Assessment of shoulder symptoms other than pain (instability, subluxation, looseness) will be measured by the Numerical Rating Scale (NRS) with numbers from 0 - 10 ("no symptoms" to "extreme symptoms"). The symptom level will be measured at baseline as the intensity of symptoms right now, and at 16 weeks follow-up. In addition, the worst, least and average symptoms levels for the latest week will be measured one time weekly.

Assessment of fatigue by the Checklist Individual Strength (CIS), subscale fatigue will be performed at baseline and at 16-week follow up to report the change in level of fatigue. CIS Subscale fatigue consists of 8 items each scored on a 7-point Likert scale (scores ranging from 8 to 56) with high scores indicating high levels of fatigue Timepoints: baseline, 16 weeks, 12 months

To assess the change in functional health status from baseline to 16 weeks follow-up the COOP/WONCA questionnaire will be used. The questionnaire is a generic health status questionnaire for General Practice patients. The questionnaire consists of six single-item measures; physical fitness, feelings (mental well-being), daily activities, social activities, besides change in health and overall health. The categories chosen are scored from one (good functional status) to five (poor functional status) (scores ranging from 6-30, best to worse) Timepoints: baseline, 16 weeks, 12 months

Tampa scale of Kinesiophobia is used to measure impression of change in fear of movement from baseline to 16 weeks follow-up. It consists of an 11-item scale where each question is scored on a 4 point Likert scale, with 1 indicating, "strongly disagree" and 4 indicating, "strongly agree". The total scores range from 11-44, with higher scores representing increased fear of movement.

The EQ-5D-5L measures change in health related quality of life and includes the EQ-5D descriptive system and the EQ visual analogue scale (EQ VAS).

The EQ-5D descriptive system comprises five dimensions (mobility, Self-care, usual activities, pain/discomfort and anxiety/depression). Each dimension is rated using a five-level ordinal scale from no problems to extreme problems. It results in a preference based index that range from states worse than death (<0), to 1 (full health), anchoring dead at 0. A score of one indicates that the participants perceived their health at the best possible state and a score below null that the participants perceived their health worse than death.

The EQ VAS measures change in health related quality of life. It includes a visual analogue scale where own health 'today´ is rated on a scale from 0 (worst imaginable health) to 100 (best imaginable health).

Maximum isometric voluntary contraction (MVC) in shoulder scaption, internal rotation and external rotation using a hand-held dynamometer (IsoForce Dynometer EVO2; Medical Device Solutions AG).

Internal rotation and external rotation with shoulder in 90 degrees of abduction is measured using a HALO digital goniometer (Halo Medical Devices, Subiaco, Australia).

Shoulder proprioception is measured in shoulder flexion angles (low and mid) using af HALO digital goniometer.

Patient Specific Functional Scale (PSFS) is administered verbally and used to evaluate whether a health condition impacts a patient's ability to perform activities that are important to him/her. On the initial assessment, the patient is asked to identify up to three important activities that are unable to do or are having difficulty with as a result of symptoms." The patient then provides a rating for each item, on an 11-point ordinal scale ranging from 0 ("unable to perform activity") to 10 ("able to perform activity at the same level as before the injury or problem"). During reassessments, the patient is prompted to re-rate the same activities. The average of up to 3 specific activity scores is recorded, and the range of possible scores is 0 - 10. Higher scores indicate less impairment.

Joint mobility and laxity parameters are assessed using load and shift, sulcus sign, Gagey, apprehension, relocation, release, Rotés Qúerol shoulder hypermobility test, shoulder flexion hypermobility test, and shoulder rotation hypermobility test, all of which are rated as dichotomous (yes/no).

Adverse events (AE) and serious adverse events (SAE) will be recorded by a weekly questionnaire and at 16-week and 12-month follow-ups by asking the patients about potential AEs using open-probe questioning to ensure that all AEs are recorded. AEs will be categorized into index shoulder or other sites and will be recorded and assessed for severity independent of whether or not there is a causal relationship with study treatments.

Western Ontario Stability Index questionnaire (WOSI) is a tool designed for self-assessment of shoulder function for patients with instability problems.

This questionnaire has 21 questions, each scored on a scale from 0 to 100, with 0 being the best score (no limitations related to the shoulder) and 100 representing the worst score.

Overall, the questionnaire is scored from 0-2100 points (better to worse). There are subscale components reporting on: physical symptoms (questions 1 through 10; maximum score of 1000); sports/recreation/work (questions 11 through 14; maximum score 400); lifestyle (questions 15 through 18; maximum score 400); and emotion (questions 19-21; maximum score 300).

The International Physical Activity Questionnaire (IPAQ) is a patient-reported measure of physical activity on a 12-item scale. The total score will be summed within each physical activity domain to estimate the total time spent in occupational, transport, household, and leisure related physical activity, as well as total time reported sitting per week. The total score ranges from 0 to the highest number of time (hours) that the participants can spent on physical activity. A higher score means higher level of physical activity.

To measure the patients self-rated impression of improvement at follow-up the GPE will be used related to the WOSI subscales (physical symptoms, sports/recreation/work, lifestyle, and emotions). GPE measures self-rated impression of improvement since baseline assessment on a 7-point scale (1 "worse, an important worsening" to 7 "better, an important improvement)

The number of exercise sessions that the patient completes out of 48 sessions.

Age, questions regarding civil status, educational level, employment, disease history and previous treatment.

Body mass index

Only answered by patients answering "no" to PASS. "Would you consider your current state as being so unsatisfactory that you consider the treatment to have failed?". Answered by "yes" or "no".

Patients will be evaluated on self-efficacy related to symptoms, which can be defined as an individual's confidence to successfully produce desirable results related to living with symptoms. The PSEQ has 10 items which are rated on a 7-point ordinal scale (ranging from 0: "not at all confident" to 6: "completely confident"). The maximum score is 60 and higher the score, higher the level of self-confidence of the patient to self-manage their symptoms.

Patient expectations of treatment effectiveness will be evaluated by asking 'How much do you expect your shoulder problem to change as a result of physiotherapy treatment', measured on a 7-point Likert scale ranging from 0 'worse than ever' to 7 'completely recover'