Clinical and radiological evaluation was done on 46 cases of Osgood-Schlatter disease observed at Busan National University Hospital during about 5 years period dating from January 1970 to May 1975, in respect of age, sex, involving site, relationship with trauma, radiological finding, clinical symptom and method of treatment. The result was summerized as follows. 1. The peak age incidence was between 11 and 14 years, that is 20 cases among total 46 cases. 2. The male to female ratio was 4.8 : 1. 3. Unilateral invlvement was more common than bilaterally, that is the unilateral involvement 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 definite cause of Osgood-Schlatter disease. 5. Radiological findings revealed that the most cases(38 cases) had one or two separated bony fragments. Type II by Woolfrey and Chandler classification was the most frequent type. 6. The most common clinical symptoms were pain and tenderness on the tibial tuberosities(34 cases). 7. The prognosis was excellent. Thirty-one cases among total 46 cases were spontaneously healed without any treatment.