics of lymph nodes will be relevant when performing endoscopic ultrasonography (EUS) for staging of malignant neoplasias. The aims of this study were to document the prevalence and echo features of MLN in patients undergoing EUS for non-malignant extrathoracic disease and to identify predictive factors for the presence of MLN. Patients and methods A prospective single-center study was performed over 6 months. Mediastinal stations 9, 8, 7, 6, 5, 4 L and 2 were systematically evaluated using a linear echoendoscope in all patients undergoing EUS due to benign extrathoracic pathology and without history of oncologic disease. Demographic, clinical and EUS features of the lymph nodes were analysed. Results Seventy-five patients were included: male/female 32/43; mean age, 63 years. The majority of patients (72 %) had lymph nodes in at least one mediastinal station and 88 % of these were found in stations 7 or 4 L. Overall, 133 MLN were identified: 19 % were hypoechogenic, 6 % had a short-axis diameter > 10 mm, and 6 % were round. The prevalence of lymph nodes was higher in smokers (83 % vs 64 %, P = 0.024), with a higher average number of lymph nodes per patient in this group (2.1 vs 1.6; P = 0.017). By logistic regression analysis, none of the variables analyzed were independently associated with the presence of MLN. Conclusion This prospective Portuguese study documented a higher prevalence of MLN than previously reported in Northern Europe, in patients with no evidence of oncologic disease. This higher prevalence may negatively influence the specificity and positive predictive value for malignancy of MLN (N) staging by EUS.

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