The thoracic outlet is located between the first rib, the clavicle, and the scalene muscles. The brachial plexus and the subcalvian artery pass between the anterior and medial scalenes muscles, the first rib, and the overlying clavicle. The brachial plexus and the sbuclavian artery can be compressed as they pass between the thoracic outlet. The lower roots of the brachial plexus (C8-T1) or ulnar nerve are at high risk than the more superior roots because of their location in the plexus.
TOS is also known as scalene anticus syndrome, hyperabduction syndrome, cervical rib sundrome, costoclavicular syndrome and pectoralis minor syndrome.
Causes of TOS:
- Mechanical: repetitive stress, overuse, poor posture, muscle spasm, decondition or artrophy.
- Traumatic: penetration injury
- Congenital: cervical rib
- Vascular
- Infeciton
- Idiopathic
Conservatice treatments for TOS:
- Self care tips: improvement in posture, office ergonomics, modification in work related posture habits, cervical traction, stretching
- Treatment in our clinic: a few options, myofascial release technique, PIR stretching, In office posture training for cervical and thoracic spine, strengthen weak muscles, chiropractic adjustment for neck, upper back and first rib, and medical massage.
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