PURPOSE : The trochlear secondary ossification center may be variable in number, shape and size, thus it can be considered as fracture. The purpose of this study is to evaluate radiographic analysis of normal trochlear secondary ossification center. METHOD AND MATERIAL : We reviewed the 100 cases of normal elbow radiographs and classified the numbers and shapes of trochlear sencondary ossification center. RESULT : The number of trochear secondary ossification center was that one was 72 cases(72%), two 19 cases(19%), three 9 cases(9%). The shape of trochlear ossification center which has only one ossification center was classified as round was 11cases(15.3%), elliptical 24 cases(33.3%), irregular37(51.4%). CONCLUSION : The radiographic finding of trochlear secondary ossification center is variable in number, size and shape, thus authors concluded that fragmentation or bizzare shape of trochlea in painless elbow must be considered as secondary ossification center.