October 24, 2011
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Study: Lyme arthritis should be considered in cases of monoarticular pediatric hip pain

Glotzbecker MP. J Ped Ortho. 2011. doi: 10.1097/BPO.0b013e31822f1abc

Although Lyme arthritis most commonly affects the knee, a new study recommends that it should be considered in the differential diagnosis of monoarticular hip pain associated with effusion — at least in areas where Lyme disease is endemic, according to this study from researchers in Boston.

The team selected a Lyme endemic region and reviewed clinical records at a tertiary children’s referral center.

“Primary monoarticular Lyme arthritis of the hip is uncommon,” study authors said. “[…] and differentiating it from septic arthritis or toxic synovitis of the hip may be difficult.”

Records revealed that 8 patients met the Lyme arthritis criteria. All patients — with an average age of 9.5 years (range of 3 years to 20 years) — presented with hip pain or refusal to bear weight. Aspiration was performed on 5 patients. Three of 8 patients were treated surgically; all patients received antibiotics and all were found to be asymptomatic at last follow-up. In all but one case, appropriate antibiotics were not promptly administered.