The posttraumatic synostosis can occur anywhere between the radius and ulna along the length of the interosseous membrane. The most common cause of posttraumatic radioulnar synostosis is operatively treated forearm fracture. There are many causes rather than surgical. The indication for surgery in posttraumatic radioulnar synostosis is functional limitation of forearm rotation. Traumatic synostosis is amenable to surgical excision. There are variable surgical options as Excision, muscle interposition, free vascularized fat transplant, bone wax and silicone sheet.