In a method for determination of coronal and sagittal planes for the subsequent acquisition of new magnetic resonance slice images or the representation of magnetic resonance slice images from an existing image data set of a knee joint, starting from a data set representing a transversal slice image of the knee joint, the slice image is analyzed using at least one analysis algorithm to identify the medial and the lateral condyles of the femoral bone head shown as a transversal section and a point lying thereon in a section that defines a coronal plane that is tangential to the condyles. The sagittal plane proceeding perpendicular to the defined coronal plane is then determined. Coronal or sagittal slice images are then acquired or represented with orientations dependent on the identified planes.