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Defining the shape of the scapulothoracic gliding surface
Tomas Paquet1, Robin Van Den Broecke2, Stijn Casier2
1Department of Orthopaedic Surgery and Traumatology, Ghent University Hospital, De Pintelaan 185, 9000, Ghent, Belgium. Tomas_Paquet@hotmail.com.
Surgical and Radiologic Anatomy : SRA
|October 17, 2019
Summary
The upper Scapulothoracic Gliding Surface (STGS) is more spherical than the lower STGS. This finding suggests differences in thoracic wall shape between ribs 2-5 and ribs 5-8.
Area of Science:
- Thoracic anatomy
- Biomechanics
- Medical imaging
Background:
- The Scapulothoracic Gliding Surface (STGS) is crucial for shoulder function.
- Understanding the 3D shape of the STGS is important for diagnosing and treating scapular dyskinesis.
Purpose of the Study:
- To compare the spherical shape of the upper STGS (ribs 2-5) with the lower STGS (ribs 5-8).
Main Methods:
- 3D-CT images of 50 patients' thoracic cages were analyzed.
- The STGS was defined using anatomical landmarks and segmented into upper (ribs 2-5) and lower (ribs 5-8) parts.
- Best-fit spheres were calculated for each part, and Root-Mean-Square Error (RSME) determined the goodness-of-fit.
Main Results:
- The upper STGS (ribs 2-5) showed a significantly lower RSME (mean 7.85 mm) compared to the lower STGS (ribs 5-8, mean 10.08 mm).
- This indicates a more spherical shape in the upper thoracic region.
Conclusions:
- The Scapulothoracic Gliding Surface of the upper thoracic wall (ribs 2-5) exhibits a more spherical geometry than the lower thoracic wall (ribs 5-8).
- These shape differences may have implications for scapular kinematics and thoracic spine biomechanics.
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