The strength of the rotator cuff before and after subacromial injection of lidocaine

Força do manguito rotador em indivíduos com síndrome do impacto comparado ao lado assintomático

“…In both evaluated groups and of both genders, we observed significant reduction of lateral rotation and elevation strength, compared to the asymptomatic shoulders. These findings are consistent with the results found in previous studies that also found greater involvement of lateral rotation 10 and elevation 6,13 strength, since SIS more often affects the supraspinatus, followed by the infraspinatus, 14,15 and these muscles are important during elevation 16 and lateral rotation of the shoulder. 17 Tyler et al 18 observed significant reduction of lateral rotation strength in shoulders with SIS, compared to the control group.…”

“…There are several methods described in literature for evaluation of rotator cuff muscle strength. 6,11,12,18,19 However, to evaluate the lateral and medial rotation strengths, the patient was positioned supine, with the shoulder abducted at 45° and at 30° of horizontal adduction (scapular plane), with the elbow flexed at 90° and neutral rotation. This position is defined by literature as the best for evaluating the strength of the lateral and medial rotators in patients with shoulder impingement syndrome, 10,11 as it is a comfortable position for the patient and there is a better Acta Ortop Bras.…”

“…Patients that suffer from SIS present reduction of lateral rotation and elevation strength, but there are contradictions in literature regarding the reduction of internal rotation strength. 5,6 Since patients with unilateral SIS between 50 and 59 years of age and between 60 and 69 years of age can present around 10% and 20% (respectively) of asymptomatic lesions of the contralateral RC 5 , the evaluation of muscle strength of the shoulder can be an important clinical exam in the early detection of SIS on the asymptomatic side. Together with evaluation of the isometric strength of the rotator cuff, the use of specific questionnaires can help to detect shoulder joint dysfunctions, providing a precise dysfunctional diagnosis and a treatment based on functional alterations.…”

Blind subacromial injection from the anterolateral approach: The ballooning sign

“…11 Similarly, in this group of patients, we could not find any relationship between pain and muscle strength, particularly in the presence of rotator cuff disease. In such cases, other factors should be taken into consideration in causing muscle weakness such as muscle atrophy or rotator cuff tear.…”

“…11 With the subject in an upright position, the muscle strength of supraspinatus is assessed in the empty-can position. The internal and external rotators of the shoulder were assessed at 0 abduction.…”