A patient presents with complaints of a sharp pain in the po…

A patient presents with complaints of a sharp pain in the posterior knee, swelling of the calf and on physical exam you find the below finding (see photo) on the ankle. There was no known injury to the area. What is the most appropriate diagnosis for this patient?

 A 73 year old patient presents with fatigue, as well as pai…

 A 73 year old patient presents with fatigue, as well as pain, stiffness and some diminished motion in her shoulders and hips. Given your main differential diagnosis at this point, which of the following tests would best assist in initially confirming this diagnosis?