This clinical trial studies the use of 7-Tesla (7T)and 3T magnetic resonance imaging (MRI) in detecting osteoarthrosis. 7T MRI has increased detection sensitivity, including more accurate lesion delineation, higher inter-rater agreement. Diagnostic procedures such as 7T MRI may help ultimately improved diagnostic and therapies confidence to inform decision making than standard 3T MRI.

7T MRI increased detection sensitivity, attain superior anatomic resolution, higher spatial and spectral specificity of advanced quantitative techniques, and shorter scan times than 3T MRI. When applied clinically, these benefits translate to increased detection sensitivity, and ultimately improved diagnostic and therapies confidence to inform decision making. This study aim to detect the image characteristics and diagnostic accuracy of osteoarthrosis on 7T MRI.

Inclusion Criteria:

• Age≥18 and ≤80
• Having no contraindications against MRI
• Clinically stable

Exclusion Criteria:

• Age#18 or #80
• Pregnancy and other contraindication to MRI scan
• Informed consent not obtained

patients with clinical diagnosis of patellar chondromalacia were continuously included.