Surgical excision of the ossicles has been suggested for unresolved sequelae of Osgood-Schlatter disease in adults resistant to conservative measures. A 24-year-old, male semiprofessional soccer player had anterior knee pain during sports activity and climbing stairs that had been treated conservatively for 2 years. On physical examination, there was a permanent tibial tubercle with pain. On radiographic examination, an ununited ossicle was seen beneath the patellar tendon. Arthroscopy was performed through the standard low anterolateral and anteromedial portals close to the patellar tendon. Soft tissue at the retropatellar surface and the inflamed infrapatellar fat pad beneath the patellar tendon were debrided with a motorized shaver. Localization of the ununited ossicle was performed by use of an image intensifier. The ossicle was separated from the surrounding soft tissue with a motorized shaver and removed by use of a grasper. After excision of the ossicle, the inflamed surface of the retropatellar tendon was also debrided. The contouring of the irregular surface of the tibial tubercle was performed by use of a motorized bur. After 6 weeks, the patient returned to sports activities without any restrictions. This study showed that all of the described procedures might be done arthroscopically and sports activity may be allowed earlier.