USMLE-Rx Step 2 Qmax Challenge #21610

Check out today’s Step 2 CK Qmax Question Challenge.

Know the answer? Post it in the comments below! Don’t forget to check back for an update with the correct answer and explanation (we’ll post it in the comments section below).

USMLE-Rx Step 2 Qmax Challenge #21610A 75-year-old man presents to his family physician with a 3-day history of joint pain. The patient has had various “aches and pains” in his joints over the years, but in the past 3 days he has noticed that his first metatarsophalangeal (MTP) joint in his left foot has become very painful. He describes the pain as a dull, constant ache, 7 of 10 in severity. He denies any recent trauma or exposure to infectious agents. The remainder of his musculoskeletal examination is normal, with full range of motion and no focal tenderness in any of his other joints. The first MTP in the left foot is warm, erythematous, and extremely tender to touch. Synovial fluid presents with elevated WBCs and no RBCs, and a Gram stain is negative. Polarized light microscopy is shown in the image below.

Which of the following is the most likely diagnosis?

A. Acute gout
B. Osteoarthritis
C. Rheumatoid arthritis
D. Septic arthritis
E. Systemic lupus erythematosus


Want to know the ‘bottom line?’ Purchase a USMLE-Rx Subscription and get many more features, more questions, and passages from First Aid, including images, references, and other facts relevant to this question.

This practice question is an actual question from the USMLE-Rx Step 2 CK test bank. Get more Step 2 CK study help at


9 thoughts on “USMLE-Rx Step 2 Qmax Challenge #21610”

  1. What’s Taking place i’m new to this, I stumbled upon this I have found It absolutely useful and it has aided me out loads. I am hoping to give a contribution & help other customers like its aided me. Good job.

Comments are closed.

Related Articles