Scapular Kinematics Pre and Post Thoracic Thrust Manipulation in Individuals With and Without Shoulder Impingement Symptoms: A Randomized Controlled Study
Haik MN1, Alburquerque-Sendín F, Silva CZ, Siqueira-Junior AL, Ribeiro IL, Camargo PR. J Orthop Sports Phys Ther. 2014 May 22. [Epub ahead of print]
Take Home Message: Patients with shoulder impingement syndrome (SIS) who underwent a thoracic spine manipulation (TSM) had an immediate decrease in symptoms; however, no differences in scapular kinematics were identified.
Shoulder impingement syndrome (SIS) is a common condition associated with abnormal scapular kinematics (i.e., increased scapular internal rotation and decreased upward rotation and posterior tilt). This condition is often treated using rehabilitation exercises and sometimes manual therapy. Specifically, high-velocity low amplitude (thrust) thoracic spine manipulation (TSM) is a manual therapy technique that has been investigated for treating shoulder conditions. However, the contribution and effectiveness of TSM for treatment of SIS has not been well-studied. Therefore, Haik and colleagues conducted a randomized controlled study to assess the immediate effects of TSM on pain and scapular movement during elevation and lowering of the arm in individuals with SIS. Fifty participants with SIS (average age 31.8 years) and 47 asymptomatic participants (average age 25.8 years) were randomized into 2 groups: manipulation or sham treatment. For the sham treatment, a therapist applied all the same forces as done for the thrust-manipulation, but a thrust was not used. Scapular movements were analyzed during elevation and lowering of the arm in the sagittal plane. The authors used pain scores (numeric pain rating scale) to assess shoulder pain during arm movement pre- and post-intervention. For those in the SIS group, shoulder pain was immediately reduced after TSM and sham interventions. Despite no differences in the average pain improvement between the treatment groups more participants had pain relief after TSM (~60%) then after sham intervention (~36%). For some scapular movements, the authors observed subtle differences between pre- and post-intervention; however, the small magnitude of the differences failed to meet a level of clinical importance, defined based on existing research.
The clinical rationale for TSM is related to the concept of regional interdependence proposed by Wainner et al. He suggested that unrelated impairments in an anatomical region may contribute to, or be associated with, the patient’s primary complaints. For example, alterations in the thoracic spine and ribs may contribute to shoulder impingement symptoms. The authors demonstrated that shoulder pain in individuals with SIS is immediately decreased after a TSM, supporting this concept of regional interdependence. However, there was not a clinically-important difference in scapular movements following TSM. This suggests that TSM provides little to no adjustment in biomechanical motion of the scapula. Therefore, the mechanism by which this pain relief is achieved is unclear. It is possible that neurophysiological effects of joint manipulation may alter sensory information (e.g., pain processing, motor control) from the shoulder to the central nervous system. Future studies should work to identify the biologic and mechanical mechanisms by which spinal manipulation techniques decrease pain in participants with SIS. Additionally, the long-term effects of spinal manipulations should also be characterized. Findings from this study raise additional questions in our understanding of manual therapies and highlight the importance of considering regional interdependence when evaluating and treating shoulder conditions. This study suggests that the use of TSM may be a useful technique to manage pain in patients with SIS.
Questions for Discussion: Based on results from this study, would you employ thoracic spinal manipulations to manage pain associated with SIS? Do you think TSM could have long-term benefits in treating SIS?
Written by: Katie Reuther
Reviewed by: Jeffrey Driban
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