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KMID : 0350519930460010223
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Journal of Catholic Medical College
1993 Volume.46 No. 1 p.223 ~ p.232
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Periodic Observation of Autogenous Tissue Grafts in Preformed Pseudosheath Pockets of Rabbit
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Abstract
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A lot of silicone implants have been used to augment bony or soft tissue deficiencies in congenital and acquired hypoplatic conditions. Sometimes, however, the implanted silicones cause problems such as infection, extrusion and deviation or
displacement. These complications require replacement of the silicone implants with autogenous graft. The purpose of this investigation is to observe the grafts which were placed in the preformed pseudosheath pocket by the implants.
The grafts of iliac bone, ear cartiage and ear dermis were respectively placed into the 3 pseudosheath pockets which had been formed by the silicone implants on paravertebral region of rabbits. The grafts were grossly and microscopically observed after
2, 4, 6 and 8 weeks after grafting, and they were compared with the same kinds of grafts which had been grafted under the panniculus carnosus on the opposite paravertebral region.
@ES The results were as follows :
@EN 1. On gross observation the graft in the silicone pseudosheath revealed fewer adhesion and resorption than the graft of opposite site especially in the case of the cartilage graft and in less irequency in the bone and dermis grafts. This seems
due to lesser local tissue reaction and free floating nature of the graft in the silicone pseudosheath.
2. On histopathologic examination the iliac bone graft in the silicone pseudosheath showed marked proliferation of granulation tissue, new capillary and osteoblast between 2 and 4 weeks after grafting. In the case of the cartilage graft in the silicone pseudosheth marked proliferation of chondroblast and new capillary infiltration were shown between 2 and 4 weeks after grafting. At 8 weeks after grafting fewer degenerated chodrocytes were noted in the cartilage graft in the silicone pseudosheath.
In the case of the dermis graft in the silicone pseudosheath marked proliferation of new capillary was noted beween 2 and 4 weeks after grafting.
This investigation showed that free autogenous tissue grafts, when placed in the preformed pseudosheath pockets survive better than that of the grafts placed in immediately formed surgical pockets. Presumably, it seems due to the absence of
hematoma in the preformed pseudosheath pocket and the fact that the pseudosheath would collapse and support the graft survival with its rich blood supply.
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