Execution
- 1Perform cross-body adduction and scores it positive only for localized AC-joint pain.
- 2Perform AC resisted extension and scores it positive only for localized AC-joint pain.
- 3Perform O’Brien active compression and scores it positive for AC-joint-localized pain rather than deep shoulder pain.
- 4Count the cluster as positive when all three tests are positive.
- 5Document that the target condition is chronic isolated AC-joint lesion rather than nonspecific shoulder pain.
Positive outcome
All three tests are positive: cross-body adduction, AC resisted extension, and O’Brien / active compression with AC-localized pain. This cluster is designed to improve rule-in confidence for chronic AC-joint lesions.
Studies
| Study | Reliability | Sn | Sp | LR+ | LR− |
|---|---|---|---|---|---|
| Chronopoulos et al. (2004) | NA | 25 | 97 | 8.3 | 0.77 |
CommentMagee’s eAppendix lists this three-test AC cluster with high specificity but low sensitivity. The LR+ is below 10 but clinically useful in the correct chronic AC-lesion context. It is poor for ruling out AC pain because many true cases will not have all three tests positive.
High Clinical Value