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In brief: Time. Becareful of the term dislocates ribs. The small rib joints (where they attach) can get sprained but rarely completely dislocate. Either way, they will take their time to heal. Occasionally therapy may be helpful for any soft tissue massages.
1 Ligaments attaching ribs to the sternum or spinal column.  Soft tissue surrounding the dislocation or subluxation site, including periosteum (covering to bone), nerves, tendons, blood vessels and connective tissue.