Hip Pain in an 80-Year-Old Woman

Case
An 80-year-old woman presents to an urgent care center with left hip pain that she has had for 4 years but that has worsened in the last week. She reports that before the pain worsened, she had gone on a long walk with her grandson. The pain is worse with movement through the range of motion. She has taken ibuprofen, but it did not reduce her pain. She says that she has not had any back pain or knee pain and has not fallen. She has no fever or vomiting, and no paresthesias. She has a past medical history of hypertension, for which she takes hydrochlorothiazide. She is a nonsmoker.

View the image taken (Figure 1) and consider what your diagnosis would be.
Resolution of the case is described on the next page.