Patients will be asked to complete at least 6 outpatient PT sessions over a 4-week period. This will include an individualized impairment-focused approach, utilizing eccentric strengthening exercises of the rotator cuff to address any impairments or reinforce any standard of care manual treatment. Patients will also be given a home exercise program with instructions so that they can perform the eccentric strengthening exercises daily at home.

Patients will be asked to complete at least 6 outpatient PT sessions over a 4-week period. This will include an individualized impairment-focused approach, utilizing traditional rotator cuff strengthening exercises to address any impairments or reinforce any standard of care manual treatment. Patients will also be given a home exercise program with instructions so that they can perform the traditional rotator cuff strengthening exercises daily at home.

In addition to the treatment provided in the "Eccentric Exercise" Arm patients will receive additional self-management training education focused on neuroscience of pain principles.

This will include e a 5-minute video called "Understanding pain in less than 5 minutes, and what to do about it!", or aka "explain pain" video. The patients will also receive an interactive education booklet and review session with their PT, a series of weekly e-mails that reinforce key components of the booklet and video; and reinforcing messages when in the clinic doing their exercises.

Use of eccentric strengthening exercises in treatment plan during visits and at home.

This is a 100-point, 13-item self-administered questionnaire. It is divided into two subscales: a five-item pain subscale and an eight-item disability subscale. It is responsive to change and accurately discriminates between patients who are improving or worsening and has been reported to have a high test-retest reliability and internal consistency. A recent systematic review that compared four common shoulder questionnaires determined the SPADI was strongly correlated with the Disabilities of the Arm and Hand (DASH), American Shoulder and Elbow Surgeons (ASES) questionnaires and suitable for clinical use. The systematic review identified a minimal detectable change of 18 and a minimally clinically important difference of between 8-13 points.

Often defined as "the highest level of symptoms beyond which patients consider themselves well." This outcome measure has been used in previous studies looking at the effects of cervical thoracic thrust manipulation on shoulder pain. The question that will be asked to assess this level is, "Taking into account all the activities you have during your daily life, your level of pain, and also your functional impairment, do you consider that your current state is satisfactory?" Individuals who respond "yes" will be categorized as a success; thus, anyone reporting "yes" at baseline will be excluded from participation in the study. Between group differences at four time points will be assessed as percentage of subjects who find their current state acceptable, or answering "yes."