Morphometric geometric differences between right and left human tali: A cadaveric study of fluctuating asymmetry via systematic measurement and three-dimensional scanning

Fluctuating asymmetry in plant leaves is a widely used measure in geometric morphometrics for assessing random deviations from perfect symmetry. In this study, we considered the concept of fluctuating asymmetry to improve the prototype leaf shape of the functional-structural plant model L-Cucumber. The overall objective was to provide a realistic geometric representation of the leaves for the light sensitive plant reactions in the virtual plant model. Based on three-dimensional data from several hundred in situ digitized cucumber leaves comparisons of model leaves and measurements were conducted. Robust Bayesian comparison of groups was used to assess statistical differences between leaf halves while respecting fluctuating asymmetries. Results indicated almost no directional asymmetry in leaves comparing different distances from the prototype while detecting systematic deviations shared by both halves. This information was successfully included in an improved leaf prototype and implemented in the virtual plant model L-Cucumber. Comparative virtual plant simulations revealed a slight improvement in plant internode development against experimental data using the novel leaf shape. Further studies can now focus on analyses of stress on the 3D-deformation of the leaf and the development of a dynamic leaf shape model.

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Robotic Surgical Approach to the Mesial Temporal Region: A Preliminary Three-Dimensional Cadaveric Study of Technical Feasibility

World Neurosurgery ◽

10.1016/j.wneu.2020.07.153 ◽

2020 ◽

Vol 144 ◽

pp. e40-e52

Author(s):

Ahmet Akbaş ◽

Bekir Tuğcu ◽

M. Şakir Ekşi ◽

Buruç Erkan ◽

Çağrı Canbolat ◽

...

Keyword(s):

Surgical Approach ◽

Three Dimensional ◽

Cadaveric Study ◽

Temporal Region ◽

Technical Feasibility

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Three-dimensional-printed patient-specific Kirschner-wire guide for percutaneous fixation of undisplaced scaphoid fractures: a cadaveric study

Journal of Hand Surgery (European Volume) ◽

10.1177/1753193419851525 ◽

2019 ◽

Vol 44 (7) ◽

pp. 692-696 ◽

Cited By ~ 2

Author(s):

Vincent Salabi ◽

Guillaume Rigoulot ◽

Alain Sautet ◽

Adeline Cambon-Binder

Keyword(s):

Kirschner Wire ◽

Three Dimensional ◽

Cadaveric Study ◽

Ct Scans ◽

Patient Specific ◽

Angular Deviation ◽

Percutaneous Fixation ◽

Scaphoid Fractures ◽

Cadaveric Model ◽

The Ideal

Undisplaced scaphoid waist fractures can be managed by percutaneous fixation. The purpose of this study is to compare percutaneous fixation using a three-dimensional (3-D)-printed guide with the conventional method in a cadaveric study. Twelve wrists were divided into two groups: standard fluroscopic technique group, and a patient-specific 3-D-printed guide group. In the patient-specific group, using high resolution CT scans, we manufactured a mould-guide including a wire guide sleeve aligned with the planned ideal path, and 3-D printed it. On postoperative CT scans we measured the angular deviation of the screw axis from the ideal axis, and compared the two groups. The angular deviation was significantly lower in the patient-specific guide group. We concluded that a 3-D-printed guide for scaphoid percutaneous fixation allows a more accurate placement of the screw than a fluoroscopy guide in our cadaveric model.

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Accuracy of Computer-Assisted Template-Guided Autotransplantation of Teeth With Custom Three-Dimensional Designed/Printed Surgical Tooling: A Cadaveric Study

Journal of Oral and Maxillofacial Surgery ◽

10.1016/j.joms.2016.12.049 ◽

2017 ◽

Vol 75 (5) ◽

pp. 925.e1-925.e7 ◽

Cited By ~ 10

Author(s):

David Anssari Moin ◽

Jop Pieter Verweij ◽

Hugo Waars ◽

Richard van Merkesteyn ◽

Daniel Wismeijer

Keyword(s):

Three Dimensional ◽

Cadaveric Study ◽

Computer Assisted

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A three-dimensional printed patient-specific scaphoid replacement: a cadaveric study

Journal of Hand Surgery (European Volume) ◽

10.1177/1753193418757634 ◽

2018 ◽

Vol 43 (4) ◽

pp. 407-412 ◽

Cited By ~ 3

Author(s):

Philipp Honigmann ◽

Ralf Schumacher ◽

Romy Marek ◽

Franz Büttner ◽

Florian Thieringer ◽

...

Keyword(s):

Range Of Motion ◽

Three Dimensional ◽

Cadaveric Study ◽

Patient Specific ◽

Test Results ◽

Physiological Range

We present our first cadaveric test results of a three-dimensional printed patient-specific scaphoid replacement with tendon suspension, which showed normal motion behaviour and preservation of a stable scapholunate interval during physiological range of motion.

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Facial fluctuating asymmetry is not associated with childhood ill-health in a large British cohort study

Proceedings of The Royal Society B Biological Sciences ◽

10.1098/rspb.2014.1639 ◽

2014 ◽

Vol 281 (1792) ◽

pp. 20141639 ◽

Cited By ~ 36

Author(s):

Nicholas Pound ◽

David W. Lawson ◽

Arshed M. Toma ◽

Stephen Richmond ◽

Alexei I. Zhurov ◽

...

Keyword(s):

Longitudinal Study ◽

Fluctuating Asymmetry ◽

Large Scale ◽

Three Dimensional ◽

Extensive Literature ◽

Geometric Morphometric ◽

Facial Symmetry ◽

Parents And Children ◽

Developmental Disturbance ◽

British Cohort Study

The idea that symmetry in facial traits is associated with attractiveness because it reliably indicates good physiological health, particularly to potential sexual partners, has generated an extensive literature on the evolution of human mate choice. However, large-scale tests of this hypothesis using direct or longitudinal assessments of physiological health are lacking. Here, we investigate relationships between facial fluctuating asymmetry (FA) and detailed individual health histories in a sample ( n = 4732) derived from a large longitudinal study (Avon Longitudinal Study of Parents and Children) in South West England. Facial FA was assessed using geometric morphometric analysis of facial landmark configurations derived from three-dimensional facial scans taken at 15 years of age. Facial FA was not associated with longitudinal measures of childhood health. However, there was a very small negative association between facial FA and IQ that remained significant after correcting for a positive allometric relationship between FA and face size. Overall, this study does not support the idea that facial symmetry acts as a reliable cue to physiological health. Consequently, if preferences for facial symmetry do represent an evolved adaptation, then they probably function not to provide marginal fitness benefits by choosing between relatively healthy individuals on the basis of small differences in FA, but rather evolved to motivate avoidance of markers of substantial developmental disturbance and significant pathology.

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Fluctuating Asymmetry and Developmental Instability in Sagittal Craniosynostosis

The Cleft Palate-Craniofacial Journal ◽

10.1597/08-001.1 ◽

2009 ◽

Vol 46 (2) ◽

pp. 187-196 ◽

Cited By ~ 13

Author(s):

Valerie Burke DeLeon ◽

Joan T. Richtsmeier

Keyword(s):

Fluctuating Asymmetry ◽

Three Dimensional ◽

Distance Matrix ◽

Developmental Instability ◽

Matrix Analysis ◽

Control Group ◽

Euclidean Distance Matrix ◽

Sagittal Craniosynostosis ◽

Landmark Data ◽

Cranial Shape

Objective: To determine whether premature sagittal craniosynostosis is associated with developmental instability in the skull by analyzing fluctuating asymmetry in skull shape. Design: Cranial shape was quantified by collecting coordinate data from landmarks located on three-dimensional reconstructions of preoperative computed tomography (CT) images of 22 children with sagittal craniosynostosis and 22 age-matched controls. A fluctuating asymmetry application of Euclidean distance matrix analysis (EDMA) was used to quantify and compare asymmetry in cranial shape using these landmark data. Results: In contrast to expectations, the sagittal craniosynostosis group did not show a statistically significant increase in the overall level of fluctuating asymmetry relative to the control group. However, we discerned statistically significant localized increases in fluctuating asymmetry in the sagittal craniosynostosis group at pterion and the anterior clinoid processes (α = .05). We also determined a significant correlation of fluctuating asymmetry values between the two groups (r = .71). Conclusions: We conclude that there is no evidence of a role for system-wide developmental instability in the etiology of nonsyndromic sagittal craniosynostosis. However, the localized evidence of asymmetry at the anterior clinoid processes in the sagittal synostosis group suggests an association with the tracts of dura mater that attach there.

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Three Dimensional Anatomical Study of Carpal Tunnel (Cadaveric Study)

Basrah Journal of Surgery ◽

10.33762/bsurg.2002.55222 ◽

2002 ◽

Vol 8 (2) ◽

pp. 0-0

Author(s):

Thamir A. Hamdan ◽

Majeed Al-Hamdani ◽

Zuhair F. Fathallah

Keyword(s):

Carpal Tunnel ◽

Three Dimensional ◽

Anatomical Study ◽

Cadaveric Study

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Effects of humeral shortening on the three-dimensional configuration of the brachial plexus: a cadaveric study

Journal of Hand Surgery (European Volume) ◽

10.1177/1753193419837485 ◽

2019 ◽

Vol 44 (6) ◽

pp. 632-639

Author(s):

Jérôme Valcarenghi ◽

Fabian Moungondo ◽

Aurélie Andrzejewski ◽

Véronique Feipel ◽

Frédéric Schuind

Keyword(s):

Brachial Plexus ◽

Three Dimensional ◽

Cadaveric Study ◽

Humeral Shaft ◽

Nerve Grafts ◽

Three Dimensional Configuration ◽

Nerve Suturing ◽

Different Parts

This study reports the gains in length of nerves after three different humeral shortenings. Ten brachial plexuses were dissected. The lengths of the different parts of the brachial plexus were measured using a three-dimensional digitizing system after humeral shaft shortenings of 2, 4 and 6 cm and after a standardized force of 0.588 N was used to apply tension to the plexus. The feasibility of nerve suturing was studied. Humeral shortening allowed for significant gains in lengths of the musculocutaneous (42 mm), median (41 mm), ulnar (29 mm) and radial nerves (15 mm). A 2 cm humeral shortening allowed a 2 cm nerve gap to be directly sutured in 70% to 90% of cases. This study suggests that humeral shortening could allow direct suture of nerve defects, or shorten the length of nerve grafts required to bridge a gap.

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