Surgical Safety and Effectiveness in Orthopedics: Swiss-wide Multicenter Evaluation and Prediction of Core Outcomes in Arthroscopic Rotator Cuff Reconstruction

The Oxford Shoulder Score (OSS) is a condition-specific questionnaire developed for patients with a degenerative or inflammatory state of the shoulder. It contains twelve items to be answered by the patient independently, which deal with pain (degree, time point) and possible handicaps in private and professional life.

There are five categories of response for every question, corresponding to a score ranging from 0 to 4. Scores are combined to give a single score, with a range from 0 (worst outcome) to 48 (best outcome).

this event was defined as a postoperative restriction in passive shoulder motion diagnosed within 6 months after ARCR in at least two of the motion planes of flexion, abduction and external rotation in 0° abduction. Motion restriction is to be assessed separately for each plane

• Recurrent defect of repaired tendon(s) at 12 months: at least one repaired tendon is diagnosed with a recurrent defect by ultrasound examination.- Persistent or worsening pain
• Infection
• Any local event

The Constant-Murley score (CMS) is a 100-points scale composed of a number of individual parameters. These parameters define the level of pain and the ability to carry out the normal daily activities of the patient. The scale is from 1 to 100 with higher scores indicating better outcome.

Highest possible Weight load of the Shoulder measured by dynamometer

The Numeric Pain Rating Scale (NPRS) is a unidimensional measure of pain intensity in adults.

The NPRS is a segmented numeric version of the visual analog scale (VAS) in which a respondent selects a whole number (0-10 integers) that best reflects the intensity of his/her pain. A Higher Score means a worse outcome. The common format is a horizontal bar or line. Similar to the VAS, the NPRS is anchored by terms describing pain severity extremes.

The Oxford Shoulder Score (OSS) is a validated patient-reported outcome measure (PROM). It's a shoulder-specific instrument designed to assess the outcome of all shoulder surgeries (with the exception of instability surgery). The combined total gives a minimum score of 12 and a maximum of 60. Higher scores in the OSS imply worse functionality while lower scores imply better functionality.

The SSV is defined as a patient's subjective shoulder assessment expressed as a percentage of an entirely normal shoulder, which would score 100%

Nonrestorative sleep (NRS) is defined as the subjective experience that sleep has not been sufficiently refreshing or restorative. On a scale from 0-10, 0 is best possible outcome measure and 10 is worst possible outcome measure.

Return to work, change of working condition is measure in a standardized questionnaire noting among others absences

Measured by Patient-Reported Outcomes Measurement Information System (PROMIS) scores. For PROMIS measures, higher scores equals more of the concept being measured.

Patient perceived shoulder functionality change, acceptability of own symptom state are measured with emphasis on minimally clinically important differences as stated in the cited literature with the according scored measurements

Measured through EuroQoL version (EQ-5D-5L). The EQ-5D-5L essentially consists of 2 pages: the EQ-5D descriptive system and the EQ visual analogue scale (EQ VAS). The descriptive system comprises five dimensions: mobility, self-care, usual activities, pain/discomfort and anxiety/depression. This tool has an overall health scale where the rater selects a number between 1-100 to describe the condition of their health, 1 being the worst and 100 being the best possible outcome.

AEs reported by clinicians and patients (including non-local AEs within 6 months after surgery) b. Final independent surgeon and patient-rated assessment of AEs according to perceived severity and relation to treatment (according to perceived severity (rating scale from 0 [no complication] to 100 [death] [67]) and disturbance) c. Comprehensive Complication Index (CCI)

Final independent surgeon and patient-rated assessment of AEs according to perceived severity and relation to treatment (according to perceived severity (rating scale from 0 [no complication] to 100 [death]) and disturbance)

Comprehensive Complication Index (CCI): The Comprehensive Complication Index is based on the complication grading by Clavien-Dindo Classification and implements every occurred complication after an intervention. The overall morbidity is reflected on a scale from 0 (no complication) to 100 (death).

Postoperative integrity status of the rotator cuff classified by MRI

Rotator cuff muscle fatty infiltration by MRI

Status of repair implants e.g. anchors by MRI