Abstract
Frozen shoulder syndrome (FSS) causes pain and restriction of movement in the shoulder. The aim was to assess changes in shoulder muscle isometric maximal voluntary contraction (MVC) force and active range of motion (AROM) in patients with frozen shoulder syndrome (FSS) after manipulation under general anesthesia (MUA). In total, 18 patients with FSS (9 women and 9 men) with a mean age of 53.6 years (SD, 9.7) participated in this study. MVC force of shoulder flexors, adductors, and internal and external rotators was measured by a handheld dynamometer. AROM in the same directions was measured goniometrically. The patients were screened according to the intensity of pain by day and at night. The data were collected before MUA and 1 and 6 months after MUA. A significant reduction in MVC force and AROM was noted before MUA in the involved extremity as compared with the uninvolved extremity (P<0.05). These parameters for the involved extremity were significantly increased 1 month after MUA (P<0.05). However, 6 months after MUA, MVC force and AROM did not differ significantly compared with the uninvolved extremity (P>0.05), whereas AROM of flexion and external rotation remained significantly reduced (P<0.05). A significant reduction in shoulder pain by day and at night was recorded 1 and 6 months after MUA (P<0.05). In the patients with FSS, the fastest improvement of MVC force and AROM occurred following the first month after MUA. However, 6 months after MUA, shoulder muscle MVC force for the involved extremity did not differ significantly as compared with the uninvolved extremity, whereas the shoulder AROM in flexion and external rotation remained lower.
Highlights
Frozen shoulder syndrome (FSS) usually emerges in the sixth decade of life with the peak age of 56 years, and the condition occurs slightly more often in women than men [1]
In the patients with FSS, the fastest improvement of maximal voluntary contraction (MVC) force and active range of motion (AROM) occurred following the first month after manipulation under general anesthesia (MUA)
Before MUA, the patients with FSS showed a significant reduction in MVC force in shoulder flexion, adduction, and external and internal rotation for the involved extremity as compared with the uninvolved extremity (P
Summary
Frozen shoulder syndrome (FSS) usually emerges in the sixth decade of life with the peak age of 56 years, and the condition occurs slightly more often in women than men [1]. In patients with FSS, pain in the shoulder starts slowly and is felt in the deltoid muscle, one cannot sleep on the affected side, and there is a slight local tenderness [2]. This self-limiting disorder with stages lasting up to 1 to 3 years [3] is characterized by a limitation of both active and passive range of motion (ROM) of the glenohumeral joint that is not primarily due to an underlying condition, such as arthritis, rotator cuff tear, cervical radiculopathy, or peripheral neuropathy [4]. Pain and force of the uninvolved side and in controls were unaltered
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