山羊胫骨大段骨缺损的组织工程骨修复及放射性核素显像监测

目的：探讨组织工程骨对山羊大段骨缺损的修复能力及放射性核素骨显像技术在此过程中的监测效果。方法：将27只中国青山羊，分为组织工程骨组，人工骨组和对照组（每组9只）并分别造成左侧胫骨2cm缺损，对组织工程骨组缺损区植入珊瑚羟基磷灰石（CHAP）和骨髓基质干细胞（BMSc)复合体，人工骨组植入CHAP，对照组则不植入任何填充物，采用放射性核素骨显像于术后2，4，8周监测各组骨修复情况。结果：通过放射性核素骨显像测定的感兴趣区（ROI）计数和T／NT比值显示：对照组在各时间点均未见再管化的表现及明显的成骨活动；人工骨组随着时间的延长其血管再生的数量和成骨的质量呈现出上升的趋势。组织工程骨组上升趋势更为显著。结论：组织工程骨较人工骨具有更佳的修复大动脉大段骨缺损的能力，放射性核素骨显像在修复过程中有比较准确的预测效果。

Repair of tibial defect with tissue-engineered bone graft and radionuclide bone imaging in goats]

OBJECTIVE: To observe the effect of tissue-engineered bone grafts in repairing large tibial defect in goats, and assess the value of radionuclide bone imaging in monitoring the therapeutic effect of this approach. METHODS: Tibial defects measuring 2 cm was artificially made in the left tibia of 27 normal goats that were subsequently divided into 3 groups (9 each) to undergo treatment with tissue-engineered bone grafts, artificial bone grafts or without any grafts (as control group) respectively. The tissue-engineered bone grafts contained bone marrow stroma cells (BMSCs) of the goats and coral hydroxyapatite (CHAP), while the artificial bone grafts were from CHAP only. After the operations, radionuclide bone imaging was used to monitor the therapeutic effects at 2, 4 and 8 postoperative weeks. RESULTS: The 99mTc-MDP uptake of the region of interest (ROI) and the target to non-target ratios (T/NT) of the control group did not indicate any process of revascularization or bone regeneration. An increasing tendency of the revascularization and bone regeneration, in contrast, was observed in goats receiving the artificial bone grafts, a tendency that was far more obvious in the goats with tissue-engineered bone grafts. CONCLUSION: Tissue-engineered bone graft is eligible in repairing large defect in the caprine tibia, and radionuclide bone imaging may accurately monitor the revascularization and bone regeneration after the bone graft implantation.