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The Sphenobasilar Synchondrosis (SBS) as a central part of the base of the skull

Journal: Unpublished MSc thesis Wiener Schule für Osteopathie, Date: 2007/01, Pages: 54, type of study: retrospective study

Free full text   (https://www.osteopathicresearch.org/s/orw/item/2962)

Keywords:

computed tomography [7]
landmark relocation error [1]
sas [6]
shift [7]
skull base [3]
WSO [433]
retrospective study [213]

Abstract:

The purpose of this master thesis is to find out shifts at the SBS which can be demonstrated by means of computed tomography in sagittal plane. We retrospectively reviewed paranasal sinuses CT images from 76 male and 62 female patients (n=138) aged 20 to 86 years. Before starting the analyses, we assessed accuracy of our measurement method by evaluating landmark relocation error (LRE). We got excellent results (LRE: 0.2mm, range: -0.28mm to 0.60mm). In a primary selection we tried to find out all cases of interest. There were 4 cases (2m/2f) with minimal changes. We analysed them from a radiological and osteopathic viewpoint. Because variations were minimal and only at a small part of SBS, they can be interpreted radiological as intra-osseous lesions with alteration of structure. From an osteopathic viewpoint, it also can be a minimal torsion or side bending/rotation lesion. At one male person we found greater alterations with relevant variation of the SBS. We tried to determine the degree of shifting for this particular case. Shift was assessed at upper and lower part of SBS by using double determination for valid results. We found a sinuous alteration of 1.7mm (SO: 0.49mm, range -0.30 to 0.40) for the upper part and 2.2mm (SO: 0.46mm, range -0.50 to 0.30) for the lower part. From an osteopathic viewpoint it can be interpreted as an inferior vertical strain. Our study shows that shifts of the SBS do exist. To a great part they are minimal and it needs high quality scans with specific investigations at area of interest. Considerable shifts seem to be rare. We only assessed position of SBS. There is no evidence about motion or clinical aspects in this master thesis. Nevertheless we can corroborate our hypothesis. Perhaps it can clear the way for further investigations especially to clinical (osteopathic) claims.


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