J sign (shoulder)

Dr Henry Knipe and Assoc Prof Frank Gaillard et al.

The J sign refers to the appearance of the inferior glenohumeral ligament in the presence of humeral avulsion of the glenohumeral ligament (HAGL lesion) as well as in the less common glenoid avulsion of the glenohumeral ligament (GAGL lesion).

Radiographic features


The normal U-shaped inferior glenohumeral recess is retracted away from the humerus, appearing in the shape of "J" in the right shoulder, or reversed "J" in the left shoulder in coronal oblique views in HAGL lesion 2, and reverse of this for GAGL lesions 3.

Inspired signs

Article information

rID: 7516
Section: Signs
Synonyms or Alternate Spellings:
  • J sign of shoulder
  • J-sign of shoulder

Support Radiopaedia and see fewer ads

Cases and figures

  • Case 1: HAGL
    Drag here to reorder.
  • Case 2: HAGL
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.