Osgood-Schlatter disease is a tibial osteochondritis thought to arise from overuse of the quadriceps muscle during periods of growth. This causes a traction apophysitis at the tibial insertion of the quadriceps tendon. The most common symptom is anterior knee pain that worsens with exercise. A tibial bump may be felt and can often be seen on x-ray. Treatment is usually conservative. Surgical excision is only necessary in severe and treatment-resistant cases.
- Overuse (especially sports involving sprinting and jumping) during the ossification period (adolescence) → excessive strain and repeated avulsion of the patellar ligament on the tibial tuberosity → inflammation → traction apophysitis
- Chronic inflammation of the patella ligament can disrupt the secondary ossification of the tibial tuberosity → detachment of the apophysis → subsequent callous formation during the healing process → pronounced tibial tubercle