Which disease involves pulling on the inferior pole of the patella?

• A. Osgood-Schlatter disease
• B. Larsen-Johansson disease
• C. Patellar tendinopathy
• D. Patellofemoral pain syndrome

Answer: (B)

Larsen-Johansson disease specifically involves the pulling effect on the inferior pole of the patella due to repetitive stress or traction from the patellar tendon. This condition is characterized by inflammation of the inferior pole of the patella, where the patellar tendon attaches. This can occur in young athletes who engage in physical activities that require jumping and running, as the repeated strain on the patellar tendon leads to pain and discomfort at the inferior pole.

The distinction of this disease lies in its association with the growth plate at this region during active development in children and adolescents, making it particularly relevant in sports contexts. In this way, Larsen-Johansson disease is directly related to the overuse and pulling on the patellar attachment point, distinguishing it from other options that involve different mechanisms of injury or areas of the knee.