Reaming debris in osteotomized sheep tibiae

Background: Reamed nailing gives better fracture healing than unreamed nail ing in operative treatment of fractures and nonunions, This study investiga tes the effect of isolated reaming debris on fracture healing in an animal model. Methods: Thirty sheep were treated with an osteotomy of the tibia with 5-mm distraction. In one group, the osteotomy gap was left empty; in the second group, the gap was packed with reaming debris from the ipsilateral femur; and in the third group, the gap was packed with cancellous bone from the il iac crest. At followup, callus volume was measured on standard radiographs. Results: After 3 weeks, callus volume from the reaming debris group as web as the iliac crest group had increased significantly compared with the empt y group. Conclusion: This study shows that isolated reaming debris supports callus b uilding as much as conventional bone grafting, which might explain why frac tures heal with more callus formation when treated with reamed nailing comp ared with unreamed nailing.