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Osgood-Schlatter disease is commonly observed in children and adolescents, particularly during periods of rapid growth, such as growth spurts. This condition typically affects those who are active in sports that involve running and jumping, which places stress on the knee joint. During these growth spurts, the body is undergoing significant skeletal changes, and the area where the patellar tendon attaches to the tibia (the tibial tuberosity) can become irritated due to increased activity and tension in the muscles and tendons.

The nature of this disease is linked to the developmental stage of the individual, making it particularly prevalent in youth rather than in adults, newborns, or pregnant women. This age-related aspect highlights the importance of recognizing the physical changes occurring during adolescence, as they put this population at higher risk for such conditions. The symptoms usually include localized pain and swelling around the knee joint, which can be exacerbated by physical activity. Overall, B accurately reflects the primary demographic affected by Osgood-Schlatter disease.