Working Alliance Inventory (WAI) and its relationship to patient-reported outcomes in painful musculoskeletal conditions.

Patients who rated the TA higher were more likely to meet the MCID for region-specific disability and pain intensity. Patient ratings of the TA were associated with improved change scores on pain rating and standardized outcome measures during a course of treatment for musculoskeletal pain conditions.Implications for rehabilitationPatients' early rating of the therapeutic alliance (TA) is associated with improvements seen on pain and functional outcomes.Physical therapists should assess the TA and use strategies to enhance the alliance to optimize patient's experiences with physical therapy.