Value of MRI in the diagnosis of shoulder injury

Objective To explore the value of MRI in the diagnosis of shoulder joint injury. Methods Fifteen patients with shoulder joint injury confirmed by shoulder arthroscopy admitted to Shenzhen Hospital of Hong Kong University from January 2015 to December 2018 were selected, the clinical data of preoperative routine MRI and Mr shoulder arthrography (MRA) were analyzed retrospectively. Results Arthroscopic results showed that in 15 patients with shoulder joint injury, there were 2 full-thickness rotator cuff tears, 10 partial rotator cuff tears and 3 glenoid lip injuries. The results of MRA were 2 cases, 10 cases and 3 cases, which were consistent with arthroscopic results. Routine MRI diagnosis results: 1 case of rotator cuff full-thickness tear (correct diagnosis rate was 93.3%, missed diagnosis rate was 50.0%, misdiagnosis rate was 0), 12 cases of rotator cuff partial tear (correct diagnosis rate was 86.7%, missed diagnosis rate was 0, misdiagnosis rate was 40.0%), 2 cases of rotator cuff tear complicated with glenoid lip injury (positive diagnosis rate was 93.3%, missed diagnosis rate 33.3%, misdiagnosis rate was 0), of which 2 cases were misdiagnosed as rotator cuff partial tear MRA and arthroscopy showed 1 case of full-thickness rotator cuff tear and 1 case of glenoid lip injury caused by rotator cuff tear. Conclusions Compared with conventional MRI, MR arthrography can improve the diagnosis accuracy of shoulder joint injury and has clinical application value. Key words: Shoulder arthrography; Magnetic resonance imaging; Glenoid lip; Rotator cuff; Injury