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Thoracic Manual Therapy Improves Pain and Disability in Individuals With Shoulder Impingement Syndrome Compared With Placebo: A Randomized Controlled Trial With 1-Year Follow-up

Published:March 21, 2022DOI:https://doi.org/10.1016/j.apmr.2022.03.003

      Abstract

      Objective

      To investigate whether muscle energy technique (MET) to the thoracic spine decreases the pain and disability associated with shoulder impingement syndrome (SIS).

      Design

      Single-center, 3-arm, randomized controlled trial, single-blind, placebo control with concealed allocation and a 12-month follow-up.

      Setting

      Private osteopathic practice.

      Participants

      Three groups of 25 participants (N=75) 40 years or older with SIS received allocated intervention once a week for 15 minutes, 4 consecutive weeks.

      Interventions

      Participants were randomly allocated to MET to the thoracic spine (MET-only), MET plus soft tissue massage (MET+STM), or placebo.

      Main Outcome Measures

      Primary outcome measure: Disabilities of the Arm, Shoulder, and Hand (DASH) questionnaire. Secondary outcome measures: Shoulder Pain and Disability Index (SPADI) questionnaire; visual analog scale (VAS) (mm/100): current, 7-day average, and 4-week average; Patient-Specific Functional Scale (PSFS); and Global Rating of Change (GROC). Measures recorded at baseline, discharge, 4-week follow-up, 6 months, and 12 months. Also baseline and discharge thoracic posture and range of motion (ROM) measured using an inclinometer. Statistical analysis included mixed-effects linear regression model for DASH, SPADI, VAS, PSFS, GROC, and thoracic posture and ROM.

      Results

      MET-only group demonstrated significantly greater improvement in pain and disability (DASH, SPADI, VAS 7-day average) than placebo at discharge (mean difference, DASH=−8.4; 95% CI, −14.0 to −2.8; SPADI=−14.7; 95% CI, −23.0 to −6.3; VAS=−15.5; 95% CI, −24.5 to −6.5), 6 months (−11.1; 95% CI, −18.6 to −3.7; −14.9; 95% CI, −26.3 to −3.5; −14.1; 95% CI, −26.0 to −2.2), and 12 months (−13.4; 95% CI, −23.9 to−2.9; −19.0; 95% CI, −32.4 to −5.7; −17.3; 95% CI, −30.9 to −3.8). MET+STM group also demonstrated greater improvement in disability but not pain compared with placebo at discharge (DASH=−8.2; 95% CI, −14.0 to −2.3; SPADI=−13.5; 95% CI, −22.3 to −4.8) and 6 months (−9.0; 95% CI, −16.9 to −1.2; −12.4; 95% CI, −24.3 to −0.5). For the PSFS, MET-only group improved compared with placebo at discharge (1.3; 95% CI, 0.1-2.5) and 12 months (1.8; 95% CI, 0.5-3.2); MET+STM at 12 months (1.7; 95% CI, 0.3-3.0). GROC: MET-only group improved compared with placebo at discharge (1.5; 95% CI, 0.9-2.2) and 4 weeks (1.0; 95% CI, 0.1-1.9); MET+STM at discharge (1.2; 95% CI, 0.5-1.9) and 6 months (1.2; 95% CI, 0.1-1.3). There were no differences between MET-only group and MET+STM, and no between-group differences in thoracic posture or ROM.

      Conclusions

      MET of the thoracic spine with or without STM improved the pain and disability in individuals 40 years or older with SIS and may be recommended as a treatment approach for SIS.

      Keywords

      List of abbreviations:

      DASH (Disabilities of the Arm Shoulder and Hand), GROC (Global Rating of Change), HVLA (high-velocity low-amplitude), ICC (intraclass correlation coefficient), MCID (minimal clinically important difference), MET (muscle energy technique), PSFS (Patient-Specific Functional Scale), ROM (range of motion), SIS (shoulder impingement syndrome), SPADI (Shoulder Pain and Disability Index), STM (soft tissue massage), VAS (visual analog scale)
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