Abstract: Supraspinatus muscle is usually the first and the most common rotator cuff muscle encountered in traumatic and non-traumatic rotator cuff tears, representing more than 95% of rotator cuff injuries. The aim of our study is to assess findings associated with non-traumatic supraspinatus muscle tears using magnetic resonance imaging and its relationship to different demographic factors. Shoulder magnetic resonance imaging were reviewed for a total of 321 patients referred from outpatient clinics aged between 18-80 years to analyze those having non-traumatic tear of the supraspinatus tendon during the period from January 2016 till April 2018. Patients with no tear status of the supraspinatus tendon and those with history of shoulder surgery or trauma have been excluded. A total number of 129 patients have fulfilled our inclusion criteria. There were 60 (46.5%) male and 69 (53.5%) female patients with a mean age of 55.25 (±12.96) and 49.98 (±15.4), respectively. A difference that was not statistically significant (p = 0.107). We found a significant difference (p = 0.002) in the frequency of complete and partial supraspinatus tears where 112 patients (86.8%) have partial supraspinatus involvement compared with 17 patients (13.2%) with complete rupture. Several associated factors with supraspinatus non-traumatic injury have been studied; degenerative changes of the acromioclavicular joint showed most significant association 89.8%, joint effusion 77.5%, abnormal bone marrow signal at the superior facet of the greater tubercle 46.5%, curved type of acromion 44.1% and subacromial-subdeltoid bursitis 53.5%. Three patients with tear status showed osacromiale and one patient had calcific tendinitis. Among other rotator cuff tendons the infraspinatus was the most commonly associated one representing 17.2% and long head biceps tendon was involved in 12.4%. Non-traumatic supraspinatus tear has multiple associations that can be detected using magnetic resonance imaging including osseous and muscular structures. Acromioclavicular joint degenerative changes showed the most significant association. This study provides an overview analysis of structural associations related to non-traumatic supraspinatus injury in our sample cohort. Several structural injuries are associated with non-traumatic supraspinatus tear. Degenerative changes of acromioclavicular joint is the most common structural association. MRI is the modality of choice in assessing supraspinatus and its associated injuries.
Nosaiba Al-Ryalat, AzmyAlhadidy , Fadi Al-Hadidi, Osama Samara, Waleed Mahafza, Saba Jaradat, Samar Taqatqeh, Rula Alqawabah, Mira Al Jabi, Mohannad Alresheidat, Saif Aldeen Al Ryalat and Omar Albtoush, 2019. Associated Findings of Non-Traumatic Supraspinatus Tear an MRI Analysis. Research Journal of Medical Sciences, 13: 96-101.