In a patient with clear, yellowish synovial fluid and a leukocyte count of 250/mm3, what is the most likely condition?

• A. Acute gouty arthritis
• B. Osteoarthritis
• C. Rheumatoid arthritis
• D. Septic arthritis

Answer: (B)

In a patient presenting with clear, yellowish synovial fluid and a leukocyte count of 250/mm³, the findings indicate a non-inflammatory condition. Clear and yellowish synovial fluid typically suggests that there is no significant inflammatory process, which is characterized by turbid or cloudy fluid and higher leukocyte counts.

The leukocyte count of 250/mm³ falls within the range seen in osteoarthritis, which generally has a mild increase in white blood cells (often fewer than 2000/mm³), especially relative to inflammatory conditions where counts would be much higher. In inflammatory arthritis (like rheumatoid arthritis or acute gouty arthritis), the synovial fluid might appear cloudy, and the white blood cell count would typically be significantly elevated, often reaching thousands of cells per microliter, and usually having a predominance of neutrophils in gout or lymphocytes in rheumatoid arthritis.

Septic arthritis would usually present with turbid synovial fluid and a very high leukocyte count, often greater than 50,000/mm³ with a predominance of neutrophils, making it unlikely in this scenario.

Considering these aspects, the clear, yellowish synovial fluid combined with a relatively low leukocyte count is most consistent with oste