My son is 6 1/2 he had been complaining of calf pain a few days in the last few weeks. When he did complain it was always in the morning and it was just his calves. He had a fever around 7-10 days ago that lasted a couple of days. His pediatrician wanted him to be tested for MD, but from looking online I don't see that he exhibits many of the symptoms. Other than occasional pain in his calves in the morning, he is very active and can do jumping jacks and push ups and swims almost everyday. I am worried about possible MD, but could it have just been the fever. His CK level was 387, I want to have him tested again to see if it went down. He has not complained of any pain the last few days and has been very active. The pediatrician wants to wait for the orthopedic surgeon to see him to have them do lab work.