Validation of a Clinical Prediction Rule to Identify Patients With Shoulder Pain Likely to Benefit From Cervicothoracic Manipulation: A Randomized Clinical Trial

The investigators have recently identified prognostic variables in a preliminary Clinical Prediction Rule (CPR) that are purported to identify patients with shoulder pain who respond favorably to cervicothoracic spinal manipulative therapy (SMT) and daily home exercises of cervical and thoracic active range of motion exercises. These prognostic variables have been identified in a single study, and therefore it is not known if these factors will be valid in a different group of patients, even ones with similar characteristics as those used in the investigators' initial exploratory study. Further study of these identified factors is needed for validation in an independent sample of patients, which will improve generalizability for clinical practice. In this study, patients with a primary complaint of shoulder pain will be randomly assigned to receive cervicothoracic spine manipulation followed by therapeutic exercises or therapeutic exercise alone. If the variables are in fact meaningful, patients who exhibit 3 or more of the identified prognostic variables and receive cervicothoracic SMT should experience improved outcomes compared to patients who have less than 3 of these variables and receive the same intervention. Additionally, patients who exhibit 3 or more of the identified variables that receive cervicothoracic SMT should also have superior outcomes to patients who exhibit 3 or more of the identified variables and receive an alternate intervention (exercise only). Finally, the investigators will determine if the addition of cervicothoracic SMT to exercise improves outcomes as compared to exercise alone.