The advantages of dual grafts for bridging defects are as follows : ( 1 ) mechanical fixation is better than fixation by a single onlay bone graft ; ( 2 ) the two grafts add strength and stability ; ( 3 ) the grafts form a trough into which cancellous bone may be packed ; and ( 4 ) during healing the dual grafts , unlike a single graft , prevent contracting fibrous tissue from compromising transplanted cancellous bone 双侧植骨桥接骨缺损的优点包括：机械固定作用比单侧贴附植骨更好；双侧植骨可增加强度和稳定性；双侧的植骨可形成一骨槽，可在其中压紧松质骨；与单侧植骨不同，双侧植骨在愈合过程中可防止挛缩的纤维组织危害移植的松质骨。
