Thoracic outlet syndrome (TOS) may complicate the activities of sporty subjects that participate in sports that involves upper extremities activities, such as baseball, tennis, swimming, rowing, volleyball, rugby football, and weightlifting. Disability and postintervention recovery related to TOS treatment and possible surgery may have a significant impact in the overall performance abilities of athletes. This study aims to detect the early predisposition of athletes to TOS onset, by means of computational fluid dynamics (CFD) analysis of thoracic outlet region.

Repetitive upper extremity use in athletes may be associated with the development of neurogenic and vascular thoracic outlet syndrome (TOS) which typically presents as upper extremity symptoms caused by compression of the neurovascular structures in the area of the neck above the first rib. Clinical manifestations can include upper extremity pain, paresthesias, numbness, weakness, fatigability, swelling, discoloration, and Raynaud phenomenon. Vascular TOS can involve the subclavian artery or vein.

Most patients who suffer TOSs have an anatomical predisposition and sport activities of upper limbs may contribute to TOS onset. Disability and postintervention recovery related to TOS treatment and possible surgery can have a significant effect in the overall performance abilities of affected patients, and little has been published specifically about the risk of TOS athletes. Computational fluid dynamics (CFD) analysis is one of the key analysis methods used in bioengineering applications in studying the cardiovascular system. In this context a typical fluid dynamics analysis involves evaluation of basic fluid properties like flow velocity, and pressure, in relation to time and space.

This study aims to study CFD factors in thoracic outlet region (cervicothoracobrachial region) in order to evaluate the fluid - structure interactions between muscles, bones and vessels in this region in sporty subjects that participate in the following sports: baseball, tennis, swimming, rowing, volleyball, rugby football, weightlifting.

A cohort of healthy sporty subjects will be recruited and will undergo to diagnostic tests in order to assess the thoracic outlet region. For this reason, a Magnetic Resonance scan of the cervicothoracobrachial region and a duplex ultrasound of the upper limbs will be performed.

COMSOL Multiphysics ® cross-platform will be used for elements analysis, in the simulation study. The simulation will be implemented with FreeCAD 3d modeling in order to 3D geometry of studied elements.

The primary endpoint of this study is to calculate the risk of TOS onset in sporty subjects in order to prevent a disabling disease in this kind of subjects.

Inclusion Criteria:

For "Sporty" Group:

sporty subjects that participate in the following sports: baseball, tennis, swimming, rowing, volleyball, rugby football, weightlifting

For "Non-Sporty" Group:

Subject not involved in sport activities

For both groups:

Exclusion Criteria:

• presence of muscular or bone problems,
• presence of peripheral arterial disease,
• presence of malignant tumors,
• presence of serious cardiovascular and cerebrovascular pathologies,
• presence of renal and hepatic insufficiency
• subjects diagnosed with thoracic outlet syndrome or with symptoms related to the aforementioned syndrome.

The population is represented of healthy sporty and non-sporty people that have no symptoms of thoracic outlet syndrome at the moment of observation.