Applying Transformation matrix to DICOM files?

I am trying to alter the patient orientation of DICOM files from one data set, to the patient orientation of another data set. My attempt below changes the values of the original image orientation, but does not apply it to the original DICOMs. I need to apply the intended image orientation to the entire folder of the original DICOMs.

knee_original = 'C:\Users\Desktop\FolderContainingDICOMsIncorrectOrientation\0001.DCM';

knee_original_info = dicominfo(knee_original);

knee_original_info.ImageOrientationPatient

knee_intended = 'C:\Users\Desktop\FolderContainingDICOMsCorrectOrientation\0001.DCM';

knee_intended_info = dicominfo(knee_intended);

knee_intended_info.ImageOrientationPatient

knee_original_info.ImageOrientationPatient = knee_intended_info.ImageOrientationPatient