Lateral epicondylitis. Associations of MR imaging and clinical assessments with treatment options in patients receiving conservative and arthroscopic managements

We assessed the implications of MR imaging with clinical history in lateral epicondylitis management by evaluating imaging and clinical features in patients with lateral epicondylitis treated conservatively or operatively. Sixty patients with lateral epicondylitis treated conservatively (n = 38) or operatively (n = 22) from 2011-2015 were included. MR imaging findings of common extensor tendon (CET), lateral collateral ligament (LCL) complex, muscle oedema, ulnar nerve and elbow joint were reviewed. Clinical data recorded were frequency, duration and intensity of pain, history of trauma and injection therapy, range of motion. MRI-assessed CET and LCL complex abnormalities, muscle oedema, radiocapitellar joint widening, joint effusion/synovitis, pain frequency and intensity differed significantly between the two groups (p <.05) with increased severity in operative group. Persistent pain (OR 12.2, p <.01), CET abnormality on longitudinal plane (OR 7.5, p =.03 for grade 2; OR 22.4, p <.01 for grade 3) and muscle oedema (OR 6.7, p =.03) were major factors associated with operative treatment. Area under the ROC curve of predicted probabilities for combination of these factors was 0.83. MR imaging, combined with clinical assessment, could facilitate appropriate management planning for patients with lateral epicondylitis. (orig.)