Background: Research is supporting thoracic spine manipulation (TSM) as an intervention in treating adhesive capsulitis (AC) when coupled with physical therapy interventions.
Purpose: To investigate whether TSM improves AC outcomes when combined with physical therapy interventions.
Method: A double-blinded, randomized, controlled trial with 40 patients assigned into two groups. The experimental group (EG) received physical therapy intervention and TSM; the control group (CG) had physical therapy with sham manipulation. Both groups received interventions biweekly for 12 weeks. Outcomes included Visual Analogue Scale (VAS), Shoulder Pain and Disability Index (SPADI), scapular upward rotation, and shoulder passive range of motion conducted at baseline, after 1 session, 6 and 12 weeks.
Results: Both groups improved significantly after 6 and 12 weeks in pain, disability (p = 0.01 for both; d = 1.53 and 1.46, respectively), scapular upward rotation, shoulder flexion (p = 0.02 for both; d = 2.2 and 0.92, respectively), abduction (p = 0.04; d = 0.07), and external rotation (p = 0.03; d = 0.7). However, CG showed no significant improvement in pain or disability after one session (p = 0.14 and p = 0.16, respectively; d = 0.46 for both). Between groups, results favored EG significantly in pain, disability, scapular upward rotation, shoulder flexion, and abduction (p = 0.02, p = 0.01, p = 0.02, p = 0.05, and p = 0.04, respectively) at 6 weeks (d = 0.81, d = 0.87, d = 0.67, d = 0.64, and d = 0.69, respectively).
Conclusion: The results suggest that adding TSM yielded superior clinical benefits when compared to physical therapy interventions in AC patients. Nevertheless, it is imperative to acknowledge a specific limitation in our study is the omission of passive internal rotation assessment. This aspect represents a notable constraint in our research.
Clinical trial registry number: Pan African clinical trial registry "PACTR202303495421928".
Keywords: Frozen shoulder; interventional therapy; manual therapy; rehabilitation; shoulder pain.