Biomechanical evaluation of peak reverse torque (PRT) in a dynamic compression plate-screw construct used in a goat tibia segmental defect model

Background Peak reverse torque (PRT) is a valid method to evaluate implants’ secondary stability in the healing bone. The secondary stability is achieved by the implant over time and it has been positively correlated with the implants’ osseointegration level. In other words, peak reverse torque is the force required to break the bone-implant interface. The purpose of this study was to compare the peak reverse torque for the self-tapping and non-self-tapping screws used in a dynamic compression plate–screw–bone construct after 60 days of loading when used to stabilize 2.5-cm defects in the tibia of goats. The second objective was to compare the peak removal torque of the screws placed in the different positions to evaluate the impact of construct biomechanics on implants osseointegration.
Results In total, 176 non-self-tapping screws and 66 self-tapping screws were used to fix the 8-holes dynamic compression plates to the bones. The screws were placed in the tibiae from proximal (posi...

研究背景：反向峰值扭矩（Peak reverse torque，PRT）是评估愈合期骨组织内植入物继发稳定性的有效方法。继发稳定性随时间在植入物上逐步建立，且与植入物的骨整合水平呈正相关。简言之，反向峰值扭矩即为破坏骨-植入物界面所需的作用力。本研究旨在对比经60天加载、用于稳定山羊胫骨2.5厘米骨缺损的动态加压钢板-螺钉-骨复合体中，自攻螺钉与非自攻螺钉的反向峰值扭矩；次要目的为对比不同植入位置螺钉的取出峰值扭矩，以评估复合体生物力学对植入物骨整合的影响。
研究结果：总计使用176枚非自攻螺钉与66枚自攻螺钉，将8孔动态加压钢板固定于骨组织。螺钉被植入胫骨的近端（posi...）