Not according to the last doctor I asked about it.
The cruise liner, QE2, moves only six inches for each gallon of diesel that it burns.
This seems highly suspect; it would mean the ship burns 10,000 gallons per mile ... 10 million gallons (a quarter-million barrels) for 1000 miles.
Although it doesn’t show up on X-rays, your baby does in fact have kneecaps. They’re just not bony kneecaps. At birth, these kneecaps are still cartilage, and remain so for a few years. So all those spills and falls your toddler is taking aren’t going to be knee-breakers, just sponge-compressors. By the time your child is anywhere from 3 to 5 years old, those cartilage plates will have fully ossified into big-kid kneecaps, made of real bone.
http://health.howstuffworks.com/human-body/systems/musculoskeletal/babies-kneecaps1.htm