As a result of this study, in which we investigated the effectiveness of the MWM technique in the treatment of patients with shoulder problems, it was found that the shoulder pain of the patients decreased and their AROM and functionality increased. The main conclusion of this study is that although there is no statistically significant difference between the two groups, the MWM technique applied in addition to conventional physical therapy is more effective in symptoms such as limitation of AROM, pain, and functionality. However, we found that both of the treatments had positive effects on the symptoms of patients.
The normal shoulder stabilizing mechanisms are compromised commonly in altered normal structural alignment of the bony constituents of the shoulder girdle, and rotator cuff muscle weakness. The most common pathology among shoulder problems is rotator cuff lesions and impingement syndrome is the most common among them 21,22. In this study, the most common shoulder problems were 87.8% RCS and 12.2% SIS.
Kinematic studies of patients with impingement, rotator cuff tears, and loss of capsuloligamentous integrity, have demonstrated abnormal or excessive superior and anterior translation of the humeral head in the glenoid fossa 23,24. It would appear that excessive translation of the humeral head along the glenoid results in pain, ROM, and functional impairment. Physiotherapy and rehabilitation are commonly used interventions to improve pain, ROM, and physical disability in patients with shoulder dysfunction 25. Physiotherapy approaches are often first used in the conservative management of patients with musculoskeletal dysfunction of the shoulder (such as stretching, strengthening exercises, and electrotherapeutic modalities, combined with manual techniques). Haik et al. 26 reported that exercise therapy was effective in improving function, pain, and ROM in shoulder dysfunction. By adding mobilizations to the exercises, the reduction of pain can be accelerated in the short term. Mulligan 27 advocated that a single application of MWM is clinically beneficial by improving joint pain and ROM. Previous studies have reported that there is a significant correlation between shoulder ROM and function, in particular, abduction, forward flexion, and rotation (internal and external) are associated with various upper extremity activities 28.
In this study, we evaluated the degrees of flexion, abduction, and IR/ER AROM, which are important in terms of functionality. Many treatment options focus on improving ROM. In physiotherapy applications, the most common exercise and joint mobilization methods are preferred in addition to CT. One of the methods used for joint mobilization, MWM will improve the ROM by correcting the biomechanical defect of the joint 29. A study by Kachingwe et al. 14 applied different methods in the treatment of patients with SIS: therapist-guided exercise (posterior capsular stretching, postural exercises, scapular mobilization, and rotator cuff strengthening) to the first group, glenohumeral mobilization and exercise to the second group, MWM and exercise to the third group, patient education to the fourth group. At the end of the treatment, shoulder ROM increased in the second and third groups, while no change was observed in the other groups. In addition, the increase in the MWM group was more significant than in the glenohumeral mobilization group. In another study, the effect of the MWM technique in patients with adhesive capsulitis was examined. As a result, it was found that the IR ROM increased more in the MWM group compared to CT 15. Romero et al. 30 investigated the effect of MWM on shoulder ROM, functionality, and pain in their study on patients with RCS. They applied traditional physiotherapy (postural training, active exercise) to one group and traditional physiotherapy and MWM to another group. As a result, an increase in shoulder flexion, abduction, IR, and ER joint AROM, a decrease in pain level, and an improvement in functionality were observed, equivalent to many studies in the literature 14,15,30.
When the literature is examined, there are many studies on MWM to increase shoulder joint ROM 13,31,32, and this study also proved that MWM increases shoulder joint motion. Additionally, it is accepted that a minimal clinically important difference (MCID) of 6° to 11° is needed to be certain that true change has occurred with goniometric measurements of the shoulder 33. The increase in ROM angles in both groups at the end of treatment provides convincing evidence that the CT and MWM technique provides clinical advantages. In this results, it was seen that CT had a positive effect on AROM results, but more significant results were obtained when combined with MWM. If MWM alone had been applied, the results might not have improved as much. In addition, we believe that painless, mobilization with activity caused a greater increase in ROM.
Hyperalgesia and related movement disorders associated with shoulder disorders cause functional deficiencies in the daily activities of the patient 32. As an indicator of the severity of the problem, Smith et al. 34 reported that 83% of people with shoulder dysfunction were unable to sleep on the involved side because of pain. Physical therapy encompasses a large range of treatments. There are therapeutic modalities designed to alleviate pain directly (heat/ice, ultrasound, electrotherapy), and stretching and strengthening exercises intended to relieve pain by improving shoulder function 22. In this study, cold/hot application, ROM exercises (Wand exercise, shoulder wheel, etc.), stretching and strengthening exercises, scapular mobilization, and proprioceptive exercises were applied to the patients as CT. Ginn et al. 35 in a study examining the effects of CT (exercise therapy, passive joint mobilization, corticosteroid injection, electrotherapy) in individuals with shoulder pain, they found that there was a decrease in pain intensity and functional improvement in the long term. In the literature, many studies show that the MWM method reduces pain 13,32,36. Menek et al. 13 reported that MWM decreased pain scores at rest and activity more significantly in individuals with RCS compared to the control group. Neelapa et al. 32 applied exercise to one group of patients with shoulder pain and the MWM technique to the other group. They reported that there was a greater decrease in Visual Analog Score (VAS) in the MWM applied group at the end of 3 sessions.
In this study, where we examined the effect of MWM, it was found that activity and night pain decreased more than the control group, and rest pain decreased at a similar rate. Mintken et al. 37 reported that the NPRS showed high test-retest reliability (intraclass correlation coefficient, 0.74) and a MCID of 1.1 points in patients with shoulder pain. Considering this value, in this study, it was found that rest pain decreased by 2 cm in both groups, while activity and night pain decreased by more than 5 cm in the MWM group. The mechanism of action of MWM has been suggested to activate a non-opioid descending pain inhibitory system causing mechanical hypoalgesia. In addition, it is suggested that MWM has mechanical effects, restoring normal biomechanics to the dysfunctional joint, and allowing a greater pain-free ROM 38,39. We believe that the reason for this is that the MWM technique is a mobilization method with the active participation of the patient, thus reducing the pain more easily. In addition, the therapist constantly monitors the patient during the technique to ensure that no pain reoccurs, and if pain begins, the therapist explores different treatment planes and/or degrees of assistive motion to ensure pain-free movement.
When the studies were examined, the problems involving the body structure and functions of the patients (such as pain, strength, and ROM) were evaluated more 15,30,32,35. However, in the daily life activities of individuals, the examination of PSFS is insufficient. In the assessment of the patient, the functional evaluation scales specific to the individual and unique to the region are extremely important in determining the effectiveness of the treatment. In this study, unlike other studies, the PSFS was used to increase the patient's participation, to provide an opportunity to evaluate and score their situations. Kachingwe et al. 14 have examined different treatment methods in SIS. While there was an improvement in functionality in the exercise, mobilization, and MWM group compared to the control group, the percentage change in the MWM group was greater. Satpute etl al. 31 demonstrated that the MWM group applied with exercise showed more functional improvement than the exercise group. Ajit et al. 40 reported that the MWM technique provides a decrease in VAS and Disabilities of the Arm, Shoulder, and Hand (DASH) scores and an increase in acromiohumeral distance in patients with shoulder impingement syndrome. In another study conducted on patients with RCS, it was reported that the MWM technique provided more functional improvement, although it was not statistically significant, compared to the control group 30. In addition, Menek et al. 13 reported that the DASH score decreased more in the MWM group compared to the control group, and there was a functional improvement in both groups. In Menek et al. 13 study, which included a similar treatment to this study, while CT included codman exercises, wand, shoulder wheel, finger ladder, cold pack, TENS, US, and stretching and strengthening exercises, the MWM technique was applied in flexion, abduction, ER, and IR directions. Consistent with other studies 13,14,31,40, functional improvement was found in both the MWM and control groups in this study. In addition, unlike other studies 13,14,31,40, in this study in which PSFS was determined and evaluated, improvement was higher in the MWM group. Although there were similar results between the groups, the MWM technique relieves the shoulder joint and increases the ROM. We think that the increase in functionality combined with the increased ROM will lead to further improvement in the MWM group.
This study has some limitations. First, the patients' most affected shoulder flexion, abduction, and IR/ER AROM angles were examined, but adduction and extension AROM angles were not evaluated. Secondly, our participants were not only a specific group, RCS and SIS patients with shoulder problems were included in the study. Therefore, the absence of patients with different diagnoses affects generalization. There is a need for large-scale studies with different diagnoses that also examine the long-term effects of treatment.