Concerns About My Child's Mobility
On Thursday, my five-year-old son woke up with significant stiffness in one of his legs, making it difficult for him to walk normally, yet he didn’t express any discomfort—what a resilient little guy! However, by Friday, he was completely unable to walk, not even to the bathroom, and he couldn't even stand. Alarmed, we took him to the doctor where X-rays were conducted, revealing the presence of fluid in two areas of his knee. Although his leg appears slightly swollen, it isn’t excessively so, nor is it red, hot to the touch, or accompanied by a fever. The physician advised us to return if he hasn’t regained the ability to walk by Monday, which we definitely plan to do. In the meantime, we can't help but feel anxious; it doesn’t seem to align with an infection. What could possibly be causing this? Just four weeks ago, we left the hospital after dealing with Epstein-Barr, and now we’re faced with this situation. Are there specific tests we should request to better understand his condition?
Answers (1)

6/29/2025, 5:01:15 PM
OpenHealth AI
I'm sorry to hear about your son's situation; it must be very concerning for you and your family. Given his recent history with Epstein-Barr and the current symptoms of stiffness and inability to walk, it’s understandable that you feel anxious. Let’s break down your concerns and focus on important next steps.
Main Points:
Your son’s symptoms—significant leg stiffness, fluid in the knee, and inability to walk—could be linked to several factors, including inflammation, joint issues, or a possible autoimmune reaction. Your MD's recommendation to monitor for improvements is important, but there are steps you can take in the meantime to better understand his condition.
Explanation:
- Fluid in the knee: This could indicate an inflammatory process, possibly linked to his previous Epstein-Barr infection, or it might be due to a transient condition affecting the joint, such as a form of reactive arthritis.
- Signs of infection: The absence of redness, warmth, or fever makes a bacterial infection less likely, but inflammation can still occur due to other reasons.
- Further considerations: Given his recent medical history, it might be worth exploring if this stiffness and inability to walk are a result of an autoimmune response or another benign condition.
Next Steps:
- Observation: Keep a close watch on his symptoms. Noting any changes, especially regarding mobility and activities of daily living, will be critical when discussing with your physician.
- Rest and positioning: Encourage him to rest and keep his leg elevated when possible. Avoid forcing movement, as it could worsen stiffness.
- Hydration and nutrition: Ensure he stays well-hydrated and eats balanced meals to support his recovery.
- Communication with the doctor: When you return to the doctor, consider discussing:
- The possibility of an autoimmune condition or inflammatory arthritis.
- Additional diagnostic tests such as blood tests for inflammation markers, further imaging, or referral to a pediatric rheumatologist if indicated.
- Stay informed: Research potential conditions linked to his symptoms and previous illness (like post-viral syndromes). This can help facilitate a productive dialogue with his healthcare provider.
Conclusion:
Staying calm and proactive can make a difference during this uncertain time. Continue to monitor his condition closely, and prepare any observations and questions you might have for your next visit. Your attentiveness shows how much you care about his wellbeing, and getting the right answers will help bring you both relief. Please let me know if there's anything else you'd like assistance with.
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