Developing a tool to measure objectively the rib hump from an instantaneous 3D scanning in a full upright position. Results of 50 scoliosis before and after plaster cas
verfasst von:
Jean Claude de Mauroy, Julien David, Pascal Genevois, Frédéric Barral, Jean Jacques Lalain
Comprehensive evaluation of the morphology of the spine and of the whole body is essential in order to correctly manage patients suffering from progressive idiopathic scoliosis. The Adams test implies a forward bending of the trunk and radiological examinations are performed in an upright position. The aim of this study is to explore the possibility to obtain a clinical measure of the rib hump in an upright position like the Cobb angle. Orten scanning system is a full 3D instantaneous measurement device in an upright position, working with structured light projection. Initially developed to avoid the plaster cast moulding, this system gives a full 3D digital representation of scoliosis. [1] The software offers many versatile and flexible solutions needed to study the patient 3D model.
Material and methods
The data from AAOP file are transcribed on an Excel spreadsheet. The cylindrical coordinates are transformed into Cartesian coordinates (X, Y, Z). The model is viewed through two graphs, one reproducing the 3D model and the other to view points of a selected horizontal section. Each horizontal plane contains 90 points. We create a fourth axis Y ' with the same origin than Y, but defining with Y a variable and controlled alpha angle by a counter “alpha position”. The coordinates of points according to this new axis are determined by: Y'p = Yp cos (alpha) + Zp sin (alpha).
Anzeige
Looking back along the modification of the angle between X axis and the tangent at the spinous process level, we visualize the rotation of the spine. Arbitrarily, the calculation of the tangent is made around the 45 ° point of each horizontal plan (180 ° ) using the coordinates point 43 and point 47. Figure 1.
Figure 1
Graphical representation of a right thoracic scoliosis with structural lumbar curve.
×
The two files before and after plaster cast are open on the same worksheet, which facilitates comparison. The reference plane is at the sacrum level.
Results
We studied 100 files before and after the initial plaster cast, comparing the gamma angle with the Bunnel ATR angle.
Qualitatively, there is a correlation between the location of the scoliosis and the visual chart. Similarly changes between the two images are proportional to the rigidity of the curve.
Anzeige
We have no correlation between the value of the gamma angle and the Bunnell ATR.
Discussion
The Orten system is an orthotics dedicated device for custom made orthosis. It can be used as a tool for measuring the asymmetry of the trunk, but the results are not comparable to that obtained by the ATR in forward bending.
Conclusion
In this work, the gamma angle and its change after plaster cast is a new objective entity which still requires much research to be used in daily practice.
Open AccessThis article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Developing a tool to measure objectively the rib hump from an instantaneous 3D scanning in a full upright position. Results of 50 scoliosis before and after plaster cas
verfasst von
Jean Claude de Mauroy Julien David Pascal Genevois Frédéric Barral Jean Jacques Lalain
Ein Frauenanteil von mindestens einem Drittel im ärztlichen Op.-Team war in einer großen retrospektiven Studie aus Kanada mit einer signifikanten Reduktion der postoperativen Morbidität assoziiert.
Sie sei „ethisch geboten“, meint Gesundheitsminister Karl Lauterbach: mehr Transparenz über die Qualität von Klinikbehandlungen. Um sie abzubilden, lässt er gegen den Widerstand vieler Länder einen virtuellen Klinik-Atlas freischalten.
Gesundheitsminister Lauterbach hat die vom Bundeskabinett beschlossene Klinikreform verteidigt. Kritik an den Plänen kommt vom Marburger Bund. Und in den Ländern wird über den Gang zum Vermittlungsausschuss spekuliert.
Der Einsatz von Operationsrobotern für den Einbau von Totalendoprothesen des Kniegelenks hat die Präzision der Eingriffe erhöht. Für die postoperative Zufriedenheit der Patienten scheint das aber unerheblich zu sein, wie eine Studie zeigt.
Update Orthopädie und Unfallchirurgie
Bestellen Sie unseren Fach-Newsletter und bleiben Sie gut informiert.
