This study examines the microcirculation of the caput humeri after proximal humeral fracturation using O2C light probes.

During the operation the blood circulation is measured at four points (tuberculum majus, tuberculum minus, neck and head of the humerus) directly on the bone. The O2C light probes are a none-invasive technique of measuring blood flow, velocity and oxygen concentration. The data is analysed in respect to the fracture type according to the classification of Neer.

Valuable additional information for the correct treatment and prognosis of humeral fractures is expected.

Inclusion Criteria:

• traumatic fractures of the proximal humerus
• surgical treatment
• over eighteen years of age

Exclusion Criteria:

• pathological fractures
• conservative treatment
• soft tissue damage
• delay of surgery more than three days
• immunological defects
• multiple trauma

All patients that are treated for proximal humeral fratures in the University hospital of the RWTH Aachen University.