[Traumatic acromio-clavicular pathology].

Based on clinical and radiological findings, four types of acromioclavicular disjunction are described. Stage I and II require nothing more than orthopaedic appliances, whereas surgery is mandatory in stage IV. Treatment of stage III disjunctions varies from on school of orthopaedists to the other. Fractures of the lateral third of the clavicle may lead to diagnostic errors, and tomography is justified at the slightest doubt concerning the integrity of the acromial end of that bone.