Diagnostic Ultrasound vs MRI
Both are excellent MSK imaging modalities. Ultrasound is dynamic, in-clinic and real-time; MRI gives detailed static images of deep and bony structures. They are complementary — not competing.
At a glance
| Criterion | Diagnostic ultrasound | MRI |
|---|---|---|
| Availability | Same-day, in-clinic | Referral, days–weeks wait |
| Cost | Lower | Higher |
| Dynamic assessment | Yes — imaging in motion | No — static images only |
| Bone/marrow | Limited | Excellent |
| Tendon and superficial soft tissue | Excellent, higher resolution than MRI | Excellent |
| Deep joint (hip, spine) | Limited | Excellent |
| Guides injection at same visit | Yes | No |
| Safety | No radiation, no contraindications | No radiation; contraindicated with certain implants |
When Diagnostic ultrasound is preferred
- Rotator cuff, tendons, ligaments, superficial masses
- Guiding an injection accurately
- You need answers today
When MRI is preferred
- Suspected labral tear, deep joint pathology or bony oedema
- Spinal pathology or nerve compression
- Surgical planning
Bottom line
Start with ultrasound for most MSK complaints. MRI is added when a deep structure needs assessment or surgery is being considered.
Frequently asked questions
Is ultrasound as accurate as MRI for rotator cuff tears?
Yes — meta-analyses show ultrasound and MRI have equivalent sensitivity and specificity for full-thickness rotator cuff tears when performed by an experienced operator.
Related treatments
Not sure which is right for you?
Book a consultation — we'll examine, scan and recommend an evidence-based plan on the day.