In 1958, the AO formulated four basic principles, which have become the guidelines for internal fixation.¹

Anatomic reduction
Fracture reduction and fixation to restore functional anatomical relationships.

Stable fixation
Stability by rigid fixation or splintage, as the personality of the fracture and the injury requires.

Preservation of blood supply
Preservation of the blood supply to soft tissue and bone by careful handling and gentle reduction techniques.

Early mobilization
Early and safe mobilization of the part and patient.