Our review provides anchor-based MID estimates , as well as a rating of their credibility , for PROMs for patients with shoulder conditions .
The MID estimates inform the interpretation for a linked systematic review and guideline addressing subacromial decompression surgery for shoulder pain , and could also prove useful for authors addressing other interventions for shoulder problems .
OBJECTIVES To identify credible anchor-based minimal important differences ( MIDs ) for  patient-reported outcome measures  ( PROMs ) relevant to a BMJ Rapid Recommendations addressing subacromial decompression surgery for shoulder pain .
Responsiveness and Minimal Clinically Important Change: A Comparison Between 2 Shoulder Outcome Measures.
Study Design A prospect i ve cohort study nested in a r and omized controlled trial . Objectives To determine and compare responsiveness and minimal clinical ly important change of the  modified Constant score ( CS )  and the  Oxford Shoulder Score ( OSS ) .  Background The OSS and the CS are commonly used to assess shoulder outcomes . However , few studies have evaluated the measurement properties of the OSS and CS in terms of responsiveness and minimal clinical ly important change . Methods The study included 126 patients who reported having difficulty returning to usual activities 8 to 12 weeks after arthroscopic decompression surgery for subacromial impingement syndrome . The assessment at baseline and at 3 months included the  OSS , the CS  , and the  European Quality of Life-5 Dimensions-3 Level ( EQ-5D-3L ) index . Responsiveness was assessed as follows : by correlation analysis between the change scores of the OSS , CS , and EQ-5D-3L index , and the Patient Global Impression of Change ( PGIC ) scale ; by receiver-operating-characteristic ( ROC ) curve analysis using the PGIC scale as an external anchor ; and by effect-size statistics . Results At 3 months , a follow-up assessment of 112 patients ( 89 % ) was conducted . The change scores of the CS and the OSS were more strongly correlated with the external anchor ( PGIC scale ) than the change score of the EQ-5D-3L index . The areas under the ROC curves exceeded 0.80 for both shoulder scores , with no significant differences between them , and comparable effect-size estimates were observed for the CS and the OSS . Minimal clinical ly important change ROC values were 6 points for the OSS and 11 points for the CS , with upper 95 % cutoff limits of 12 and 22 points , respectively . Conclusion The CS and the OSS were both suitable for assessing improvement after decompression surgery
Our review provides anchor-based MID estimates , as well as a rating of their credibility , for PROMs for patients with shoulder conditions .
The MID estimates inform the interpretation for a linked systematic review and guideline addressing subacromial decompression surgery for shoulder pain , and could also prove useful for authors addressing other interventions for shoulder problems .
OBJECTIVES To identify credible anchor-based minimal important differences ( MIDs ) for  patient-reported outcome measures  ( PROMs ) relevant to a BMJ Rapid Recommendations addressing subacromial decompression surgery for shoulder pain .