Published: 15-08-2010, 09:55

The epiphysis, metaphysis, and diaphysis

The growth plate in newborns is not constituted as an effective structure between the metaphysis and the epiphysis, and this transformation generally does not occur until between 12 and 24 months of age (Figure 1.2).
The epiphysis, metaphysis, and diaphysis

Figure 1.2. The configuration of the chondroepiphysis and its union with the greater trochanter in the neonate. This is contrasted with the presence of a secondary ossification center and an established growth plate as an effective barrier between the epiphysis and metaphysis, seen in the child between 12 and 24 months of age.

Injury or disease affecting the metaphysis or epiphysis in the very young child (i.e. under one year of age) can often damage all elements of the growth plate apparatus spreading directly across from one zone to another. Once the growth plate is constituted, an effective barrier then develops between the epiphysis and metaphysis. The cartilage epiphysis prior to developing a primary center of ossification is termed a chondroepiphysis and is, as would be expected, less resistant to injury and disease. Its primary function is to evolve into an appropriate shape to provide a joint surface for motion and to be sturdy enough to absorb and transmit the loading stresses imposed on that joint. It also provides protection for the underlying growth plate. The metaphysis is the most metabolically active area in growing bone, with the richest vascularity and the highest turnover of bone. The constant remodeling in this area allows for the internal reshaping of the bone in order to resist all manner of internal and external stresses. In a child, the large volume of cancellous bone compared with cortical bone in this region makes it obviously weaker than the cortical bone so prevalent in the diaphysis. For these accumulative reasons, bone pathology is most commonly reflected in the metaphysis (i.e., infection, tumors, and trauma). The diaphysis is composed for the most part of cortical bone surrounding the medullary canal. Therefore, this region is much stronger, less elastic, and more protective in nature to provide resistance to the tremendous daily forces applied, and to keep us from “shattering.” It must be remembered that the diaphysis also has a rich blood supply, and possesses periosteal and endosteal cells that can provide enormous amounts of new bone in times of stress (i.e., fracture).
{comments} {navigation} {addcomments}
<
shore excursions in Russia

29 June 2012 14:24

Информация к комментарию
  • Группа: Гости
  • ICQ: --
  • Регистрация: --
  • Публикаций: 0
  • Комментариев: 0
Great stuff from youR pediatric-orthopedics.org , man. Ive read your stuff before and youre just too awesome. I love what youve got here, love what youre saying and the way you say it. You make it entertaining and you still manage to keep it smart. I cant wait to read more from you. This is really a great blog.
<
Russia tours

19 September 2012 05:49

Информация к комментарию
  • Группа: Гости
  • ICQ: --
  • Регистрация: --
  • Публикаций: 0
  • Комментариев: 0
The best essential information is this, that you have try to do very well approaching for that homelessness body and their helping hand. I am so inspired about that, after read your this useful written articles and your opinions on pediatric-orthopedics.org also which is so attractive for do something for those good luck
^