“`html
Can Lyme Disease Arthritis Appear Years Later? Child Case Report
Lyme arthritis may appear long after a tick bite
A child developed severe knee swelling years after exposure
History and testing helped establish the diagnosis
Can Lyme disease arthritis appear years later? Yes. Lyme arthritis is a late manifestation of Lyme disease that typically develops months after an untreated infection but, in some patients, may not become clinically apparent until much later. This child developed knee swelling years after reported tick bites, illustrating why a careful exposure history remains important.
In their article, “Ten-year-old Omani Girl with Lyme Arthritis,” Mughaizwi and colleagues describe a child who had lived in the United States for 5 years before moving to Oman.1 One year after returning to Oman, she developed symptoms of Lyme arthritis.
“We report a 10-year-old girl who presented with acute arthritis of the left knee, which was confirmed as Lyme arthritis by serology and molecular assay,” the authors wrote.
Tick bites occurred years before the knee swelling
The patient had lived in upstate New York for several years and recalled 2 tick bites. The bites reportedly occurred approximately 2 to 3 years before she developed Lyme arthritis.
One year after returning to Oman, the child began experiencing pain and swelling in her left knee. The symptoms worsened over the course of a week. She reportedly had no other physical complaints or pain in other joints.
“Our patient gave a history of tick bites at least a year prior to her current presentation.”
An examination “revealed marked left knee swelling, mildly tender and warm to touch, extending 2 cm above and below the knee joint,” the authors wrote. “There was mild erythema at the superolateral aspect of the joint.”
Marked swelling involving a large joint, particularly the knee, is a recognized presentation of Lyme arthritis in children. However, other causes of an acutely swollen knee must also be considered. The absence of an earlier rash or flu-like illness can contribute to a missed or delayed Lyme disease diagnosis.
Lyme arthritis was initially mistaken for septic arthritis
An MRI showed a “large knee joint effusion with diffuse thickening of the synovium.” The patient underwent aspiration of the knee joint, which quickly improved her mobility.
The child was initially treated for septic arthritis but was eventually diagnosed with Lyme arthritis after clinicians considered her tick bites and previous residence in an endemic region.
Testing was positive for Lyme disease by ELISA and PCR. “Polymerase chain reaction (PCR) identified Borrelia burgdorferi in the joint fluid,” the authors wrote.
The authors reported that the girl made a complete recovery after 4 weeks of treatment with intravenous cefuroxime.
What can Lyme arthritis years later look like?
- Lyme arthritis may occur without recognized early symptoms. This child did not recall an erythema migrans rash or other manifestations of early Lyme disease before developing arthritis.
- Joint swelling may appear long after a tick bite. The reported bites occurred approximately 2 to 3 years before the child developed knee swelling.
- Geographic exposure remains important after a patient moves. A thorough history should include previous residence in or travel to areas where Lyme disease is endemic.
- Lyme arthritis can resemble septic arthritis. Both conditions may cause an acutely swollen, warm, and painful joint and require careful evaluation.
The authors emphasized that the patient had lived in the United States for 5 years and developed symptoms about a year after returning to Oman. Her previous exposure in upstate New York became an important clue to the diagnosis.
This case also highlights the importance of considering Lyme disease in children with unexplained joint swelling, even when they currently live outside an endemic region. A broader discussion of pediatric presentations is available in the pediatric Lyme disease guide.
How do you distinguish Lyme arthritis from septic arthritis?
Lyme arthritis and septic arthritis can both present with a swollen, warm, and painful knee. Septic arthritis is a medical emergency because bacterial infection within the joint can cause rapid damage and systemic illness.
Children with septic arthritis may be more likely to appear acutely ill, have fever, experience severe pain, or refuse to move or bear weight on the affected limb. However, symptoms and laboratory findings can overlap, and no single clinical feature can reliably distinguish the two conditions in every patient.
Joint aspiration, bacterial culture, Lyme serologic testing, inflammatory markers, imaging, exposure history, and the overall clinical presentation can help distinguish Lyme arthritis from septic arthritis.
PCR testing of synovial fluid may sometimes support a diagnosis of Lyme arthritis, but it is not used by itself to determine whether an infection remains active.
Clinicians must promptly evaluate septic arthritis while also considering Lyme disease in children who have compatible symptoms and current or previous exposure to an endemic region.
Frequently Asked Questions
Can Lyme disease arthritis appear years after a tick bite?
Yes. Lyme arthritis is a late manifestation of Lyme disease and may develop months after an untreated infection. In this case report, the child recalled tick bites that occurred approximately 2 to 3 years before she developed knee swelling.
How long after a tick bite can Lyme arthritis develop?
Lyme arthritis usually develops months after infection, but delayed presentations have been reported. This case illustrates why clinicians should consider previous Lyme disease exposure even when a tick bite occurred years earlier.
What are the symptoms of Lyme arthritis in children?
Lyme arthritis most often causes noticeable swelling in one or a few large joints, particularly the knee. The joint may also be warm, stiff, mildly painful, or difficult to move. Some children otherwise appear well despite substantial swelling.
Can Lyme arthritis be mistaken for septic arthritis?
Yes. Both conditions can cause acute swelling, warmth, pain, and reduced movement of a joint. Septic arthritis requires urgent evaluation, so clinicians may initially treat for a bacterial joint infection while diagnostic testing is underway.
Can Lyme arthritis occur without an earlier rash?
Yes. Some patients with Lyme arthritis do not recall an erythema migrans rash, flu-like illness, or other early symptoms. Arthritis may be the first manifestation that leads to a Lyme disease diagnosis.
Does moving away from a Lyme-endemic area eliminate the possibility of Lyme arthritis?
No. Symptoms of late Lyme disease may appear after a person has moved away from the location where the infection was acquired. Previous residence and travel history can therefore remain clinically important.
Clinical Takeaway
This case illustrates why clinicians evaluating an acutely swollen knee should ask about previous tick bites, travel, and residence in Lyme-endemic regions—even when the exposure occurred long before the current illness.
Lyme arthritis may be the first recognized manifestation of Lyme disease, particularly when an earlier rash or other symptoms were absent or unnoticed.
A careful exposure history can help identify Lyme arthritis years after the suspected tick bite and distinguish it from other causes of joint swelling.
Related Articles
Diagnosing Lyme arthritis of the hip in children
Lyme arthritis in children can present throughout the year
Will steroid injections help children with Lyme arthritis of the knee?
References
- Al Mughaizwi T, Al Rawahi H, Elamin N, Al Hinai Z, Al Muharrmi Z, Al Yazidi LS. Ten-year-old Omani girl with Lyme arthritis. Oman Med J. 2022;37(6):e446.
“`
Dr. Daniel Cameron, MD, MPH
Lyme disease clinician with over 30 years of experience and past president of ILADS.
Symptoms • Testing • Coinfections • Recovery • Pediatric • Prevention
I had these symptoms back in early 70s here in Canada. I was diagnosed with Juvenile Arthritis and nothing was done, not even aspirating or antibiotics. Additionally, I had severe leg and hip pain plus other symptoms. Lyme disease was not even a thing recognized here in the 70s. I was not diagnosed with this until 2017, because I advocated for myself. Thanks to advocacy groups, ILADs, LLMDs, researchers, the internet and social media for putting this out there, so we have a fighting chance. Parents and children today hopefully have a better chance at recovery, because of the aforementioned resources.
Your story is all too common.