Comparison of a fast 5-min knee MRI protocol with a standard knee MRI protocol: a multi-institutional multi-reader...

Area of Science:

• Radiology
• Medical Imaging
• Orthopedics

Background:

• Knee MRI is crucial for diagnosing internal derangements.
• Standard MRI protocols can be time-consuming.
• Faster MRI techniques are needed to improve patient throughput and comfort.

Purpose of the Study:

• To compare the diagnostic performance of a 5-minute knee MRI protocol against a standard knee MRI protocol.
• To assess the interchangeability and accuracy of a fast MRI technique for knee joint evaluation.

Main Methods:

• Retrospective review of 150 knee MRIs (100 at 3T, 50 at 1.5T) using both fast (5-min) and standard multiplanar fast-spin-echo (FSE) sequences.
• Four musculoskeletal radiologists evaluated meniscal, ligamentous, chondral, and bone pathology.
• Interprotocol and intraprotocol agreement, frequency of findings, sensitivity, and specificity were compared.

Main Results:

• Interprotocol agreement for the fast MRI was similar to intraprotocol agreement for the standard MRI (83.0-99.5%).
• No significant differences in the frequency of major findings were observed, except for ACL tears (higher on fast MRI) and cartilage defects (higher on standard MRI).
• Sensitivities and specificities were comparable for meniscal and ligament tears; fast MRI showed slightly lower sensitivity but higher specificity for cartilage defects.

Conclusions:

• A fast 5-minute knee MRI protocol is interchangeable with standard MRI protocols.
• The fast protocol demonstrates similar diagnostic accuracy to standard MRI for evaluating internal derangement of the knee.
• This rapid MRI approach can effectively replace standard protocols, enhancing efficiency without compromising diagnostic performance.