Noah Beckenstein went to weight-lifting camp in the summer between seventh and eighth grade. He noticed that the camp trainer put tremendous pressure on him and his friends to improve their strength. After an especially vigorous workout, Noah's arm felt extremely sore and weak around the elbow. He went to the camp doctor, who took X rays and then told him that the injury was serious, for the 'end of his upper arm bone was starting to twist off.' What had happened? Could the same thing happen to Noah's 23-year-old sister, Karen, who was also starting a program of weight lifting? Why or why not?

Video transcript

Hi, everyone. Let's look at our next question. Which of the following is a type of fracture that is caused by twisting or torsional stress in the bones and can happen to any long bone in the body. But most frequently occurs in the tibia. And the femur choice, a compression fracture fracture. B, greenstick fracture, C, open fracture or D spiral fracture. Well, you can find the term, it can kind of help you to find the term if you imagine what kind of fracture would take place with a twisting motion. And that can lead you to the answer of choice D spiral fracture, a twisting motion and the injury leading to a spiral break in the bone. And indeed a spiral fracture is one where the break spirals around the bone. Let's look at our other answer choices to understand why they are not correct. We have choice. A compression fracture and a compression fracture occurs again. The name gives it kind of gives us the key here when the bone has collapsed or is compressed due to excessive force. So bone collapsed. And the most common location of this is in the spine to the vertebrae. But not one due to twisting or torsional stress. So not our answer choice. B Greenstick fracture is one where the break does not go all the way through the bone. And the name green stick fracture comes from the comparison to green wood. If you had a green piece of wood and you try to break it in half, it's very flexible and bendy. So it might bend very far and start to break, but it would be very hard to break it all the way through. And indeed, in a green stick fracture, b bone bends and partially fractures, but that break doesn't go all the way through. These are common in Children because their bones are more flexible, just like green wood, but not what we're looking for. So, cross that out and then finally to see an open fracture is one in which the bone protrudes through the skin. And obviously, these are very serious breaks uh and a result of very serious injury. So, but not our answer choice to cross that out. So again, the type of fracture caused by twisting or torsional stress most frequently occurring in tibia and femur choice D spiral fracture. See you in the next video.