Abstract
This study investigated the effect of plasmid cytomegalovirus (pCMV)-bone morphogenetic protein 2 (BMP-2) gene therapy on the healing of the tendon-bone interface after anterior cruciate ligament (ACL) reconstruction in rabbits. The pCMV-BMP-2 was synthesized from full-length human BMP-2 complementary deoxyribonucleic acid, followed by cloning into pCMV Script vector (Clontech Laboratories, Inc., San Jose, CA), and was delivered by a xenogeneic (rat kidney) cell line. The ACL was reconstructed by the transfer of extensor digital tendon in the proximal tibia. In the study group the pCMV-BMP-2 gene-transfected normal rat kidney cells mixed with calcium alginate gel were placed at the tendon-bone interface, whereas no pCMV-BMP-2 was used in the control group. The evaluations included radiography, bone mineral density, magnetic resonance imaging, biomechanical study, histologic examination, and immunohistochemical analysis. Bone mineral density showed no significant difference between the groups (P > .05). Magnetic resonance imaging showed significantly better contact between tendon and bone in the study group compared with the control group (P < .0001). In the biomechanical study, significantly higher failure load and maximal graf...Continue Reading
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