Event-related difference in cross-sectional area of the gluteus maximus muscle in high-school athletes

SummaryDuring a triple pelvic osteotomy, rotation of the free acetabular segment causes the pubic remnant on the acetabulum to rotate into the pelvic canal. The resulting narrowing may cause complications by impingement on the organs within the pelvic canal. Triple pelvic osteotomies were performed on ten cadaver pelves with pubic remnants equal to 0, 25, and 50% of the hemi-pubic length and angles of acetabular rotation of 20, 30, and 40 degrees. All combinations of pubic remnant lengths and angles of acetabular rotation caused a significant reduction in pelvic canal-width and cross-sectional area, when compared to the inact pelvis. Zero, 25, and 50% pubic remnants result in 15, 35, and 50% reductions in pelvic canal width respectively. Overrotation of the acetabulum should be avoided and the pubic remnant on the acetabular segment should be minimized to reduce postoperative complications due to pelvic canal narrowing.When performing triple pelvic osteotomies, the length of the pubic remnant on the acetabular segment and the angle of acetabular rotation both significantly narrow the pelvic canal. To reduce post-operative complications, due to narrowing of the pelvic canal, overrotation of the acetabulum should be avoided and the length of the pubic remnant should be minimized.

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Jump performance and thigh muscle cross-sectional area in young female rhythmic gymnasts

Gazzetta Medica Italiana Archivio per le Scienze Mediche ◽

10.23736/s0393-3660.18.03698-7 ◽

2019 ◽

Vol 178 (3) ◽

Author(s):

Antonio Cicchella ◽

Monica Mannai ◽

Jaan Ereline ◽

Mati Paasuke ◽

Helena Gapeyeva

Keyword(s):

Young Female ◽

Cross Sectional Area ◽

Thigh Muscle ◽

Sectional Area ◽

Cross Sectional ◽

Jump Performance ◽

Muscle Cross Sectional Area ◽

Rhythmic Gymnasts

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DETERMINATION OF THE FUNCTION OF THE ROD’S CROSS-SECTIONAL AREA USING VIBRATION EIGENFREQUENCIES

Izvestia Ufimskogo Nauchnogo Tsentra RAN ◽

10.31040/2222-8349-2020-0-4-19-24 ◽

2020 ◽

Vol 0 (4) ◽

pp. 19-24

Author(s):

I.M. UTYASHEV ◽

◽

A.A. AITBAEVA ◽

A.A. YULMUKHAMETOV ◽

◽

...

Keyword(s):

Cross Sectional Area ◽

Variable Cross ◽

Sectional Area ◽

Longitudinal Vibrations ◽

Cross Sectional ◽

Method Error ◽

Various Boundary Conditions ◽

Elastic Fixation ◽

Crosssectional Area

The paper presents solutions to the direct and inverse problems on longitudinal vibrations of a rod with a variable cross-sectional area. The law of variation of the cross-sectional area is modeled as an exponential function of a polynomial of degree n . The method for reconstructing this function is based on representing the fundamental system of solutions of the direct problem in the form of a Maclaurin series in the variables x and λ. Examples of solutions for various section functions and various boundary conditions are given. It is shown that to recover n unknown coefficients of a polynomial, n eigenvalues are required, and the solution is dual. An unambiguous solution was obtained only for the case of elastic fixation at one of the rod’s ends. The numerical estimation of the method error was made using input data noise. It is shown that the error in finding the variable crosssectional area is less than 1% with the error in the eigenvalues of longitudinal vibrations not exceeding 0.0001.

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