Abstract: In order to analyze the diagnostic value of MRI-related quantitative parameters for SIS and the relationship with shoulder joint function and treatment effect, 56 SIS patients in our hospital were set as the SIS group, and 56 healthy subjects in the same period were set as the control group. The general data and the shoulder joint function score (Constant) were compared between the two groups, as well as the level of MRI quantitative parameters. And the relationship between the MRI quantitative parameters and the Constant score, the incidence of SIS, the treatment effect and the diagnostic value of SIS in patients of SIS were discussed. The results showed that the Constant score and the shortest shoulder-brachial distance of the SIS group were lower than those of the control group. And the acromion index and the height of acromioclavicular joint osteophytes were higher than those of the control group. Moreover, the acromion index and the height of acromioclavicular joint osteophytes of the effective patients in the SIS group were lower than those in the ineffective patients. And the shortest shoulder-brachial distance was higher than that in the ineffective patients (P<0.05). All MRI quantitative parameters were important factors influencing the onset of SIS (P<0.05). The specificity of the combined diagnosis of SIS by the MRI quantitative parameters was 87.50%, and the sensitivity was 80.36%. The results show that MRI quantitative parameters are of high value in the diagnosis of SIS, and are related to shoulder joint function and treatment effects.

Key words: MRI quantitative parameters, subacromial impingement syndrome, shoulder joint function