Figure 4. (A) With the aid of a C-arm image intensifier, a closed reduction was made by using a Kirschner wire to push the clavicle into the anatomical position. (B) The Knowles pin from the acromion tip that crossed the acromioclavicular joint (ACJ) to the distal clavicle achieved cortical anchoring over the posterior aspect of the distal clavicle. The ACJ space was maintained by the lag screw technique when using the Knowles pin fixation method. (C) Postoperative radiograph showing a good reduction in ACJ dislocation treated with closed reduction with percutaneous Knowles pin fixation.