Primary or secondary bone tumours are not uncommon in pelvic girdle. In some cases, after radical resection, there is a big bony defect where the prosthesis is not applicable; arthrodesis is the only choice for good functional results. In this instance, the major problem is to achieve the fusion. In this case report, we focused on easy harvesting and minimal time consumption with free vascularized rib graft to achieve the fusion between the resected segments. Two year follow up showed fusion with good functional result.