Test library › Shoulder & upper arm
Cross-body adduction (scarf) test
For: AC joint pathology
Pain from the acromioclavicular (AC) joint, where the collarbone meets the tip of the shoulder blade: arthritis, sprain or separation.
A weak test on its ownThese figures have not been confirmed against the full paper (checked against the abstract or a secondary source only).
What the numbers mean
- Positive result: a small shift: a positive result nudges the diagnosis up, but does not settle it.
- Negative result: a small shift: a negative result nudges the diagnosis down, but does not exclude it.
Source
Chronopoulos E, Kim TK, Park HB, Ashenbrenner D, McFarland EG. Diagnostic value of physical tests for isolated chronic acromioclavicular lesions. Am J Sports Med. 2004;32(3):655–661. Journal article · single study
Figures as they will appear in Rule It In, Rule It Out (Trokos, forthcoming). If a newer or better study changes them, this page changes with the book. Figures last updated from the book on 2 October 2026.
Get the book for the shoulder questions that matter: neck or shoulder, a painful cuff or a torn one, and an unstable joint or the labrum
This page gives the published figures. Rule It In, Rule It Out adds how to do this test, what counts as positive, how to read the result, and, where studied, whether combining it with other tests helps.
Coming in late 2026 as a PDF and a paperback. Join the list to hear when it's out
One study, one test, once a month
Rule It In is a free evidence letter for musculoskeletal clinicians: one recent study explained, one examination test with its real numbers. From Trokos, publisher of Rule It In, Rule It Out.