Quantification of Contralateral Differences of the Scaphoid: A Comparison of Bone Geometry in Three Dimensions

Letta, Claudio; Schweizer, Andreas; Fürnstahl, Philipp

doi:10.1155/2014/904275

Cited by 16 publications

(10 citation statements)

References 35 publications

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“…Pointing out the importance of ulnar variance in the restoration of the normal anatomy, one can say that our SSM‐based approach performs comparably well with respect to the translation error, considering our findings about the maximal translation error along the longitudinal axis of 3.4 mm and 3.6 mm for the radius (

R_{d}

) and ulna (

U_{d}

), respectively. Bindra et al found a mean rotational difference around the pro‐/supination axis between paired side‐to‐side radius of 4.9°. Dumont et al have also emphasized the importance of the torsional component in radius and ulna malunions.…”

Section: Discussionmentioning

confidence: 99%

“…The leave‐one‐out tests were performed for each of the six configurations

R_{e}

R_{d}

R_{p}

U_{e}

U_{d}

, and

U_{p}

and for all of the 59 forearm bones, resulting in a total of 354 tests. For the quantification of the accuracy of the prediction, that is, the deviation between predicted and original shape, we used two different measurement techniques that have been used previously in studies investigating contralateral differences of bone anatomy based on 3D models . In the first technique, the model surfaces where discretized as dense point sets (sampled in 1 mm resolution), permitting to determine the distance for a given point on one model surface to the closest point on the other surface.…”

Section: Methodsmentioning

confidence: 99%

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Prediction of normal bone anatomy for the planning of corrective osteotomies of malunited forearm bones using a three‐dimensional statistical shape model

Mauler

Langguth

Schweizer

et al. 2017

Journal Orthopaedic Research

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Corrective osteotomies of the forearm based on 3D computer simulation using contralateral anatomy as a reconstruction template is an approved method. Limitations are existing considerable differences between left and right forearms, and that a healthy contralateral anatomy is required. We evaluated if a computer model, not relying on the contralateral anatomy, may replace the current method by predicting the pre-traumatic healthy shape. A statistical shape model (SSM) was generated from a set of 59 CT scans of healthy forearms, encoding the normal anatomical variations. Three different configurations were simulated to predict the pre-traumatic shape with the SSM (cross-validation). In the first two, only the distal or proximal 50% of the radius were considered as pathological. In a third configuration, the entire radius was assumed to be pathological, only the ulna being intact. Corresponding experiments were performed with the ulna. Accuracy of the prediction was assessed by comparing the predicted bone with the healthy model. For the radius, mean rotation accuracy of the prediction between 2.9 ± 2.2° and 4.0 ± 3.1° in pronation/supination, 0.4 ± 0.3° and 0.6 ± 0.5° in flexion/extension, between 0.5 ± 0.3° and 0.5 ± 0.4° in radial-/ulnarduction. Mean translation accuracy along the same axes between 0.8 ± 0.7 and 1.0 ± 0.8 mm, 0.5 ± 0.4 and 0.6 ± 0.4 mm, 0.6 ± 0.4 and 0.6 ± 0.5 mm, respectively. For the ulna, mean rotation accuracy between 2.4 ± 1.9° and 4.7 ± 3.8° in pronation/supination, 0.3 ± 0.3° and 0.8 ± 0.6° in flexion/extension, 0.3 ± 0.2° and 0.7 ± 0.6° in radial-/ulnarduction. Mean translation accuracy between 0.6 ± 0.4 mm and 1.3 ± 0.9 mm, 0.4 ± 0.4 mm and 0.7 ± 0.5 mm, 0.5 ± 0.4 mm and 0.8 ± 0.6 mm, respectively. This technique provided high accuracy, and may replace the current method, if validated in clinical studies. © 2017 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:2630-2636, 2017.

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R_{d}

) and ulna (

U_{d}

Section: Discussionmentioning

confidence: 99%

“…The leave‐one‐out tests were performed for each of the six configurations

R_{e}

R_{d}

R_{p}

U_{e}

U_{d}

, and

U_{p}

Section: Methodsmentioning

confidence: 99%

Prediction of normal bone anatomy for the planning of corrective osteotomies of malunited forearm bones using a three‐dimensional statistical shape model

Mauler

Langguth

Schweizer

et al. 2017

Journal Orthopaedic Research

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“…The importance of CT scans for assessing the narrow zones can be well-understood from the fact that the radiographic zone portrayed by routine radiographs is larger than the actual narrow osseous zone. 13 In our literature review, we found only 3 CT-based studies 8,10,11 that studied morphometric variations of the intact scaphoid. Concerning the studied morphometric parameters, most cadaveric studies focused mainly on the mean axial length and waist dimensions.…”

Section: Discussionmentioning

confidence: 99%

Morphometric Variations of Scaphoid and Safety of Screw Fixation for Its Waist Zone Fractures in Indian Population: A Preliminary Report

Trikha

Kumar

Mittal

et al. 2019

Journal of Hand Surgery Global Online

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Surgeons fixing scaphoid fractures need to be familiar with their morphological variations and their implications for safe screw placement during fixation. The purpose of this computed tomography (CT)-based study was to analyze the anatomical limits of safe screw placement for scaphoid waist fractures in the Indian population. Methods: We measured the coronal and sagittal dimensions of the scaphoid in 3 zones: proximal, waist, and distal, in CT scans of wrists with intact scaphoids obtained from 50 live subjects. In addition, we studied the curvature of the scaphoid, its longitudinal extent, and the safe placement of trajectories for different screw diameters. Results: The proximal segment had the narrowest mean coronal width of 6.39 mm, whereas the waist region had the narrowest mean sagittal width of 9.02 mm. Mean scaphoid curvature was 132.23. Maximal bony extent of the scaphoid was significantly higher than the mean length of screw placed centrally in the mid-waist region. Conclusions: This study showed that there is a considerable amount of variation in scaphoid morphometry in Indian patients. All scaphoids capable of safely containing a single 4-mm screw or 2 parallel 1.7-mm screws coplanar in the sagittal plane. Surgeons treating these fractures should consider a CT-based analysis to plan the screw direction and length and need to be familiar with the morphometric variations of the scaphoid. Clinical relevance: The measurements and techniques in this study may be helpful in understanding morphometric variations of the scaphoid and in planning surgery for fixation of fractures around its waist region.

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“…Um die vorliegende Pathologie, insbesondere die Deformität des verletzten Skaphoides, zu erfassen, nehmen wir das gegenseitige, unverletzte Skaphoid zu Hilfe. Es hat sich nämlich gezeigt, dass das kontrolaterale Skaphoid sehr gut als Muster gebraucht werden kann, da die intraindividuellen Abweichungen in der Form und Größe minimal sind [19,20]. Die computertomografischen Daten des verletzten und des gesunden kontrolateralen Skaphoids werden segmentiert und in 3D-Oberflächenmodelle umgewandelt.…”

Section: Erfassung Der Deformitätunclassified

Kahnbeinpseudarthrose: computerassistierte virtuelle Planung der Rekonstruktion

Nagy

2020

Handchir Mikrochir Plast Chir

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ZusammenfassungDie eigentümliche Form des Kahnbeins ist eine Herausforderung für unser räumliches Vorstellungsvermögen. Deshalb bietet gerade bei der Rekonstruktion von Kahnbeinpseudarthrosen die Computer-Unterstützung unvergleichliche Vorteile: Sie ermöglicht die Erstellung eines echten 3-dimensionalen interaktiven Modells aus CTs, das manipuliert, bearbeitet und bei Bedarf sogar physisch gedruckt werden kann. Der Vergleich mit dem gesunden Kahnbein der Gegenseite analysiert die exakte Fehlstellung und erlaubt damit die Planung einer präzis-anatomischen Wiederherstellung der Kahnbeinform. Schließlich erleichtern computergenerierte patientenspezifischen Instrumente intraoperativ die genaue Umsetzung der Planung. Dieses Vorgehen ermöglicht es, das Kahnbein wesentlich exakter als zuvor wiederherzustellen und damit auch zuverlässiger die gestörte Handgelenkskinematik zu normalisieren. Unterdessen haben wir diese Technik bei der Rekonstruktion von über 50 fehlgestellten Kahnbeinpseudarthrosen erfolgreich angewandt.

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Quantification of Contralateral Differences of the Scaphoid: A Comparison of Bone Geometry in Three Dimensions

Cited by 16 publications

References 35 publications

Prediction of normal bone anatomy for the planning of corrective osteotomies of malunited forearm bones using a three‐dimensional statistical shape model

Prediction of normal bone anatomy for the planning of corrective osteotomies of malunited forearm bones using a three‐dimensional statistical shape model

Morphometric Variations of Scaphoid and Safety of Screw Fixation for Its Waist Zone Fractures in Indian Population: A Preliminary Report

Kahnbeinpseudarthrose: computerassistierte virtuelle Planung der Rekonstruktion

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