Tightness of the posterior capsule may result from a localised capsular sprain, repetitive strains or muscular dysfunction.
Though a posterior tightness usually does not provoke much problems of itself, several studies suggest that it may be a possible cause of shoulder impingement.
A normal capsular laxity allows the humeral head to remain centered during scapulo-humeral abduction. However, if there is some posterior capsular thightness, the posterior roll of the humeral head will be absent and the head of the humerus is forced to glide in a cranial direction during the elevation. This may cause squeezing of the cuff between the humerus and the undersurface of the coraco-acromial arch.
Posterior capsular tightness may be an important contributution to the pathogenesis of rotator cuff lesions, and should therefore be treated.
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