BMP2 and infection: Interestingly, there was no pin tract infection or pin loosening in the (IMI + B2) and (IMI + B6) groups, suggesting that BMP-2 released from the implants enhanced the osseointegration between pins and surrounding bone, and more importantly, accelerated bone healing in both docking and regenerate sites, leading to improved mechanical stability, reduced motion at the pin-bone interface, and lowered the loosening risk that can contribute to infection.