autogenous graft造句

• The disadvantages of dual grafts are the same as those of single cortical grafts : ( 1 ) they are not as strong as metallic fixation devices ; ( 2 ) an extremity must usually serve as a donor site if autogenous grafts are used ; and ( 3 ) they are not as osteogenic as autogenous iliac grafts , and the surgery necessary to obtain them has more risk
  双侧植骨的缺点与单侧皮质骨植骨的缺点相似：强度不如金属固定器械；采用自体骨移植时必须选择肢体作为供区；成骨性能不如自体髂骨移植，取骨手术也有更大的风险。