Clinical and radiological evaluation as done on 46 cases of Osgood-Schlatter disease observed at BusanNational University Hospital during about 5 years period dating from Jan. 1970 to May 1975, in respect of age,sex, involving site, relationship with trauma, radiological finding, clinical symptom and method of treatment. Theresult was summerized as follows. 1. The peak age incidence was between 11 and 14 years, that is 20 cases amongtotal 46 cases. 2. The male to female ratio as 4.8:1. 3. Unilateral involvment was more common than bilaterally,that is the unilateral involvment was 31 cases of 46 cases, right 15 cases and left 16 cases respectively. 4.Twenty-two cases of total 46 cases were not related with trauma, and then the trauma seemed to be not definitecause of Osgood-schlatter disease. 5. Radiological findings revealed that the most cases(38 cases ) had one or twoseparated bony fragments. Type II by Woolfrey and Chandler classification was the most frequent type. 6. The mostcommon clinical symptoms were pain and tenderness on the tibial tuberosities(34 cases). 7. The prognosis wasexcellent. Thirty-one cases among total 46 cases were spontaneously healed without any treatment.