摘要
目的观察人工合成的成骨生长肽(sOGP)经静脉应用对兔胫骨骨折愈合的影响。方法52只新西兰大白兔制成胫骨中段截骨、髓内钉固定骨折模型后,随机分为两组。实验组从术后第1d开始每天注射sOGP0.5μg·kg-1至取材前1d,对照组注射同样剂量的生理盐水。分别于术后第1、2、3、4、6周每组宰杀3～5只,测定血清ALP、BGP;同时取材测定骨折端骨密度、摄X线片后,再行组织学检查和形态分析,观察骨痂的大小及其组成成分的变化;其中术后6周的标本还进行了生物力学测定。结果实验组血清ALP、BGP水平高于对照组。X线片显示两组骨折均愈合,第3、4周实验组外骨痂平均面积比对照组大,3周时为265.44mm2、209.95mm2,4周时为233.10mm2、209.21mm2。第3、4、6周的骨密度实验组均大于对照组,其中第4周的骨密度经F检验两组的差异具有显著性(P<0.05)。组织学形态分析显示第2、3、4周的外骨痂平均面积实验组比对照组大;所有实验组外骨痂中小梁骨占骨痂总面积的百分比均高于对照组,其中第2、4周经F检验两组的差异具有显著性(P<0.05)。第6周骨折端平均最大破坏载荷及最大位移实验组比对照组高,但差异没有显著性(P>0.05)。结论全身应用sOGP对不稳定固定的兔胫骨横断骨折的愈合具有一定的促进作用。
Objective To evaluate the effects of the synthetic osteogenic growth peptide (sOGP) on the healing of tibial fractures in rabbits. Methods Fifty two tibial fracture models were produced in the tibiae of New Zealand white rabbits and immobilized with a 2 mm diameter Kirschner wire as intramedullary nail and grouped by random. sOGP was administered to experimental animals by intravenous injection (0.5 μg·kg-1 ·d-1) from the first day after surgery until the day before sacrifice, while the control animals were injected with saline solution. 3-5 rabbits from each group were killed at 1, 2, 3, 4, 6 weeks after fracture. The serum was obtained to determine the level of ALP and BGP by biochemistry and RIA respectively. The bone mineral density at fracture healing site was detected by DXA, the anteroposterior and lateral radiographs were taken, the histological examination was done and quantitative analysis of the callus area and the relative amounts of bone, cartilage, and fibrous tissue in the callus of each section were calculated by computer program. The 6 weeks tibial sample were tested biomechanically by universal material test machine. Results The serum ALP, BGP level were higher in sOGP injected groups than those in the controls. All tibia osteotomies healed uneventfully on radiograph. The area of the external callus was larger in the experimental groups than that in controls at 3,4 weeks after fracture; the average area was 265.44 mm2 at 3 weeks, 233.10 mm2 at 4 weeks in the experimental groups compared with that of 209.95 mm2 at 3 weeks and 209.21 mm2 at 4 weeks in the controls. The average bone mineral density at fracture healing site was slightly greater in the experimental group at 3,4,6 weeks, and the difference of the bone mineral density at 4 weeks has statistical significance (P< 0.05). Quantitative analysis of histological examination showed that the overall size of the external calluses was greater for the experimental groups than those of the controls at 2,3,4 weeks. The amount of external callus in the experimental group was greater than that in the control group at each period, and the difference at 2, 4 weeks had statistical significance (P< 0.05). The biomechanical test results also showed the average peak load and peak deformation of the fracture healing site at 6th week were greater in the experimental group, but there was no statistical significance. Conclusion Systemically administering sOGP 6 weeks after fracture may play some significant role in the healing of tibia fracture under intramedullary fixation in New Zealand white rabbits.
出处
《中华骨科杂志》
CAS
CSCD
北大核心
2002年第3期165-170,共6页
Chinese Journal of Orthopaedics
关键词
肽合成
骨生成
骨折愈合
胫骨骨折
人工骨
Peptides
Peptide synthesis
Osteogenesis
Fracture healing
Rabbits
