discussed separately Students are expected to write in their own words and NOT t
ID: 212224 • Letter: D
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discussed separately Students are expected to write in their own words and NOT to cut and paste from another source 1. An individual has a broken humerus that requires a cast and immobilization for 6 weeks. At the end of treatment, an X-ray reveals that the injury has healed very nicely but that the overall mass of the entire bone is less when compared to the other arm. The patient has consumed adequate calcium and vitamin D during recovery. Given this fact, why is the bone mass reduced? 2. Ten year old Sally, playing on her swing set, falls and breaks her right leg. At the emergency room doctors tell her parents that the proximal end of the tibia (shin bone) where the epiphyses meet the diaphysis is fractured. The fracture is properly set and heals well. When she is eighteen, Sally begins to have problems with her hip. When she goes to an orthopedic physician she learns her right leg is slightly shorter than her left. Explain what might account for this difference. 3. Sherry is a pregnant teenager. Her diet consists largely of junk food. Approximately 12-14 weeks into her pregnancy she falls and breaks her arm. She doesn't understand why the bone broke because it was not a hard fall. Test results show a significant amount of bone demineralization is occurring in her skeleton. Cite two different causes for this demineralization in Sherry and explain how each is producing its effect.Explanation / Answer
1.This is because the area under the fracture starts to heal by forming a callus where calcium deposits to help in rebuilding of the bone.The area under the fracture undergoes rapid mineralization but not the rest of the bone.Also,since the fractured hand cannot be used due to fracture,the other parts of the bone excluding the fracture undergoes demineralization and hence the bone mass is reduced.
2.The epiphyseal plate might have damaged on fracture which indicates that despite the bone healing properly, enough cartilage was not produced by the damaged leg in comparision to the undamaged leg.
3.The two reasons are :
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