MRI (coronar T1W/3T) on a 12 year-old boy performed 3.6 years postoperatively after a Salter osteotomy due to Perthe’s disease. The screws are mostly replaced with bone but parts of one of the two screws (arrow) still exhibit a mixed signal, i.e. fat signal. This was the only case were the screws were not completely replaced by bone after > 2 years, and this figure shows the section with the most mixed signal