As you proceed through this case you will need to keep an open mind and examine all of the potential diagnoses that you can hypothesize. In real life it would be nice if every patient presented as a clear cut diagnosis, however this is rarely the case.
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2. Distinguishing transient osteoporosis from avascular necrosis of the hip. Guerra et al. The Journal of Bone and Joint Surgery. 1995. Vol 77 Page 616.