Maurer H J, Schreiner M
Z Orthop Ihre Grenzgeb. 1984 Nov-Dec;122(6):803-9. doi: 10.1055/s-2008-1045070.
The authors report on ossification variants: roughness (Ludloff: protruberances), so-called isolated ossification centers or islands and accessory ossification centers which are illustrated with reference to personal observations. Their clinical significance is pointed out. The existence of osteochondrosis dissecans in children and pre-adolescents is refuted, especially since no histologically proven observation has been described in the literature.
粗糙（Ludloff：突起）、所谓的孤立骨化中心或岛以及副骨化中心，并结合个人观察进行了说明。指出了它们的临床意义。反驳了儿童和青少年前期存在剥脱性骨软骨炎的观点，特别是因为文献中未描述有经组织学证实的观察结果。
