Which surgical site allows for the largest bone harvest among the given options?

The posterior iliac crest is recognized as the surgical site that allows for the largest bone harvest. This is primarily due to its anatomical structure and the volume of cancellous bone available. The posterior iliac crest is wider and has a greater surface area compared to the anterior iliac crest, providing more space for obtaining a larger block of bone, which is beneficial for various reconstructive procedures in oral and maxillofacial surgery.

Additionally, harvesting bone from the posterior iliac crest generally has fewer complications related to the abdominal structures compared to the anterior iliac crest, where proximity to internal organs may increase risks. The posterior site is also associated with a lower morbidity rate and better healing, making it a preferred choice for larger grafts.

In comparison, the tibia and zygomatic arch are not as favorable for extensive bone grafting. The tibia has a limited area for harvesting and is more prone to complications such as fracture or delayed healing. The zygomatic arch typically provides a much smaller volume of bone and is more often used for grafting smaller amounts, making it unsuitable for cases requiring substantial bone quantity.