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e-CASES: Acromiohumeral distance

Dr Antoine Micheau , CHU ARNAUD DE VILLENEUVE , Montpellier , Herault , FRANCE

Acromiohumeral distance measured on conventional radiography :

  • Anteroposterior radiographs with the arm in neutral position
  • Beam angled 20° craniocaudally
  • Humeral head centered in the glenoid fossa, and acromion profiled.
  • Patient in the upright position.
  • Measurement performed from the dense cortical bone at the inferior aspect of the acromion to the subchondral lamina of the humeral head.

Normal : 7-15 mm
If < 7 mm : full-thickness supraspinatus tendon tears present in 90%

Ref : Saupe N, Pfirrmann CWA, Schmid MR, Jost B, Werner CML, Zanetti M. Association between rotator cuff abnormalities and reduced acromiohumeral distance. AJR 2006;187 : 376-382