scholarly journals Are metric parameters sufficient alone in evaluation of the patellar instability? New angular measuring parameters

2017 ◽  
Vol 25 (1) ◽  
pp. 230949901668449 ◽  
Author(s):  
Alper Deveci ◽  
Deniz Cankaya ◽  
Serdar Yilmaz ◽  
Ersin Celen ◽  
Bulent Sakman ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Strong Correlation ◽  
Patellar Instability ◽  
Pearson Correlation ◽  
Trochlear Groove ◽  
Rotational Movement ◽  
Pearson Correlation Test ◽  
Angular Measuring ◽  
Metric Measurement ◽  
Tibia Shaft

Purposes: When the evaluation of patellar instability is examined from the aspect of the conical-cylindrical anatomy of the tibia, metric measurement parameters such as the tuberositas tibia (TT)–trochlear groove (TG) and patellar tendon (PT) insertion–trochlear groove (TG) distances are not sufficient. We asked whether defined angular parameters reveal the rotational movement of the tuberositas tibia on the tibia shaft, additional to the metric parameters and there is a correlation between the metric and angular parameters. Methods: 19 patients with patellar instability and 22 patients without patellar instability were evaluated. For all patients, two angle and three length parameters were evaluated on the slices taken. Evaluations were made of the TT-TG, the midpoint of the PT insertion-TG distances, the anatomic midpoint of the dome of the TT-TG, the TG-PT angle, and the TG-dome angle (DA). The Pearson correlation test was used for the statistical analysis of correlations between groups. Results: A statistically significant increase was determined in the patellar instability group in the TG-DA and TG-PT angle values compared to the group without patellar instability ( p < 0.05). In both groups, a positive and strong correlation was determined between the TT-TG and the TG-PT and dome of the TT-TG distances, but no statistically significant correlation was determined between the tuberositas TT-TG and TG-PT angle and TG-DA. Conclusion: Metric parameters may not be sufficient alone in the evaluation of patellar instability. Metric parameters should be supported by additional angular parameters which reveal the rotational movement of the TT on the tibia shaft.

scholarly journals Utility of Merchant View Radiographs for Assessment of TT-TG: A Comparison to MRI

2018 ◽  
Vol 6 (7_suppl4) ◽  
pp. 2325967118S0007 ◽  
Author(s):  
David Bernholt ◽  
Joseph D. Lamplot ◽  
Eric Eutsler ◽  
Jeffrey J. Nepple
Keyword(s):  
Patellar Instability ◽  
Interobserver Reliability ◽  
Pearson Correlation ◽  
Tibial Tubercle ◽  
Power Calculation ◽  
Trochlear Groove ◽  
Pearson Correlation Coefficient ◽  
Strongly Correlated ◽  
Radiographic Assessment ◽  
Bony Landmarks

Objectives: Lateralization of the tibial tubercle plays a significant role in the pathophysiology of patellar instability and is most often assessed by the tibial tubercle to trochlear groove distance (TT-TG) measured on CT or MRI with the knee in extension. However, tracking of the patella in 30 to 45 degrees of flexion has been suggested to be of greater clinical significance. Merchant radiographs can demonstrate the position of the tibial tubercle relative to the trochlear groove in this range of flexion and thus may serve as a valuable tool in the assessment of patellar tracking. The purpose of the current study was (1) to validate radiographic assessment of the merchant view TT-TG and (2) to determine the correlation with MRI-based measurements. Methods: To validate Merchant TT-TG as a marker of the position of the tibial tubercle, 41 patients between the ages of 10-18 had standardized Merchant radiographs in 45 degrees flexion yielding imaging of 82 knees. Lead markers were placed upon the skin centered over the tibial tubercle based on palpation. Radiographs were collected and analyzed. The TT-TG was measured as the distance between lines centered over the deepest point of the trochlear groove and the center of the tibial tubercle and perpendicular to the anterior condylar axis. In order to correlate Merchant TT-TG to MRI TT-TG, 16 additional patients were added to reach a total of 30 patients with a Merchant radiograph and MRI, as power calculation determined 29 knees needed to detect a Pearson correlation coefficient (PCC) of .500. There was excellent interobserver reliability between two readers for Merchant TT-TG with and without use of a radiographic marker (ICC = .975 and .923 respectively). Results: The tibial tubercle could be identified on Merchant radiograph in 67 images (81.7%). Merchant TT-TG measured with use of a marker was very strongly correlated measurement based on bony landmarks alone (PCC = .848). The Merchant TT-TG measured with bony landmarks alone was strongly correlated to MRI TT-TG (PCC = .602). The strength of this correlation was increased by standardizing TT-TG by patellar width (PCC = .710). MRI TT-TG was increased in patients with patellar instability at 13.9 mm compared to 10.5 mm (p <.01); Merchant TT-TG was also increased in patients with patellar instability at 9.1 mm compared to 1.9 mm (p < .001). Conclusion: Standardized Merchant radiographs without radiographic markers allow for assessment of TT-TG in the majority of patients. Merchant TT-TG strongly correlates with MRI TT-TG but measured 5-8 mm smaller than MRI TT-TG.

scholarly journals Healthy Household and Complete Basic Immunization as A Risk for Causes of Toddler Pneumonia in Jember Regency: Correlation Study

2020 ◽  
Vol 12 (1) ◽  
pp. 30
Author(s):  
Vina Hariasih Mulyani
Keyword(s):  
Data Analysis ◽  
Health Center ◽  
Strong Correlation ◽  
Pearson Correlation ◽  
Secondary Data ◽  
Local Health ◽  
Health Profile ◽  
Pearson Correlation Test ◽  
Independent Variable ◽  
Local Health Center

Introduction: Pneumonia leads to inflammation of the lungs which causes by microorganisms such as parasites, bacteria, viruses, and fungi. This research was conducted to describe the strong correlation between the achievement of healthy household and complete basic immunization with toddler pneumonia cases in Jember Regency in 2016. Method: A secondary data analysis, this research applied correlation research design. The data was obtained from the Health Profile of Jember Regency in 2016 in the form of data on cases of toddler pneumonia, data on healthy household and complete basic immunization. The variables studied were the achievement of a healthy household and complete basic immunization as the dependent variable and cases of toddler pneumonia at every local health center in all sub-districts in Jember Regency as an independent variable. The data collected were then analyzed using the Pearson correlation test. Result and Discussion: A secondary data analysis, this research applied correlation research design. The data was obtained from the Health Profile of Jember Regency in 2016 in the form of data on cases of toddler pneumonia, data on healthy household and complete basic immunization. The variables studied were the achievement of a healthy household and complete basic immunization as the dependent variable and cases of toddler pneumonia at every local health center in all sub-districts in Jember Regency as an independent variable. The data collected were then analyzed using the Pearson correlation test. Conclusion: The research found that with pneumonia, there were more male sufferer than female. There was also a strong correlation found between the achievement of healthy household and complete basic immunization with cases of toddler with pneumonia in Jember Regency. Supervision of healthy household by the local government needs to be improved. The role of family, the surrounding environment, and the local government on the importance of providing complete basic immunizations for toddlers in the community also must be improved.

Coágulo sanguíneo: uma opção NÃO viável para a preservação alveolar

2021 ◽  
Vol 12 (46) ◽  
pp. 24-31
Author(s):  
Renata Silveira Sagnori ◽  
Bruno Costa Martins de Sá ◽  
Claudio Ferreira Nóia
Keyword(s):  
Computed Tomography ◽  
Statistical Analysis ◽  
Dental Implants ◽  
Pearson Correlation ◽  
Cone Beam ◽  
Alveolar Process ◽  
Significance Level ◽  
Dimensional Changes ◽  
Pearson Correlation Test ◽  
Natural Healing

The loss of dental elements leads to an intense remodeling of the alveolar process, resulting in important dimensional changes, which often make it difficult to install dental implants. Considering this, the objective of the present study was to evaluate the changes in height and thickness that occurred in dental alveoli after extraction. For this, 10 patients were evaluated and submitted to extraction of dental elements and followed up in the postoperative period in which there was natural healing. Cone beam computed tomography were obtained preoperatively and 3 months postoperatively and were used as a basis for assessing loss of height and thickness that occurred. Pearson correlation test with a significance level of 5% was used to assess dimensional changes. The results showed that vertical loss (average of 2.99 mm) was greater than the horizontal loss (average of 2.52 mm). The statistical analysis pointed out the existence of a very good and significant correlation between these bone losses and also revealed that the higher the loss of height, the greater the loss of thickness. In 8 of 10 patients in the sample, some grafting was necessary prior to the installation of the implants, thus increasing morbidity and time of treatment. Considering this, it was concluded that the clot was not a viable alternative for alveolar preservation aiming posterior installation of dental implants.

scholarly journals KORELASI ANTARA INTERVAL S2-OPENING SNAP DAN MITRAL VALVE AREA YANG DIIDENTIFIKASI DENGAN COLOR SPECTROGRAPH PHONOCARDIOGRAPHY PADA PASIEN MITRAL STENOSIS

2013 ◽  
Vol 5 (2) ◽  
Author(s):  
Iman Y. Suhartono ◽  
Terrance Ransun ◽  
Michael S. Kawilarang ◽  
Elfan Moeljono ◽  
Fonny M. Tedjo ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Mitral Valve ◽  
Strong Correlation ◽  
Mitral Stenosis ◽  
Pearson Correlation ◽  
Heart Sounds ◽  
Strongly Correlated ◽  
Mitral Valve Area ◽  
Pearson Correlation Test ◽  
Valve Area

Abstract: Color spectrograph phonocardiography (CSP) is a method for recording heart sounds by using a digital stethoscope. The recorded result can be analyzed by using a soft ware. CSP can identify the opening snap (OS) and measure the S2-OS interval. This study aimed to determine the correlation between adjusted S2-OS to the mitral valve area (MVA) in mitral stenosis (MS) patients. The samples were MS patients admitted to the ICCU and the ward of Prof. Dr. R.D. Kandou Hospital, Manado. Patients with atrial fibrillation were excluded. Every patient underwent echocardiography and CSP to obtain the MVA and S2-OS interval. The adjusted S2-OS interval is the S2-OS interval divided by the number of heart beats (milisecond/beat per minute). Variables were analyzed by using the Pearson correlation test. The results showed that there were 14 MS patients involved in this study. There was a strong correlation between adjusted S2-OS interval and MVA. Estimated MVA was obtained by using the formula MVA = -1.358 + 2.07. Conclusion: The adjusted S2-OS interval was strongly correlated to the MVA of MS Patients and could predict the MVA value. Keywords: color spectrograph phonocardiography, S2-OS interval, mitral valve area, mitral stenosis, echocardiography.   Abstrak: Color spectrograph phonocardiography (CSP) merupakan metode merekam bunyi jantung dengan menggunakan stetoskop digital. Hasil rekaman ini dapat dianalisis dengan piranti lunak. CSP dapat mengidentifikasi opening snap (OS) dan mengukur interval S2 – OS. Penelitian ini bertujuan untuk mendeteksi korelasi antara interval S2-OS yang sudah disesuaikan dengan mitral valve area (MVA) pada pasien mitral stenosis (MS). Sampel penelitian ialah pasien mitral stenosis yang dirawat di ICCU dan bangsal BLU RSUP Prof. Dr. R.D. Kandou Manado. Pasien dengan atrial fibrilasi dieksklusi. Masing-masing pasien menjalani pemeriksaan echocardiography dan CSP untuk memperoleh MVA dan interval S2-OS. Interval S2-OS yang telah disesuaikan adalah interval S2-OS yang dibagi dengan denyut jantung (milidetik/denyut jantung per menit). Variabel-variabel tersebut dianalisis dengan menggunakan analisis korelasi Pearson. Hasil penelitian memperlihatkan  sebanyak 14 pasien mitral stenosis diikutsertakan dalam penelitian. Terdapat korelasi sangat kuat antara interval S2-OS yang telah disesuaikan dengan MVA. Estimasi MVA dapat diperoleh dari persamaan MVA = -1,358 + 2,07.(Interval S2-OS yang telah disesuaikan). Simpulan: Interval S2-OS yang telah disesuaikan memiliki korelasi yang sangat kuat dengan MVA pada pasien-pasien mitral stenosis. Interval S2-OS yang telah disesuaikan dapat memperkirakan nilai MVA. Kata kunci: color spectrograph phonocardiography, interval S2-OS, mitral valve area, mitral stenosis, echocardiography.

FULL WEIGHT BEARING KINEMATIC MRI STUDY OF TT-TG DISTANCE: COMPARING PATIENTS WITH PATELLOFEMORAL PAIN TO HEALTHY INDIVIDUALS

2015 ◽  
Vol 21 (4.1) ◽  
pp. 638-642
Author(s):  
Andrius Brazaitis ◽  
Algirdas Tamosiunas ◽  
Janina Tutkuviene
Keyword(s):  
Patellar Instability ◽  
Weight Bearing ◽  
Patellofemoral Pain ◽  
Full Weight Bearing ◽  
Trochlear Groove ◽  
Patellar Tilt ◽  
Full Extension ◽  
Low Degrees ◽  
Mri Study ◽  
Kinematic Magnetic Resonance Imaging

Purpose. The aim of the present study was to investigate tibial tuberosity-trochlear groove (TT-TG) distance dynamics in patients with patellofemoral pain (PFP) and pain free individuals by using full weight bearing kinematic magnetic resonance imaging (MRI) And correlation with patellar instability. Materials and methods. 51 female individuals with PFP and 26 pain free female individuals participated in the study. The kinematic MRI was performed with 1,5 T MRI unit and full-weight bearing. TT-TG distance, bissect offset (BSO) and patellar tilt angle (PTA) were measured in steps of 10° between 50° of flexion to full extension. Results. The TT–TG was higher in PFP patients compared to volunteers’ from 40° to full extension. This difference was statistically significant (p<0.01). PFP patients demonstrated statistically significantly greater TT-TG distance increase from 30° to full extension. BSO and PTA were moderately correlated to TT-TG from 20° of flexion to full extension. Conclusion. TT-TG distance is dynamic and increases significantly during extension in patients with PFP and pain free individuals, depending on knee flexion angle. It shows different pattern of dynamics in PFP group. TT-TG distance is associated with patellar instability (BSO and PTA) at low degrees of flexion.

scholarly journals The patellofemoral morphology and the normal predicted value of tibial tuberosity-trochlear groove distance in the Chinese population

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Zhe Li ◽  
Guanzhi Liu ◽  
Run Tian ◽  
Ning Kong ◽  
Yue Li ◽  
...  
Keyword(s):  
Individual Differences ◽  
Chinese Population ◽  
Pearson Correlation ◽  
Three Dimensional ◽  
Correlation Coefficients ◽  
Tibial Tuberosity ◽  
Trochlear Groove ◽  
Lasso Regression ◽  
Cross Sectional ◽  
Anterior Posterior

Abstract Background Our objective was to obtain normal patellofemoral measurements to analyse sex and individual differences. In addition, the absolute values and indices of tibial tuberosity-trochlear groove (TT-TG) distances are still controversial in clinical application. A better method to enable precise prediction is still needed. Methods Seventy-eight knees of 78 participants without knee pathologies were included in this cross-sectional study. A CT scan was conducted for all participants and three-dimensional knee models were constructed using Mimics and SolidWorks software. We measured and analysed 19 parameters including the TT-TG distance and dimensions and shapes of the patella, femur, tibia, and trochlea. LASSO regression was used to predict the normal TT-TG distances. Results The dimensional parameters, TT-TG distance, and femoral aspect ratio of the men were significantly larger than those of women (all p values < 0.05). However, after controlling for the bias from age, height, and weight, there were no significant differences in TT-TG distances and anterior-posterior dimensions between the sexes (all p values > 0.05). The Pearson correlation coefficients between the anterior femoral offset and other indexes were consistently below 0.3, indicating no relationship or a weak relationship. Similar results were observed for the sulcus angle and the Wiberg index. Using LASSO regression, we obtained four parameters to predict the TT-TG distance (R2 = 0.5612, p < 0.01) to achieve the optimal accuracy and convenience. Conclusions Normative data of patellofemoral morphology were provided for the Chinese population. The anterior-posterior dimensions of the women were thicker than those of men for the same medial-lateral dimensions. More attention should be paid to not only sex differences but also individual differences, especially the anterior condyle and trochlea. In addition, this study provided a new method to predict TT-TG distances accurately.

scholarly journals Comparing the Tibial Tuberosity–Trochlear Groove Distance Between CT and MRI in Skeletally Immature Patients With and Without Patellar Instability

2021 ◽  
Vol 9 (1) ◽  
pp. 232596712097366
Author(s):  
Zhen-Zhen Dai ◽  
Lin Sha ◽  
Zi-Ming Zhang ◽  
Zhen-Peng Liang ◽  
Hao Li ◽  
...  
Keyword(s):  
Patellar Instability ◽  
Intraclass Correlation ◽  
Mean Difference ◽  
Tibial Tubercle ◽  
Control Group ◽  
Trochlear Groove ◽  
Skeletally Immature ◽  
Bony Landmarks ◽  
The Difference ◽  
Ct And Mri

Background: The tibial tubercle–trochlear groove (TT-TG) distance was originally described for computed tomography (CT), but it has been measured on magnetic resonance imaging (MRI) in patients with patellar instability (PI). Whether the TT-TG measured on CT versus MRI can be considered equivalent in skeletally immature children remains unclear. Purpose: To investigate in skeletally immature patients (1) the effects of CT versus MRI imaging modality and cartilage versus bony landmarks on consistency of TT-TG measurement, (2) the difference between CT and MRI measurements of the TT-TG, and (3) the difference in TT-TG between patients with and without PI. Study Design: Cross-sectional study; Level of evidence, 3. Methods: We retrospectively identified 24 skeletally immature patients with PI and 24 patients with other knee disorders or injury but without PI. The bony and cartilaginous TT-TG distances on CT and MRI were measured by 2 researchers, and related clinical data were collected. The interrater, interperiod (bony vs cartilaginous), and intermethod (CT vs MRI) reliabilities of TT-TG measurement were assessed with intraclass correlation coefficients. Results: The 48 study patients (19 boys, 29 girls) had a mean age of 11.3 years (range, 7-14 years). TT-TG measurements had excellent interrater reliability and good or excellent interperiod reliability but fair or poor intermethod reliability. TT-TG distance was greater on CT versus MRI (mean difference, 4.07 mm; 95% CI, 2.6-5.5 mm), and cartilaginous distance was greater than bony distance (mean difference, 2.3 mm; 95% CI, 0.79-3.8 mm). The TT-TG measured on CT was found to increase with the femoral width. Patients in the PI group had increased TT-TG distance compared with those in the control group, regardless of landmarks or modality used ( P > .05 for all). Conclusion: For skeletally immature patients, the TT-TG distance could be evaluated on MRI, regardless of whether cartilage or bony landmarks were used. Its value could not be interchanged with CT according to our results; however, further research on this topic is needed.

scholarly journals Statistical Analysis and Machine Learning Prediction of Fog-Caused Low-Visibility Events at A-8 Motor-Road in Spain

Atmosphere ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 679
Author(s):  
Sara Cornejo-Bueno ◽  
David Casillas-Pérez ◽  
Laura Cornejo-Bueno ◽  
Mihaela I. Chidean ◽  
Antonio J. Caamaño ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Probability Distributions ◽  
Pearson Correlation ◽  
Likelihood Method ◽  
Neural Network Approach ◽  
Event Duration ◽  
Full Characterization ◽  
Low Visibility ◽  
Learning Machine ◽  
The Impact

This work presents a full statistical analysis and accurate prediction of low-visibility events due to fog, at the A-8 motor-road in Mondoñedo (Galicia, Spain). The present analysis covers two years of study, considering visibility time series and exogenous variables collected in the zone affected the most by extreme low-visibility events. This paper has then a two-fold objective: first, we carry out a statistical analysis for estimating the fittest probability distributions to the fog event duration, using the Maximum Likelihood method and an alternative method known as the L-moments method. This statistical study allows association of the low-visibility depth with the event duration, showing a clear relationship, which can be modeled with distributions for extremes such as Generalized Extreme Value and Generalized Pareto distributions. Second, we apply a neural network approach, trained by means of the ELM (Extreme Learning Machine) algorithm, to predict the occurrence of low-visibility events due to fog, from atmospheric predictive variables. This study provides a full characterization of fog events at this motor-road, in which orographic fog is predominant, causing important traffic problems during all year. We also show how the ELM approach is able to obtain highly accurate low-visibility events predictions, with a Pearson correlation coefficient of 0.8, within a half-hour time horizon, enough to initialize some protocols aiming at reducing the impact of these extreme events in the traffic of the A-8 motor road.

scholarly journals Are Saliva Tests Important in the Prediction of Carious Disease?

2021 ◽  
Vol 11 (13) ◽  
pp. 5932
Author(s):  
Daniela Luminita Ichim ◽  
Liliana Sachelarie ◽  
Alexandra Burlui
Keyword(s):  
Health Promotion ◽  
Pearson Correlation ◽  
Coefficient Of Determination ◽  
Data Series ◽  
Study Group ◽  
Complex Phenomenon ◽  
Oral Health Promotion ◽  
Group 4 ◽  
Carious Lesions ◽  
Pearson Correlation Test

(1) Background: The appearance and progression of carious lesions represent a complex phenomenon of interactions of microbial factors (the action of bacteria on the tooth), of the factors related to the host, to the diet, and to the time factor. Which hasan influence on the rate of microbismof the oral cavity on the installation of carious disease? (2) Methods: In order to correctly assess the cariogenic risk of an individual, it is recommended to perform twoor more tests based on different principles (microbiological, clinical, epidemiological). The representative data series for the investigation were analyzed statistically and by applying the Pearson correlation test considering the coefficient of determination R for all pairs of data series. (3) Results: Salivary tests played animportant role in establishing control sessions, in carrying out prophylactic caries therapy, and establishing prognosis. The existence of a statistical associationwas confirmed between the prevalence of dental caries and the results of salivary tests for the study group. (4) Conclusions: The results of the saliva tests can be used in oral health promotion.

scholarly journals Malondialdehyde levels can be measured in serum and saliva by using a fast HPLC method with visible detection / Determinarea printr-o metodă HPLC-VIS rapidă a concentraţiilor serice şi salivare ale malondialdehidei

2016 ◽  
Vol 24 (3) ◽  
pp. 319-326 ◽  
Author(s):  
Erzsébet Fogarasi ◽  
Mircea Dumitru Croitoru ◽  
Ibolya Fülöp ◽  
Enikő Nemes-Nagy ◽  
Robert Gabriel Tripon ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Lipid Peroxidation ◽  
Free Radicals ◽  
Unsaturated Fatty Acids ◽  
Pearson Correlation ◽  
Living Organism ◽  
Hplc Method ◽  
Limit Of Quantification ◽  
Pearson Correlation Test ◽  
Repeated Sample

Abstract Oxidative stress appears when the amount of free radicals that are formed in a living organism exceed its spin-trapping ability. One of the most dangerous free radicals that are formed in the human body is the hydroxyl radical. It can alter several biomolecules, including the unsaturated fatty acids; this process is known as lipid peroxidation and can lead to cell necrosis and generation of several harmful byproducts including malondialdehyde, which serves also as a biomarker of oxidative stress. A new HPLC method with visible detection was developed for the detection of malondialdehyde in human serum and saliva samples. The method was verified in terms of specificity, linearity, limits of detection (0.35 ng/ml), limit of quantification (1.19 ng/ml), recovery (90.13±10.25 – 107.29±14.33) and precision (3.84±1.49% – 6.66±1.76%). An analysis time of only 1 minute was obtained and no interferences from the matrices were observed. Statistical analysis (Pearson correlation test) showed a moderate correlation (R = 0.5061, p = 0.0099) between serum and saliva concentrations (N = 25). The possibility of measuring salivary concentrations of malondialdehyde extents the applications of oxidative stress/lipid peroxidation estimations to categories of population unreachable before (pregnant women, small children, etc); repeated sample studies are also easier to make.

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