Flat bones consist of spongy bone sandwiched between compact bone. is this statement true or false?10/17/2023 Bone tissue engineering is a newer option than the traditional grafts and may overcome many limitations of the bone graft. Nevertheless, these organic and synthetic materials and therapeutic agents have some significant limitations, and there are still no well‐approved treatment modalities to meet all the expected requirements. Different types of growth factors, stem cells, natural grafts (autografts, allografts or xenografts) and biologic‐ and synthetic‐based tissue‐engineered scaffolds are some of the examples. Different therapeutic modalities have been developed to enhance the healing response and fill the bone defects. Repair of large bone defects resulting from trauma, tumours, osteitis, delayed unions, non‐unions, osteotomies, arthrodesis and multifragmentary fractures is a current challenge of surgeons and investigators. They are not always present.Fracture healing is a complex physiological process, which involves a well‐orchestrated series of biological events. Sutural bones are very small bones that are located between the major bones of the skull, within the joints (sutures) between the larger bones.The patella (knee cap) is an example of a sesamoid bone. Sesamoid bones hold tendons farther away from joints so the angle of the tendons is increased, thus increasing the leverage of muscles. Sesamoid bones are embedded in tendons, the connective tissues that bind muscles to bones.Most of the bones of the skull are flat bones, as is the sternum (breast bone). Flat bones are thin and generally curved, with two parallel layers of compact bone sandwiching a layer of spongy bone.The bones of the wrists and ankles are short bones. Short bones are roughly cube-shaped and have only a thin layer of cortical bone surrounding a spongy bone interior.Most bones of the limbs, including those of the fingers and toes, are long bones. Long bones are made mostly of compact bone, with lesser amounts of spongy bone and marrow. Long bones are characterized by a shaft that is much longer than it is wide and by a rounded head at each end of the shaft.
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