Corticosteroid injection alone vs additional physiotherapy treatment in early stage frozen shoulders

AIM: To investigate the additional value of physiotherapy after a corticosteroid injection in stage one or two idiopathic frozen shoulders (FSs). METHODS: A two center, randomized controlled trial was done. Patients with a painful early stage idiopathic FS were eligible for inclusion. After written consent, patients were randomly allocated into two groups. All patients received an ultrasound-guided intra-articular corticosteroid injection. One group underwent additional physiotherapy treatment (PT) and the other group did not (non-PT). The primary outcome measure was the Shoulder Pain and Disability Index (SPADI). Secondary outcomes were pain (numeric pain rating scale), range of motion (ROM), quality of life (RAND-36 score), and patient satisfaction. Follow-up was scheduled after 6, 12 and 26 wk. RESULTS: Twenty-one patients were included, 11 patients in the non-PT and ten in the PT group, with a mean age of 52 years. Both treatment groups showed a significant improvement at 26 wk for SPADI score (non-PT: P = 0.05, PT: P = 0.03). At the 6 wk follow-up, median SPADI score was significant decreased in the PT group (14 IQR: 6-38) vs the non-PT group (63 IQR: 45-76) (P = 0.01). Pain decreased significantly in both groups but no differences were observed between both treatment groups at any time point, except for night pain at 6 wk in favor of the PT group (P = 0.02). Significant differences in all three ROM directions were observed after 6 wk in favor of the PT group (P ≤ 0.02 for all directions). A significantly greater improvement in abduction (P = 0.03) and external rotation (P = 0.04) was also present in favor of the PT group after 12 wk. RAND-36 scores showed no significant differences in health-related quality of life at all follow-up moments. At 26 wk, both groups did not differ significantly with respect to any of the outcome parameters. No complications were reported in both groups. CONCLUSION: Additional physiotherapy after corticosteroid injection improves ROM and functional limitations in early-stage FSs up to the first three months.