Final answer:
Knee dislocations can reduce spontaneously and may not present with any gross external or radiographic anomalies until a physical exam of the joint is performed.
Step-by-step explanation:
The statement that knee dislocations can reduce spontaneously and may not present with any gross external or radiographic anomalies until a physical exam of the joint is performed is True.
Knee dislocations occur when the tibia and femur bones lose their normal alignment in the joint. While some dislocations require manual reduction to realign the bones, others can reduce spontaneously without medical intervention.
These dislocations may not be immediately apparent without a physical exam because they may not produce obvious external or radiographic abnormalities. It is essential to perform a thorough physical examination to evaluate the joint's stability and any underlying ligament or muscle injuries.