Toxic Synovitis :: Scary Name, Scary Symptoms, Common Condition

Posted by Guest Writer

Published December 21, 2015

Updated March 18, 2025

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doctor checking child's foot and leg in medical clinic (toxic synovitis)
iStock Photo

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doctor checking child's foot and leg in medical clinic (toxic synovitis)
iStock Photo

For (new) moms like me who aren’t aware of every single diagnosis or disease out there, let me save you the shock, worry, and uncertainty of toxic synovitis. The name alone is scary for sure — and the symptoms can be as well. With all the uncertainties that come with motherhood, now this? Yes.

My identical twin boys, Conor and Caden, are a little over 1 year old. One morning, like every other morning, we woke up, got dressed for the day, ate breakfast, dropped the boys off at daycare, and ventured to work.

But I received a call from daycare a few hours later: “Caden isn’t walking anymore. He won’t put any pressure or weight on his right leg.” My heart sank. I didn’t know what could have happened. I thought through every detail of the last few days. What did he have to eat? Did he fall? Was he exposed to something new? Was he stung by a bee? It was strange and more than a little concerning — the possible reasons for his behavior seemed too scary to fathom.

I immediately left work and quickly made my way to daycare. I examined him from head to toe — I looked at his feet, legs, knees, hips, you name it. I then rotated his feet, ankles, toes, and legs to see if he would wince in pain. He didn’t. When he was lying down, he was actually smiling and happy. The only difference was that when he tried to take a step, he couldn’t. I tried to stay as calm as possible. I brought him home, called the doctor, and booked the first available sick appointment. What was going on with my child?!

Toxic synovitis.

That was his diagnosis. Naturally, I texted friends and family and asked if they were familiar with toxic synovitis. No one had heard of it before. So I Googled it and found this excerpt and list of symptoms from the Kids Health website:

“Toxic synovitis has a scary name, but it’s not a scary condition. This temporary inflammation of the hip can cause limping and pain in the hip and leg. This can be unpleasant for a child and unsettling for a parent — especially when symptoms start suddenly — but toxic synovitis usually goes away within a week or two, and causes no long-term problems.”

When kids have toxic synovitis, the pain starts suddenly and is usually on one side of the body. Other signs to look for include:

  • a recent viral infection, such as a cold or stomach virus
  • low-grade fever (up to 101°F [38°C])
  • limping with toes turned outward, the knee bent or straightened
  • walking on tiptoes
  • hip discomfort that happens after a long period of resting the joint (such as sitting in a car or at a desk, or watching TV)
  • knee or thigh pain with no hip pain
  • in younger children, crying
  • in some cases, a refusal to walk

To substantiate those signs and symptoms, particularly related to Caden’s specific situation, he had a head cold/runny nose the days prior to the incident. And he had woken in the night (which I assumed was part of his head cold) a few times that week. For me, a full-time working mom with two 1-year-olds, it was pretty easy to overlook those minor symptoms that happened frequently.

But, as it turns out, Caden had a pretty serious reaction to that specific virus — which put mommy in panic mode!

So FYI to all you moms out there — toxic synovitis is actually pretty common! If your child is experiencing these symptoms after having a virus, bring him or her to the doctor and ask about toxic synovitis.

Oh, and later that evening, Caden was back to normal. Thank goodness!


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My name is Sharon — but everyone calls her Shaz. She has identical twin boys, Conor and Caden, who were born in May 2014 in Washington, D.C. She married her high school sweetheart, Jimbo. She is so thrilled to be back home in Massachusetts to enjoy time with family!

 

Guest Writer

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