Effects of a novel biodegredable implant system on a rat tibia fracture model

Objective: This study aimed to determine the effects of a novel biodegradable implant releasing platelet-derived growth factor (PDGF) at the fracture site on fracture healing in a rat tibia fracture model. Methods: In this study, 35 male Sprague-Dawley rats weighing between 300 and 350g were used. The rats were divided into four groups: Group A (control group without any treatment, n=10), Group B (spacer without PDGF Group, n=10), Group C (spacer with PDGF group, n=10), and Group D (healthy rat Group, n=5). Standardized fractures were created in the right tibias of rats, and then biodegradable implants made of poly-β-hydroxybutyrate-co-3-hydroxy valerate were implanted at the fracture sites in Groups B and C. In Group C, implants were loaded with 600 ng of PDGF. Animals were sacrificed 30 days after the operation, and fracture healing in each group was assessed radiologically based on the Goldberg score. Furthermore, the anteroposterior (AP) and mediolateral (ML) callus diameters were measured macroscopically, and fracture sites were mechanically tested. Results: In the radiological assessment, Group C showed higher fracture healing rate than Groups A and B (p=0.001), whereas no significant difference was found between group C and Group D (p>0.05). In the macroscopic assessment, while Group C exhibited the thickest AP callus diameter (p=0.02), no significant differences in ML callus diameters existed among the groups (p>0.05). Mechanical testing revealed that Group C had higher torsional strength (p=0.001) and stiffness than Groups A and B (p=0.001) while there was no significant difference between Groups C and D (p>0.05).

Kaynakça

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