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The Limping Child

The Limping Child

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 Limping is a common complaint in pediatric emergency care, but the differential is broad and the stakes are high. In this episode, we walk through a detailed, age-based approach to the evaluation of the limping child. You’ll learn how to integrate the Kocher criteria, when imaging and labs are truly necessary, and how to avoid being misled by small joint effusions on ultrasound. We also highlight critical mimics like appendicitis, testicular torsion, and malignancy—and remind you why watching a child walk is one of the most valuable parts of the exam. Whether it’s transient synovitis, septic arthritis, or something much more concerning, this episode gives you the tools to manage pediatric limps with confidence. Learning Objectives Apply an age-based approach to the differential diagnosis of limping in children.Demonstrate diagnostic reasoning by integrating history, physical exam, imaging, and lab findings to prioritize urgent conditions like septic arthritis and SCFE.Appropriately select and interpret imaging and lab studies, including understanding the utility and limitations of ultrasound, MRI, and the Kocher criteria. Connect with Brad Sobolewski Mastodon: @bradsobo@med-mastodon.com PEMBlog: PEMBlog.com Blue Sky: @bradsobo X (Twitter): @PEMTweets Instagram: Brad Sobolewski References Kocher MS, Zurakowski D, Kasser JR. Differentiating between septic arthritis and transient synovitis of the hip in children: an evidence-based clinical prediction algorithm. J Bone Joint Surg Am. 1999;81(12):1662-70. doi:10.2106/00004623-199912000-00002UpToDate. Evaluation of limp in children. Accessed September 2025.UpToDate. Differential diagnosis of limp in children. Accessed September 2025.StatPearls. Antalgic Gait in Children. NCBI Bookshelf. Accessed September 2025.Pediatric Emergency Care. “Approach to Pediatric Limp.” Pediatrics in Review. 2024. Transcript Note: This transcript was partially completed with the use of the Descript AI and the Chat GPT 5 AI Welcome to PEM Currents, the Pediatric Emergency Medicine podcast. As always, I’m your host, Brad Sobolewski, and in this episode we’re gonna tackle the evaluation of a child presenting with limp. We’ll cover, age-based differential diagnosis. How to take a high yield history and do a detailed physical exam, imaging strategies, lab tests, and when to worry about systemic causes. We’ll also talk about the Kocher criteria for septic arthritis and how to use and not misuse ultrasound when you’re worried about a hip effusion. After listening to this episode, I hope you will all be able to apply an age based. Approach to the differential diagnosis of limp in children. Demonstrate diagnostic reasoning by integrating history, physical exam, imaging, and lab findings to prioritize urgent conditions like septic, arthritis, and scfe, and appropriately select and interpret imaging and lab studies, including understanding the utility and limitations of ultrasound MRI and the Kocher criteria. So let me start out by saying that a limp isn’t a diagnosis, it’s a symptom. It can result from pain, weakness, neurologic issues, or mechanical disruption. So think of limping as the pediatric equivalent of chest pain. In adults. It’s common, it’s broad, and it’s sometimes could be serious. And the key to a good workup is a thought. Age-based approached and kids under three think trauma and congenital conditions between three and 10 transient synovitis range Supreme and over 10 think SCFE and systemic disease. And your differential diagnosis always starts with history. So you gotta ask the family, when did the lymph start? Was it sudden or gradual? Is there a preceding viral illness or an injury? Is the limp worse in the morning? Does it get better with activity? Do the kid complain of pain or are they just favoring one leg? And then are there any systemic symptoms such as fever, rash, weight loss, fatigue, or joint swelling elsewhere? And you wanna find out whether or not the kid is actually bearing any weight at all. Have they had recent travel or known tick exposure? Are they potty trained and are they having accidents now? Have they had any prior episodes of joint swelling or limping like this in the past? And don’t forget a developmental history, especially in kids under preschool age. Most children begin to stand at nine to 12 months. Cruise at 10 to 12 months and walk independently by 12 to 15 months. A child who has never walked normally may have a neuromuscular or congenital problem. When you are evaluating limp, obviously you wanna watch the kid walk, get them outta the exam room if needed. First of all, your exam room is small. Kid may feel confined and they might be more willing to take some steps. If you have ’em out in the hallway, obviously have the caregiver nearby and a toy, a phone, some object of enticement. You wanna watch their stance phase, or they just avoiding bearing weight on one limb. When they’re standing the swing ...
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