|
Year |
2002 |
|---|---|
|
Question Number |
259 |
|
Category |
Orthopaedic Science |
Question
Following tibial Ilizarov lengthening in animals, histologic examination of the anterior tibial artery typically shows a significant increase in the
1) number of vasavasorum
2) thickness of the intimal wall
3) diameter of the collagen fibers in the vessel wall
4) diameter of the elastic fibers in the vessel wass
5) inflammatory response to tearing of the intima
Figures
Answer (click for answer)
Preferred Response: 1
The referenced article involves a rabbit study in which long bones were fractured, lengthened, allowed to heal and then histologically evaluated. The results were no change in the vascular wall including tunica or adventitia, no increase in collagenous or elastic fibers and no change in the overall dimensions of the vessel. The only not change was an increase in the number of vasa vasorum. These finding led the authors to conclude that vessel response was not a limiting factor in limb lengthening.
Reference: Ippolite E, et al: Histology and ultrastructure of arteries, veins, and peripheral nerves during limb lengthening. Clin Orthop 1994; 308:54-62.