Lyme Arthritis in Children on the Uptick in Western New York Area

OBJECTIVE: This study explores a suspected increasing incidence of Lyme arthritis in the Western New York pediatric population. In addition, we aim to describe a clinical picture of Lyme arthritis and the clinical features that distinguish it from other forms of arthritis. METHODS: Patients diagnosed with Lyme arthritis between January 2014 and September 2018 were identified using International Classification of Diseases—10th Revision (ICD 10) codes for Lyme disease and Lyme arthritis. Patients were included in the study if they (1) exhibited arthritis, (2) tested positive for Lyme antibodies, and (3) exhibited a positive Western blot. RESULTS: A total of 22 patients were included in the study. There was a general trend toward an increasing number of cases of Lyme arthritis over the 45-month observation period. We identified 1 case in each 2014 and 2015, 4 cases in 2016, 7 in 2017, and 9 in the first 9 months of 2018. In total, 17 patients had arthritis as their only symptom at the time of diagnosis and 10 patients had a rash or a history that prompted suspicion of Lyme disease. The knee was the most frequent joint (86.4% of patients), and patients typically had 2 or fewer joints affected (86.4% of patients). CONCLUSIONS: A significant increase (P = .02) in Lyme arthritis cases was observed at Oishei Children’s Hospital of Buffalo. Lyme arthritis may clinically present similarly to other forms of arthritis, such as oligoarticular juvenile idiopathic arthritis, so health care providers should be aware of distinguishing clinical features, which include rapid onset of swelling and patient age. Because the geographic area of endemic Lyme disease is expanding, all health care providers need to be aware of Lyme arthritis as a possible diagnosis.