Final answer:
The sixth step of bone healing is remodeling, where compact bone replaces spongy bone, corresponding to a full recovery with the potential for no evidence of past fractures.
Step-by-step explanation:
The sixth step in the fracture and healing process is known as remodeling. During remodeling, compact bone replaces spongy bone at the outer margins of the fracture, which completes the healing. This process allows the bone to adapt to stresses and become stronger. Remodeling occurs after the internal and external calli have formed and the cartilage of the calli is replaced by trabecular bone. During remodeling, the bone undergoes changes to restore its strength and shape. This process may take several months to complete. Any slight swelling that may have remained on the outer surface of the bone often undergoes further remodeling, and eventually, there may be no external evidence of the prior fracture.