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The radiograph of trochleae of these two cases showed irregularity and granular appearance. In our case, heterogeneous signal changed and irregularities were accompanied by hypointensive changes on T1-weighted images. Also, hyperintensive changes on proton density sequences were detected. Radiological evaluation plays an important role in the diagnosis and evaluation of response to treatment in avascular necrosis of the humeral trochlea. Avascular necrosis should be one of the differential lesions involving the trochle