The purpose of this study was to evaluate the clinical results of the surgical treatment of acromio-clavicular joint dislocations and distal clavicular fractures with wolter clavicular plates. Four patients with acromio-clavicular joint dislocations classified as Tossy's grade III and 6 patients with distal clavicular fractures classified as Neer's type II were treated between November 1998 and January 2000. All the patients were men and their mean age at surgery was 46.8 years. The mean follow-up period was 1 year and 2 months. The average JOA shoulder score was 95.3 points at the time of evaluation. Wolter clavicular plates firmly fix the acromio-clavicular joint at the anatomical position with no damage to the joint. Post operative rehabilitation can be started earlier than other surgical techniques, contributing to excellent results. However, in the case of one case of 82-year-old, the hook of the plate was cut out from the acromion 2 months after the operation. For elderly patients with osteoporosis, the post operative management shoud be performed carefully, and the hook hole of the plate must not be enlarged when inserting the plate for a long time, regardless of the score that is assigned after the operation.