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Normal stress pattern of the pubic symphysis
1Department of Anatomy, Faculty of Medicine, Dokuz Eylul University, Izmir, Turkey.
Anatomy & Cell Biology
|April 3, 2014
Summary
The pelvic ring experiences stress from body weight and muscle forces. This study reveals the symphysis pubis is stressed by bending in the horizontal plane during one-leg standing and by tensile forces when standing on both legs.
Area of Science:
- Biomechanics
- Anatomy
- Orthopedics
Background:
- Existing literature primarily describes symphysis pubis stress in the frontal plane.
- Understanding stress in the horizontal plane is crucial due to the symphysis's complex movements and potential for rupture.
- Pelvic ring stability relies on body weight, ligament tension, and stabilizing muscles.
Purpose of the Study:
- To investigate the morphological and experimental stresses on the symphysis ossis pubis in the horizontal plane.
- To delineate how the symphysis pubis is stressed during different standing postures.
Main Methods:
- Morphological analysis of 20 pubic bones (12 male, 8 female) using horizontal and frontal slices.
- Radiographic and densitometric analysis of symphyseal cartilage width in 15 adult human specimens.
- Experimental stress testing on an embalmed pelvic ring, cutting the symphysis pubis midsagittally and applying force via the sacrum.
Main Results:
- The symphysis pubis is subjected to bending stresses in the horizontal plane during one-leg standing.
- Tensile forces act on the symphysis pubis when standing with both legs.
- Densitometric analysis and cartilage width measurements provide quantitative data on symphyseal structure.
Conclusions:
- The symphysis pubis experiences distinct stress patterns (bending and tensile) depending on the stance (one-leg vs. both-leg).
- These findings enhance understanding of pelvic ring biomechanics, particularly in the horizontal plane.
- This research contributes to a more comprehensive understanding of forces acting on the symphysis pubis.
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