Thoracic Inlet Syndrome After Surgically Treated Clavicle Fracture.

A 25-year-old female patient complained of intermittent pseudoradicular, ulnar-accentuated tingling paraesthesias of the right arm, accompanied by swelling and cyanotic skin discolouration of the forearm 9 days following plate osteosynthesis of a clavicle shaft fracture in the middle third (OTA classification type B). CT angiography revealed almost complete obstruction of the lumen of the subclavian vein at the junction between the clavicle and the first rib, which was consistent with a thoracic inlet syndrome. This was triggered by a haematoma of the concomitantly fractured first rib and a cortical screw protrusion in the area of the constriction between the clavicle and the first rib. Revascularisation was achieved by evacuating the fracture haematoma, partial resection of the first rib, and replacement of the two protruding screws. This case demonstrates that screw protrusion must be avoided during plate osteosynthesis of clavicle shaft fractures, particularly in the medial third of the clavicle - due to its proximity to the first rib. Injuries to the subclavicular neurovascular bundle can be comprehensively detected and treated by resection of the first rib.