Safety and Efficacy of Urtica Dioica Cataplasm in the Management of Osgood-Schlatter Disease in Young Athletes

Participants will receive a warm Urtica dioica cataplasm applied topically on the affected knee, once daily for 60 minutes, three times per week (on alternate days) over a 6-week period.

Participants will receive a placebo cataplasm, matched in texture, color, and odor to the active treatment. The placebo is inert and safe for pediatric topical use.

Participants will receive oral vitamin D.

Reduction in physical activity based on orthopedic advice.