IS BASELINE STRAIN INDEX A PROGNOSTIC FACTOR FOR SMALL UNILATERAL SUPRASPINATUS TENDON TEARS? A PROSPECTIVE STUDY

Purpose: From prospectively report the 2-year follow-up clinical and real-time sonoelastography (RTSE) outcomes of a group of patients affected by small unilateral supraspinatus tendon tears. Our hypothesis was that patients with lower baseline strain indexes would have worst outcomes at follow-up. Methods: We recruited patients suffering by a unilateral rotator cuff tear. All patients have prospectively scrutinized. Patients were initially managed non-operatively, after at least 3 months of failed conservative treatment patients went under surgery. Our clinical evaluation and follow up was done by: complete physical examination; VAS for pain; Quick DASH; Constant–Murley score; Simple Shoulder Test; ASES score and UCLA score. The mechanical properties of tissues were evalutated by Conventional ultrasounds and RTSE and they were estimated uging the Strain index. Results: Forty-three patients were available for evaluation at 2 years. Fifteen had undergone surgery (operative group), while 28 recovered from pain and dysfunction with conservative management andhad not required surgery (non-operative group). Patients in both groups significantly improved at follow-up, and no differences were found in all considered clinical outcomes. The biomechanical properties of repaired tendons were maintained, while non-operatively treated tendons softened over time. Baseline and follow-up strain indexes were linearly correlated with clinical outcomes at 2 years. Conclusions: Baselinestrain index could be associated with post-operative functional outcomes at 2-year follow-up. The biomechanical properties of surgically repaired tendons were maintained, while non-operatively treated tendons softened over time. At least in this cohort of patients, baseline strain index did not suggest who could be managed conservatively and who will need surgery.