Abstract
1. A radiological study of the acromio-humcral interval in sixty normal shoulders and in fifty-nine shoulders with known tears of the rotator cuff is reported.
2. The normal acromio-humeral interval was found to be seven to fourteen millimetres, a range that is consistent with previous observations.
3. Narrowing of this interval is a frequent concomitant of a tear of the rotator cuff.
4. An interval of five millimetres or less should be considered compatible with a tear of the rotator cuff until proven otherwise.
5. An explanation of the pathomechanics of the observation has been proposed.
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