The Journal of Bone and Joint Surgery, Vol 72, Issue 9 1344-1348, Copyright © 1990 by Journal of Bone and Joint Surgery, Inc
Histological studies of the glenoid labrum from fetal life to old age
CC Prodromos, JA Ferry, AL Schiller and B Zarins
Orthopaedic Service, Massachusetts General Hospital, Boston 02114.
To help to resolve the controversy regarding the composition of the glenoid
labrum, thirty-eight shoulders from cadavera were examined grossly and
histologically. We used specimens for individuals of different ages so that
we could determine what changes occur as a result of aging. In children and
adults, the labrum appeared to be fibrocartilaginous tissue. The labrum was
a separate anatomical structure that could be distinguished from the
fibrous capsule of the shoulder. Neonatal labra were composed of primitive
mesenchymal tissue containing only few chondrocytes that modulated into
fibrocartilage in the first few years of life. Neonatal labra contained no
elastin, whereas specimens from adults had rare elastin fibers. The labrum
was sparsely vascularized throughout its substance, with no particular
pattern of distribution. Vascularity decreased with increasing age of the
individual.