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Children’s Hospital of Philadelphia Researchers Show How Patellar Instability Affects Knee Development in Growing Youth

Feb 5, 2025

Researchers at Children’s Hospital of Philadelphia (CHOP) demonstrated how trochlear anatomy evolves during pediatric development with and without recurrent patellofemoral instability (PFI), a condition where the kneecap repeatedly slips out of its groove, causing pain, swelling and difficulty with physical activity. The findings, recently reported in a landmark study in the American Journal of Sports Medicine, highlighted that PFI in growing children worsens trochlear dysplasia, which can result in further kneecap instability, while those without PFI experienced natural improvements.

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