Involvement of the subacromial bursa in impingement syndrome of the shoulder

Description: Our aim was to evaluate bursal involvement at different stages of the impingement syndrome as judged by conventional histopathological examination and expression of tenascin-C, which is known to reflect active reparative processes in different tissues and disorders.
Tenascin-C seems to be a general indicator of bursal reaction, being especially pronounced at the more advanced stages of impingement and this reaction seems to be an essential part of the pathology of impingement at all its stages.
Involvement of the subacromial bursa in impingement syndrome of the shoulder as judged by expression of tenascin-C and histopathology. Hyvönen P, Melkko J, Lehto VP, Jalovaara P. J Bone Joint Surg Br. 2003 Mar;85(2):299-305.