TL;DR: At a Glance Growing Pains in the knee: Occur typically at night, affect both legs, and involve no visible swelling or tenderness. Osgood-Schlatter Disease: Triggered by physical activity, focuses on a specific bony point below the kneecap, and often includes a visible, tender bump. Key Distinction: Growing pains usually resolve by morning, whereas Osgood-Schlatter pain persists during or after sports. Action: If your child has a localised "lump" or a limp, a specialist