What is a typical use of bone scintigraphy (bone scan) in extremity pathology?

What is a typical use of bone scintigraphy (bone scan) in extremity pathology?

• A. Evaluate ligaments
• B. Detect occult fractures, occult infection, or monitoring certain bone conditions
• C. Assess cartilage
• D. Determine age of fracture

Answer: (B)

Bone scintigraphy uses a radioactive tracer that accumulates in areas of increased bone turnover. In extremity pathology, this makes it especially useful for uncovering occult fractures that aren’t visible on X‑rays yet and for detecting occult infections such as osteomyelitis, since infection drives bone remodeling and shows up as hot spots. It can also help monitor various bone conditions over time, including metastatic disease or prosthetic loosening, where changes in uptake reflect activity. It isn’t used to evaluate ligaments or cartilage directly, because those tissues aren’t highlighted by a bone turnover tracer. Nor is it a precise tool to determine the exact age of a fracture; while patterns can suggest healing stages, the exact timing isn’t determined.

Bone scintigraphy uses a radioactive tracer that accumulates in areas of increased bone turnover. In extremity pathology, this makes it especially useful for uncovering occult fractures that aren’t visible on X‑rays yet and for detecting occult infections such as osteomyelitis, since infection drives bone remodeling and shows up as hot spots. It can also help monitor various bone conditions over time, including metastatic disease or prosthetic loosening, where changes in uptake reflect activity.

It isn’t used to evaluate ligaments or cartilage directly, because those tissues aren’t highlighted by a bone turnover tracer. Nor is it a precise tool to determine the exact age of a fracture; while patterns can suggest healing stages, the exact timing isn’t determined.