Mr. Ramon, who is 70 years old and has had a long history of osteoporosis, noticed that the movements of his right hip felt restricted and painful whenever he tried to walk. When he went to the...

Mr. Ramon, who is 70 years old and has had a long history of osteoporosis, noticed that the movements of his right hip felt restricted and painful whenever he tried to walk. When he went to the doctor, he was told that he might have already fractured a bone. Which bone has he fractured? How did it happen?