Final answer:
MRI has replaced the need for post arthrogram images in many cases. Therefore, the correct option is 3.
Step-by-step explanation:
MRIs (Magnetic Resonance Imaging) have frequently taken the place of post-arthrogram pictures. Ionising radiation is not used during MRI scans to get finely detailed images of joints and soft tissues.
An MRI that follows an arthrogram that uses contrast material to improve visibility of joint structures can produce dynamic pictures that highlight soft tissue structures and identify problems. This modality is very useful for assessing musculoskeletal problems since it provides good spatial resolution.
While nuclear medicine, CT, and sonography are also useful for imaging joints, MRI is the preferred method due to its superior soft tissue contrast and non-invasiveness, which eliminates the need for extra post-arthrogram imaging in many clinical circumstances.
Therefore, the correct option is 3.