MRI (Magnetic Resonance Imaging) is generally preferred over CT (Computed Tomography) for knee evaluations.
Knee Imaging: MRI vs. CT
While both CT and MRI can image the knee, MRI is often considered the "gold standard." This is due to its superior ability to visualize soft tissues. Here's a comparison:
| Feature | CT Scan | MRI Scan |
|---|---|---|
| Soft Tissue | Less detailed | Highly detailed |
| Bone Detail | Good | Good |
| Radiation | Uses ionizing radiation | No ionizing radiation |
| Common Uses | Bone fractures, some joint abnormalities | Ligament injuries, cartilage damage, meniscal tears, tendon issues, patellofemoral morphology |
Why MRI is Often Preferred for Knee Imaging
- Superior Soft Tissue Visualization: MRI excels at imaging ligaments, tendons, cartilage, and muscles, which are crucial structures in the knee.
- Evaluating Patellofemoral Morphology: According to research, "MRI has better reliability in evaluating patellofemoral morphology and is currently the gold standard for knee joint evaluation." This means MRI provides a more accurate assessment of the kneecap's shape and alignment.
- No Ionizing Radiation: MRI does not use radiation, making it a safer option, especially for repeated imaging or for younger patients.
When Might CT Be Used?
CT scans can still be valuable in specific situations:
- Evaluating Complex Fractures: CT scans provide excellent detail of bone structures, making them useful for assessing complex fractures.
- When MRI is Contraindicated: If a patient has a metal implant incompatible with MRI, a CT scan may be the only option.
