A mechanistic approach for the calculation of intervertebral mobility in mammals based on vertebrae osteometry

Belyaev, Ruslan I.; Kuznetsov, Alexander N.; Prilepskaya, Natalya E.

doi:10.1111/joa.13300

Cited by 13 publications

(48 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To calculate intervertebral mobility, we used a recently developed and validated osteometry‐based method (Belyaev et al, 2021). It is based on the assumption of the functional interrelation between aROM and the geometry of vertebrae and, in particular, of zygapophyseal articular facets (Kuznetsov & Tereschenko, 2010).…”

Section: Methodsmentioning

confidence: 99%

“…In the course of evaluation of the optimal formulae for calculating aROM values, it was found that separate formulae for different zygapophyseal facet types (radial [Rf], tangential [Tf], radial with a lock [RfL]) give significantly greater accuracy in aROM calculation than the formulae for the presacral vertebral column as a whole, and greater accuracy than the separate formulae for different vertebral column regions (cervical, thoracic, and lumbar) (Belyaev et al, 2021). In artiodactyls, the Rf type (left and right facets together form a V‐like pattern in the transverse plane) is present in the cervical region and the neck–thorax transition (joints C2–T1), plus the T1–T2 joint in Tayassu , Pecari , Giraffa , and, as individual variation, in Choeropsis .…”

Section: Methodsmentioning

confidence: 99%

“…Reliable in vitro aROM data are available for pigs, sheep, and cows (Wilke et al, 1997a, 1997b, 2011). These data were used for optimization of the values of numeric coefficients K R and K S in the formulae (see the procedure details in Belyaev et al, 2021). The pig‐specific, sheep‐specific, and cow‐specific coefficient values were obtained, as well as the general (pig+sheep+cow) coefficients.…”

Section: Methodsmentioning

confidence: 99%

“…This gives us the right to hope that in vitro studies for the thoracic region do not overestimate the aROM in comparison with the lifetime values inherent in the integral thorax. In more detail, the effect of ribs and sternum removal on the results of in vitro measurements was referred to in methodological study (Belyaev et al, 2021).…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

How the even‐toed ungulate vertebral column works: Comparison of intervertebral mobility in 33 genera

2021

Self Cite

View full text Add to dashboard Cite

In this study, we used a previously developed osteometry‐based method to calculate available range of motion in presacral intervertebral joints in artiodactyls. We have quantified all three directions of intervertebral mobility: sagittal bending (SB), lateral bending (LB), and axial rotation (AR). This research covers 10 extant families of artiodactyls from 33 genera and 39 species. The cervical region in artiodactyls is the most mobile region of the presacral vertebral column in SB and LB. Mobility is unevenly distributed throughout the joints of the neck. The posterior neck joints (C4–C7) are significantly more mobile (on average by 2.5–3.5°) to anterior joints (C2–C4) and to the neck–thorax joint (C7–T1) in SB and LB. An increase in the relative length of the cervical region in artiodactyls is accompanied by an increase in the bending amplitudes (SB: Pearson r = 0.781; LB: r = 0.884). Animals with the most mobile necks (representative of Giraffidae and Camelidae) are 2–3 times more mobile in SB and LB compared to species with the least mobile necks. The thoracic region in artiodactyls, as in other mammals, is characterized by the greatest amplitudes of AR due to the tangential orientation of the zygapophyseal articular facets. The lowest AR values in the thoracic region are typical for the heaviest artiodactyls—Hippopotamidae. The highest AR values are typical for such agile runners as cervids, musk deer, pronghorn, as well as large and small antelopes. SB mobility in the posterior part of the thoracic region can be used by artiodactyls during galloping. The highest values of SB aROM in the posterior part of the thoracic region are typical for small animals with high SB mobility in the lumbar region. The lumbar region in mammals is adapted for efficient SB. Both the cumulative and average SB values in the lumbar region showed correspondence to the running type employed by an artiodactyl. The greatest SB amplitudes in the lumbar region are typical for small animals, which use saltatorial and saltatorial–cursorial running. An increase in body size also corresponds to a decrease in lumbar SB amplitudes. The lowest SB amplitudes are typical for species using the so‐called mediportal running. Adaptation to endurance galloping in open landscapes is accompanied by a decrease in lumbar SB amplitudes in artiodactyls. The consistency of the approach used and the wide coverage of the studied species make it possible to significantly expand and generalize the knowledge of the biomechanics of the vertebral column in artiodactyls.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

How the even‐toed ungulate vertebral column works: Comparison of intervertebral mobility in 33 genera

2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…A center of rotation was found by fitting (i.e., manually adjusting size and position) a semitransparent sphere matching the curvature of the zygapophyseal facets of C7 with the sphere's surface from the lateral and dorsal perspectives (see Kuznetsov and Tereschenko, 2010; Belayaev et al. 2020 for a similar approach of using zygapophyseal curvature; SI 8). Next, a Maya “joint” is placed into the center of the fitted sphere (cf.…”

Section: Methodsmentioning

confidence: 99%

Pushing the boundary? Testing the “functional elongation hypothesis” of the giraffe's neck

2021

View full text Add to dashboard Cite

Although giraffes maintain the usual mammalian cervical number of seven vertebrae, their first thoracic vertebra (T1) exhibits aberrant anatomy and has been hypothesized to functionally elongate the neck. We test this "functional elongation hypothesis" by combining phylogenetically informed analyses of neck length, three-dimensional (3D) vertebral shape, and of the functional significance of shape differences across a broad sample of ruminants and camelids. Digital bone models of the cervicothoracic transition were subjected to 3D geometric morphometric analysis revealing how the shape of the seventh cervical (C7) has converged in several long-necked species. However, we find a unique "cervicalization" of the giraffe's T1. In contrast, we demonstrate a "thoracalization" of C7 for the European bison. Other giraffids (okapi and extinct Sivatherium) did not exhibit "cervicalized" T1 morphology. Quantitative range of motion (ROM) analysis at the cervicothoracic transition in ruminants and camelids confirms the "functional elongation hypothesis" for the giraffe in terms of increased mobility, especially with regard to dorsoventral flexion/extension. Additionally, other factors related to the unique morphology of the giraffe's cervicothoracic transition such as neck posture and intervertebral stability are discussed and should be considered in future studies of giraffe neck evolution.

show abstract

Are owls technically capable of making a full head turn?

Panyutina,

Kuznetsov

2023

Journal of Morphology

Self Cite

View full text Add to dashboard Cite

The three‐dimensional configuration of the neck that produces extreme head turn in owls was studied using the Joint Coordinate System. The limits of planar axial rotation (AR), lateral, and sagittal bending in each vertebral joint were measured. They are not extraordinary among birds, except probably for the extended ability for AR. The vertebral joint angles involved in the 360° head turn do not generally exceed the limits of planar mobility. Rotation in one plane does not expand the range of motion in the other, with one probable exception being extended dorsal bending in the middle of the neck. Therefore, the extreme 360° head turn can be presented as a simple combination of the three planar motions in the neck joints. Surprisingly, certain joints are always laterally bent or axially rotated to the opposite side than the head was turned. This allows keeping the anterior part of the neck parallel to the thoracic spine, which probably helps preserve the ability for peering head motions throughout the full head turn. The potential ability of one‐joint muscles of the owl neck, the mm. intertransversarii, to ensure the 360° head turn was addressed. It was shown that the 360° head turn does not require these muscles to shorten beyond the known contraction limit of striated vertebrate muscles. Shortening by 50% or less is enough for the mm. intertransversarii in the middle neck region for the 360° head turn. This study has broad implications for further research on vertebral mobility and function in a variety of tetrapods, providing a new method for CT scan‐based measurement of intervertebral angles.

show abstract

A mechanistic approach for the calculation of intervertebral mobility in mammals based on vertebrae osteometry

Cited by 13 publications

References 46 publications

How the even‐toed ungulate vertebral column works: Comparison of intervertebral mobility in 33 genera

How the even‐toed ungulate vertebral column works: Comparison of intervertebral mobility in 33 genera

Pushing the boundary? Testing the “functional elongation hypothesis” of the giraffe's neck

Are owls technically capable of making a full head turn?

Contact Info

Product

Resources

About