Tibial Tubercle Avulsion Fracture in a Case of Pre-existing Osgood-schlatter Disease

Introduction: Osgood-Schlatter's disease (OSD) is a well-known condition; however, a tibial tubercle avulsion fracture following an OSD is rare. We reported a case of tibial tubercle avulsion fracture with pre-existing OSD in a 12-year-old boy. Case Presentation: A 12-year-old boy had right knee pain and could not walk after kicking a ball with his right leg during a soccer game. He had been diagnosed with OSD at another hospital 2 months previously. He was then diagnosed with a right tibial tubercle avulsion fracture. The fragment was thin, and the patient was treated with internal fixation using cannulated cancellous screws. The patient demonstrated near-normal knee function and was allowed to return to sporting activities 6 months postoperatively. Conclusion: In this case, the tibial tubercle avulsion fracture might have been associated with OSD. Care should be taken while treating OCD to prevent tibial tubercle avulsion fractures.