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Progressive conscious control of scapular orientation with video feedback has improvement in muscle balance ratio in patients with scapular dyskinesis: a randomized controlled trial |
Huang T-S, Du W-Y, Wang T-G, Tsai Y-S, Yang J-L, Huang C-Y, Lin J-J |
Journal of Shoulder and Elbow Surgery 2018 Aug;27(8):1407-1414 |
clinical trial |
6/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: Yes; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: Yes; Adequate follow-up: No; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed* |
BACKGROUND: Video feedback (VF) can guide patients to consciously control scapular orientation without inappropriate substitution. This study investigated whether progressive conscious control with VF improves scapular muscle activation and movements during arm elevation in patients with subacromial impingement and scapular dyskinesis. METHODS: The study recruited 38 amateur overhead athletes with subacromial impingement and scapular medial border prominence who were randomly assigned to the VF or control group. The participants in both groups controlled the scapular position and progressively practiced from 0 degrees to 45 degrees and from 0 degrees to 90 degrees of arm elevation. Participants in the VF group also controlled the scapular position with a video presentation of the scapula on a screen. We investigated the scapular kinematics, muscle activation, and balance ratio for outcome collection in the preintervention and postintervention conditions with and without VF conditions. RESULTS: Decreased upper trapezius (UT) activation (3% to 13%, p < 0.0083), increased lower trapezius (LT) activation (3% to 17%, p < 0.0083), restored UT/LT ratios (0.67 to 3.13, p < 0.0083), and decreased scapular internal rotation (1.8 degrees to 6.1 degrees, p < 0.003) relative to the preintervention condition were demonstrated in the 2 postintervention conditions in both groups. The VF group also demonstrated decreased UT/serratus anterior ratios (0.21 to 0.30, p < 0.0083) in 2 postintervention conditions relative to the preintervention condition. CONCLUSIONS: The progressive control of scapular orientation with or without VF can be used to reduce the UT/LT ratio and improve scapular internal rotation during arm elevation. Control training with VF can further decrease the UT/serratus anterior ratio. LEVEL OF EVIDENCE: Level II; randomized controlled trial; treatment study.
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