Final answer:
A fracture that fails to heal despite treatment is known as a Nonunion, often resulting from inadequate stabilization, certain drug therapies, or underlying bone diseases like osteoporosis or bone cancer.
Step-by-step explanation:
A fracture that fails to heal despite treatment is known as a Nonunion. This condition occurs when a broken bone does not heal properly, even after an extended period and with adequate treatment. Factors like the fracture type, inadequate stabilization, drug therapy, and pre-existing bone disease may contribute to this complication. It is important to note that bones weakened by conditions such as osteoporosis or bone cancer may heal more slowly and have a higher risk of fracturing.