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Background and Aim: Osgood- Schlatter disease occurs predominantly in adolescent boys involved in active sports. Avulsion of tibial tuberosity with Osgood-Schlatter disease is rare but can occur in adolescence or younger.
Case Report: We describe the case of spontaneous avulsion of tibial tuberosity in a 49-year-old healthy male patient with no prior symptoms of this disease. After simple excision of the ossicle and uneventful postoperative care with partial weight bearing of 20 kg using two crutches for 4 weeks the patient had no more complaints at his final follow-up after 6 years.
Conclusion: To our knowledge the reported case is the first one of spontaneous avulsion of the tibial tubercle following OSD in an adult. Simple excision of the fragment led to an excellent result and can be recommended.