Establishing Clinical Significance in Rotator Cuff Disease

The goal of this observational study is to learn about rotator cuff patients. The main questions it aims to answer are: * What is the minimal clinically important difference value of the Shoulder Disability Questionnaire, the short version of the Western Ontario Rotator Cuff Index, the Shoulder Rating Questionnaire, and the University of California-Los Angeles Shoulder Scale? * What is the substantial clinical benefit value of the Shoulder Disability Questionnaire, the short version of the Western Ontario Rotator Cuff Index, the Shoulder Rating Questionnaire, and the University of California-Los Angeles Shoulder Scale? * What is the patient-acceptable symptomatic state value of the Shoulder Disability Questionnaire, the short version of the Western Ontario Rotator Cuff Index, the Shoulder Rating Questionnaire, and the University of California-Los Angeles Shoulder Scale? * What is the maximal outcome improvement value of the Shoulder Disability Questionnaire, the short version of the Western Ontario Rotator Cuff Index, the Shoulder Rating Questionnaire, and the University of California-Los Angeles Shoulder Scale? * What are the risk factors that prevent rotator cuff patients from reaching the minimal clinically important difference value? * What are the risk factors that prevent rotator cuff patients from reaching the substantial clinical benefit value? * What are the risk factors that prevent rotator cuff patients from reaching the patient-acceptable symptomatic state value? * What are the risk factors that prevent rotator cuff patients from reaching the maximal outcome improvement value?