Pubovisceralis Muscle Fiber Architecture Determination: Comparison Between Biomechanical Modeling and Diffusion Tensor Imaging

Brandão, Sofia; Parente, Marco; Silva, Elisabete; Roza, Thuane Da; Mascarenhas, Teresa; Leitão, João; Cunha, João Teles e; Jorge, R.M. Natal; Nunes, Rita G.

doi:10.1007/s10439-016-1788-y

Cited by 12 publications

(5 citation statements)

References 42 publications

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“…On the whole muscle level, DTI has been used in combination with tractography algorithms to measure changes in muscle architecture with passive length changes (9,10,62,83). DTI has also proven useful in biomechanical modeling studies, where information about fiber orientation is essential to accurately simulate the anisotropic behavior of muscle tissue (1,12,86). DTI has also been used to study changes in muscle fiber structure (DTI indexes) and (64); B], using information from anatomical scans and diffusion tensor imaging (DTI) tractography.…”

Section: Diffusion Imagingmentioning

confidence: 99%

Contemporary image-based methods for measuring passive mechanical properties of skeletal muscles in vivo

Bilston

Bolsterlee

Nordez

et al. 2019

Journal of Applied Physiology

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Skeletal muscles’ primary function in the body is mechanical: to move and stabilize the skeleton. As such, their mechanical behavior is a key aspect of their physiology. Recent developments in medical imaging technology have enabled quantitative studies of passive muscle mechanics, ranging from measurements of intrinsic muscle mechanical properties, such as elasticity and viscosity, to three-dimensional muscle architecture and dynamic muscle deformation and kinematics. In this review we summarize the principles and applications of contemporary imaging methods that have been used to study the passive mechanical behavior of skeletal muscles. Elastography measurements can provide in vivo maps of passive muscle mechanical parameters, and both MRI and ultrasound methods are available (magnetic resonance elastography and ultrasound shear wave elastography, respectively). Both have been shown to differentiate between healthy muscle and muscles affected by a broad range of clinical conditions. Detailed muscle architecture can now be depicted using diffusion tensor imaging, which not only is particularly useful for computational modeling of muscle but also has potential in assessing architectural changes in muscle disorders. More dynamic information about muscle mechanics can be obtained using a range of dynamic MRI methods, which characterize the detailed internal muscle deformations during motion. There are several MRI techniques available (e.g., phase-contrast MRI, displacement-encoded MRI, and “tagged” MRI), each of which can be collected in synchrony with muscle motion and postprocessed to quantify muscle deformation. Together, these modern imaging techniques can characterize muscle motion, deformation, mechanical properties, and architecture, providing complementary insights into skeletal muscle function.

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Section: Diffusion Imagingmentioning

confidence: 99%

Contemporary image-based methods for measuring passive mechanical properties of skeletal muscles in vivo

Bilston

Bolsterlee

Nordez

et al. 2019

Journal of Applied Physiology

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“…The levator ani muscle bore high Y–Z shear stress to prevent the pelvic viscera from excessive downward movement. According to previous studies, the levator ani muscle has fiber orientation ( 18 ). It holds a strong load-bearing capacity along the horizontal fiber direction, while its vertical fiber direction cannot bear excessive load.…”

Section: Discussionmentioning

confidence: 99%

Relationship between high intra-abdominal pressure and compliance of the pelvic floor support system in women without pelvic organ prolapse: A finite element analysis

Liu¹,

Rong²,

Liu³

et al. 2022

Front. Med.

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Previous studies mainly focused on the relationship between the size of the prolapse and injury to the supporting tissues, but the strain and stress distributions of the supporting tissues as well as high-risk areas of injury are still unknown. To further investigate the effect of supporting tissues on organs and the interactions between organs, this study focused on the relationship between high intra-abdominal pressure and the compliance of the pelvic floor support system in a normal woman without pelvic organ prolapse (POP), using a finite element model of the whole pelvic support system. A healthy female volunteer (55 years old) was scanned using magnetic resonance imaging (MRI) during rest and Valsalva maneuver. According to the pelvic structure contours traced by a gynecologist and anatomic details measured from dynamic MRI, a finite element model of the whole pelvic support system was established, including the uterus, vagina with cavity, cardinal and uterosacral ligaments, levator ani muscle, rectum, bladder, perineal body, pelvis, and obturator internus and coccygeal muscles. This model was imported into ANSYS software, and an implicit iterative method was employed to simulate the biomechanical response with increasing intra-abdominal pressure. Stress and strain distributions of the vaginal wall showed that the posterior wall was more stable than the anterior wall under high intra-abdominal pressure. Displacement at the top of the vagina was larger than that at the bottom, especially in the anterior–posterior direction. These results imply potential injury areas with high intra-abdominal pressure in non-prolapsed women, and provide insight into clinical managements for the prevention and surgical repair plans of POP.

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“…The puborectalis muscle is more important than the pubococcygeus muscle and the iliococcygeal muscle. Previously, the anorectal angle and levator plate were considered to be good parameters to evaluate the pelvic oor structure [18] ,which plays an important role in defecation. However, this study suggested that the puborectalis muscle plays a decisive role in the evaluation of the pelvic oor structure.…”

Section: Discussionmentioning

confidence: 99%

Three-dimensional ultrasonography study of female defecation disorder caused by changes of the puborectalis muscle

Zhang

Liu

Wang³

et al. 2019

Preprint

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Objective To investigate the correlation between pelvic floor dyssynergia-type constipation and the puborectalis muscle using three-dimensional ultrasonography. Methods Eighty-seven patients with pelvic floor dyssynergia-type constipation (observation group) and 87 healthy volunteers (control group) were enrolled in this study. Three-dimensional ultrasonography of the pelvic floor was performed on patients and healthy volunteers in a lithotomy position at rest and during straining and squeezing. The three-dimensional reconstructed sonogram was analysed to determine the puborectalis angle and puborectalis thickness at the 6 o’clock position (patients in a lithotomy position). Results (1) The puborectalis angles of the observation and control groups were not significantly different at rest [(85.664 ± 1.926)°, (85.813 ± 1.500)°] and during squeezing [(87.478 ± 2.125)°, (86.960 ± 1.751)°] (P > 0.05) but were significantly different when straining [(80.389 ± 2.268)°, (94.382 ± 1.540)°] (P < 0.05). The difference in the puborectalis angles of the two groups between rest and straining [(5.275 ± 1.236)°, (-8.569 ± 1.209)°] was statistically significant (P < 0.05). (2) The puborectalis thickness of the observation and control groups was not significantly different at rest ([3.994 ± 0.128) mm, (3.983 ± 0.091) mm] and during anal squeezing [(4.082 ± 0.154) mm, (4.126 ± 0.113) mm] (P > 0.05) but was significantly different when straining [(4.630 ± 0.199) mm, (4.296 ± 0.121) mm] (P < 0.05). The differences in the puborectalis thickness at rest and during straining in the observation and control groups were (-0.636 ± 0.217) mm and (-0.316 ± 0.089) mm, respectively, resulting in a statistically significant difference between the two groups (P < 0.05). Conclusion The puborectalis angle in patients with pelvic floor dyssynergia-type constipation was smaller than that in healthy volunteers during straining. The puborectalis thickness at the 6 o’clock position with the patient in a lithotomy position in patients with pelvic floor dyssynergia-type constipation was larger than that in healthy volunteers. Moreover, larger differences between rest and straining are associated with a more severe degree of constipation. Project funding Natural Science Foundation of Shandong (ZR2012HM086)

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Pubovisceralis Muscle Fiber Architecture Determination: Comparison Between Biomechanical Modeling and Diffusion Tensor Imaging

Cited by 12 publications

References 42 publications

Contemporary image-based methods for measuring passive mechanical properties of skeletal muscles in vivo

Contemporary image-based methods for measuring passive mechanical properties of skeletal muscles in vivo

Relationship between high intra-abdominal pressure and compliance of the pelvic floor support system in women without pelvic organ prolapse: A finite element analysis

Three-dimensional ultrasonography study of female defecation disorder caused by changes of the puborectalis muscle

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