Derivation of regression equation for estimation of stature by using measurement of femur

Background: Reconstruction of stature from broken fragments of bones is used as a part of the analysis in forensic anthropology for the purpose of identification of an individual. Long bones are traditionally used for estimation of stature. Long bones such as femur and tibia are the most important components of an individual’s stature. In the present study, regression equation was derived for estimation of maximum femoral length from measurements of the proximal end of femur. Aims and Objectives: To derive regression equations using femur length from measurements of neck-shaft angle and maximum vertical diameter of femur head. Materials and Methods: Two hundred unpaired femurs, devoid of gross pathology and irrespective of gender obtained from the Department of Anatomy of both VMKVMC &VMHMC were used for this study. The correlation coefficients of the neck-shaft angle and maximum diameter of head of femur to the maximum length of femur was calculated. These co-efficient were used for formulation of regression equation. Results: The present study was done to show that the maximum length of femur can be best calculated from the metric evaluation of vertical diameter of the head when the proximal fragments are available. The parameters in our study which includes maximum vertical diameter of the head showed positive correlation but the neck- shaft angle showed a low correlation and is not reliable to measure MFL from it. Conclusion: The present study concludes that the maximum length of femur can be best calculated from the metric evaluation of vertical diameter of the head when the proximal fragments are available.

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Estimative of Black Pepper leaf area with basis on the leaf blade linear dimension

Ciência Rural ◽

10.1590/s0103-84782007000500039 ◽

2007 ◽

Vol 37 (5) ◽

pp. 1458-1461 ◽

Cited By ~ 1

Author(s):

Fábio Luiz Partelli ◽

Henrique Duarte Vieira ◽

Alexandre Pio Viana

Keyword(s):

Leaf Area ◽

Leaf Blade ◽

Correlation Coefficients ◽

Black Pepper ◽

Regression Equation ◽

Piper Nigrum ◽

Regression Equations ◽

Linear Regression Equation ◽

Linear Leaf ◽

Predicted Values

This research was aimed at establishing regression equations to estimate black pepper (Piper nigrum) leaf area based on linear leaf measures. Different black pepper varieties where growth on the field, four different size leaves were collected per plant with a total of 52 leaves to establish the regression equation and 28 to validate the equation for each variety (Bragantina, Laçará, Guajarina e Cingapura). Leaf midrib length (LML), maximum leaf broad width (MLBW) and leaf area (LA) were measured. Pearson's linear correlation coefficients were determined between observed and predicted measures with the observed LA, besides estimating the linear regression equation for each variety. The equations best-fitted to estimate LA based on circumscript rectangle were: 1) LA = 2.2689 + 0.6900 x LML x MLBW; 2) LA = 1.6402 + 0.6816 x LML x MLBW; 3) LA = 1.4942 + 0.6215 x LML x MLBW and 4) LA = 0.7467 + 0.6735 x LML x MLBW, for Bragantina, Laçará, Guajarina and Cingapura varieties respectively. For all equations predicted values had high correlation coefficient with observed values thus showing that these equations must be variety specific and that they are appropriate for black pepper leaf area estimative.

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OSTEOMETRY OF FEMUR WITH ITS CLINICAL IMPLICATIONS

Journal of Anatomical Sciences - Volume 27(2), December 2019 ◽

10.46351/jas.v27i1pp05-09 ◽

2019 ◽

Vol 27 (1) ◽

Author(s):

S Jha ◽

R Chauhan

Keyword(s):

Indian Population ◽

Transverse Diameter ◽

Mean Values ◽

Factors Affecting ◽

Neck Shaft Angle ◽

Vertical Diameter ◽

Shaft Angle ◽

The Mean ◽

And Gender

Introduction: Femur osteometry is important for establishing individual identity, designing of prosthesis for hip replacement surgeries, nail application, and determination of age and sex. Review of previous study showed a lack of extensive database. This study was undertaken to build baseline data for femur osteometry in North Indian population. Material & Methods: One hundred and fifteen dry human femur of undetermined age and gender were collected for this study. Parameters namely length of femur, vertical diameter of head, transverse diameter of head, epicondylar breadth and neck shaft angle were measured using a vernier calliper. Data was analysed statistically using SPSS 19 software. Results: The mean values for length, vertical diameter head, transverse diameter head , epicondylar breadth and neck shaft angle were 418.16+27.34 mm, 38.43 ± 3.87mm, 35.41 ± 3.76mm, 72.06 ± 6.55mm and 121.5 º ± 6.14 respectively for the studied population. Conclusion: Study signifies the importance of collecting ostemetric data of femur for a specific population due to ethnic and environmental factors affecting it.

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Measurement of Neck-Shaft Angle Using CT Scout View in Healthy Jordanian Adults - A Reliability and Agreement Study

Journal of Advances in Medicine and Medical Research ◽

10.9734/jammr/2020/v32i1630624 ◽

2020 ◽

pp. 9-17

Author(s):

Ibrahim Altubasi ◽

Hayat Hamzeh ◽

Mohammad Madi

Keyword(s):

Correlation Coefficients ◽

New Method ◽

Rater Reliability ◽

Promising Alternative ◽

Intra Class Correlation ◽

Neck Shaft Angle ◽

Shaft Angle ◽

Scout View ◽

University Of Jordan ◽

Agreement Study

Aims: To report estimates of the reliability and agreement of a new method for measuring the femoral Neck-shaft angle in the Jordanian population. The neck-shaft angle is an important anatomical indicator in orthopedics of the hip. While there are different approaches to measuring the neck-shaft angle in the literature, there is no agreement on the best technique used for measurement. CT scout view was used in this study to provide a promising alternative. Study Design: Observational reliability and agreement study. Places and Duration of the Study: Department of physiotherapy, school of rehabilitation science, University of Jordan and University of Jordan Hospital between March 2014 and October 2015. Methodology: Two independent raters calculated the neck-shaft angle on each hip of 50 pelvic CT scout images of healthy adults to determine inter-rater reliability. One rater performed the measurement twice to determine the intra-rater reliability. Intra-class correlation coefficients were used to examine relative reliability. The standard error of measurement (SEM) and 95% minimal detectable change (MDC) were calculated to examine absolute reliability. Results: The mean value of all angle measurements was 131.3. Intra-class correlation coefficients were 0.726 and 0.63 for inter and intra-rater measurements respectively. SEM and MDC for inter-rater measurements were 2.69 and 7.46 respectively. For intra-rater measurements, they were 2.84 and 7.86 respectively. Conclusion: The new method proposed in this study for measuring the neck-shaft angle showed good reliability and small measurement error.

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THE MODEL FOR MANAGING INVESTMENTS IN THE MOSCOW ENVIRONMENT BASED ON A POWER REGRESSION EQUATION

EKONOMIKA I UPRAVLENIE: PROBLEMY, RESHENIYA ◽

10.36871/ek.up.p.r.2020.07.02.012 ◽

2020 ◽

Vol 2 (7) ◽

pp. 91-99

Author(s):

E. V. KOSTYRIN ◽

◽

M. S. SINODSKAYA ◽

Keyword(s):

Solid Waste ◽

Influencing Factors ◽

Pair Correlation ◽

Approximation Error ◽

Regression Equation ◽

Regression Equations ◽

The Impact ◽

The Relationship ◽

Average Approximation ◽

Average Approximation Error

The article analyzes the impact of certain factors on the volume of investments in the environment. Regression equations describing the relationship between the volume of investment in the environment and each of the influencing factors are constructed, the coefficients of the Pearson pair correlation between the dependent variable and the influencing factors, as well as pairwise between the influencing factors, are calculated. The average approximation error for each regression equation is determined. A correlation matrix is constructed and a conclusion is made. The developed econometric model is implemented in the program of separate collection of municipal solid waste (MSW) in Moscow. The efficiency of the model of investment management in the environment is evaluated on the example of the growth of planned investments in the activities of companies specializing in the export and processing of solid waste.

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Anthropometric Survey of US Army Personnel (1988): Correlation Coefficients and Regression Equations. Part 2. Simple and Partial Correlation Tables--Male

10.21236/ada224987 ◽

1990 ◽

Cited By ~ 1

Author(s):

James Cheverud ◽

Claire C. Gordon ◽

Robert A. Walker ◽

Cashell Jacquish ◽

Luci Kohn

Keyword(s):

Partial Correlation ◽

Correlation Coefficients ◽

Regression Equations ◽

Us Army ◽

Army Personnel ◽

Correlation Tables

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Heat Power Determination of Dv-290 Refrigerator’s Evaporator on the Basis of Thermodynamic Parameters of Inlet Air / Określenie Mocy Cieplnej Parownika Chłodziarki Dv-290 Na Podstawie Parametrów Termodynamicznych Powietrza Wlotowego

Archives of Mining Sciences ◽

10.2478/v10267-012-0060-z ◽

2012 ◽

Vol 57 (4) ◽

pp. 911-920

Author(s):

Bernard Nowak ◽

Zbigniew Kuczera

Keyword(s):

Thermodynamic Parameters ◽

Thermal Power ◽

Correlation Coefficients ◽

Specific Humidity ◽

Physical Parameters ◽

Air Cooling ◽

Regression Equations ◽

Evaporation And Condensation ◽

Before And After ◽

The Given

Abstract The present paper introduces a method for calculating the thermal power of DV-290 mining air cooler’s evaporator. The power usually differs from the nominal power given by the manufacturer. The thermodynamic parameters of cooled air are not obtained as a result of in situ measurements, but in indirect manner that is by determining the evaporation and condensation’s pressure values of R407C refrigerant. The pressure dependencies formulated as a function of air enthalpy at the evaporator’s inlet were obtained using calculations of a computer program which solves the system of equations describing heat and mass transfer in the refrigerator’s compressor on the basis of previous measurements of air performed before and after its cooling. The obtained dependencies are demonstrated in a graphical (fig. 2 and fig. 3) and analytical (the regression equations (19) and (20)) manner, the values of correlation coefficients are also presented. For the known evaporation and condensation pressure values of the refrigerant, and thus for its basic physical parameters the complete thermal power of the evaporator was determined, that is its: air cooling overt power, dehumidification occult power, temperature, relative humidity and specific humidity of air after its cooling. In addition, using the mentioned method, the capacity of DV-290 refrigerator’s evaporator is provided for the given thermodynamic parameters of air before cooling, along with air thermodynamic parameters after cooling.

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Reconstruction of the Hip in Multiple Hereditary Exostoses

Children ◽

10.3390/children8060490 ◽

2021 ◽

Vol 8 (6) ◽

pp. 490

Author(s):

Dong Hoon Lee ◽

Dror Paley

Keyword(s):

Hip Joint ◽

Joint Involvement ◽

Neck Shaft Angle ◽

Multiple Hereditary Exostoses ◽

Femur Neck ◽

Radiographic Outcomes ◽

Surgical Dislocation ◽

Center Edge ◽

Shaft Angle ◽

Coxa Valga

The hip joint involvement in multiple hereditary exostoses (MHE) occurs in 30–90%, causing pain and limitation of motion by femoroacetabular impingement, coxa valga, acetabular dysplasia, hip joint subluxation, and osteoarthritis. The purpose of this study was to investigate the clinical and radiographic outcomes of ten hips in seven patients treated by surgical dislocation and corrective osteotomies between 2004 and 2009. Surgical dislocation and excision of the osteochondromas and varus intertrochanteric osteotomies were performed in all cases when the neck–shaft angle was > 150°. Common sites of osteochondromas were medial, posterior, and anterior neck of the femur. Neck–shaft angle of the femur was improved from a mean of 157° to 139°, postoperatively. On an average, the center-edge angle improved from 20° to 30° postoperatively. We believe that Ganz’s safe surgical dislocation technique is the preferred treatment of MHE. This safeguards the circulation of the femoral head and the osteochondromas can be resected under direct vision. It can be combined with additional corrective osteotomies because the hip affected by MHE is frequently associated with dysplastic changes which can result in premature osteoarthritis.

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The association between femoral neck shaft angle and degenerative disease of the hip in a cadaveric model

Hip International ◽

10.1177/11207000211013029 ◽

2021 ◽

pp. 112070002110130

Author(s):

Leigh-Anne Tu ◽

Douglas S Weinberg ◽

Raymond W Liu

Keyword(s):

Femoral Head ◽

Femoral Neck ◽

Hip Osteoarthritis ◽

Volume Ratio ◽

Femoral Head Coverage ◽

Neck Shaft Angle ◽

Hip Arthritis ◽

Femoral Version ◽

Shaft Angle ◽

The Impact

Background: While the influences of acetabular dysplasia and overcoverage on hip arthritis have been studied, the impact of femoral neck-shaft angle on hip arthritis is much more poorly understood. The purpose of this study is to determine if a relationship exists between neck shaft angle and the development of osteoarthritis, a better understanding of which would be useful to surgeons planning osteotomies about the hip. Methods: 533 cadaveric femora and acetabulae (1066 total) from the Hamann-Todd Osteological Collection (Cleveland, OH) were acquired. We measured true neck shaft angle using an AP photograph with the femoral neck parallel to the table. Femoral head volume to acetabular volume ratio, representing femoral head coverage, as well as femoral version were utilised. Correlation between neck shaft angle, femoral version, femoral head coverage and osteoarthritis were evaluated with multiple regression analysis. Results: The mean age and standard deviation was 56 ± 10 years. There were 64 females (12%) and 469 males. There were 380 Caucasians (71%) and 153 African-Americans. Mean femoral version was 11° ± 12° and mean true neck shaft angle was 127.7° ± 5.9° There was a strong correlation between age and arthritis (standardised beta 0.488, p < 0.001). There was a significant correlation between increasing true neck shaft angle and decreasing hip arthritis (standardised beta -0.024, p = 0.038). In the femoral head overcoverage subset, increasing true neck shaft angle was still significantly associated with decreasing hip arthritis (standardised beta −0.088, p = 0.018), although this relationship was not significant with femoral head undercoverage subset. Conclusions: With sufficient acetabular coverage, a relative increase in femoral neck shaft angle within the physiologic range is associated with decreased hip osteoarthritis. Clinical relevance: An understanding of the relationship between femoral neck shaft angle and hip osteoarthritis could be useful for surgeons planning pelvic or proximal femur osteotomies in children.

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