Objective Analysis on outside humerus condyle inflammation of the clinical value of MRI imaging manifestations and diagnosis and treatment. Methods Choose the hospital clinical diagnosed on the outside of the humerus condyle inflammation in patients with 46 cases (48 elbow) as the research object, on the coronal and transverse and sagittal T1 and T2 FSE series series of FS FRFSE scanning, analysis on the humerus outside the MRI imaging performance of condyle infection and total extensor tendon and lateral radial ulnar collateral ligament damage degree of correlation. Results Carried out in accordance with the total extensor tendon damage degree classification, mild damage to 20 cases, 14 cases of moderate damage, severe injury of 14 cases, MRI outside epicondyle of the humerus and extensor tendon always between the shape slightly high signal; 44 cases of merger called lateral ulnar collateral ligament injury, according to the radial side of the ulnar collateral ligament injury classification, mild damage of 18 cases, 12 cases were moderate damage, severe injury of 14 cases, MRI image visible coronary a T2WI called lateral ulnar collateral ligament disruption, visible water high signal; 16 patients merge called lateral collateral ligament injury, MRI image visible coronal T2WI fat like, called lateral collateral ligament disruption, cross ligament water high signal; Total extensor tendon damage degree and radial lateral ulnar collateral ligament damage degree were positively correlated (rs＞0) the relationship between. Conclusion Outside on the humerus condyle inflammation of the extensor tendon injury always accompanied by a variety of other damage at the same time, the total extensor tendon damage degree aggravating, called lateral ulnar collateral ligament damage degree will also increase.