Osseointegration with Ceramic Coated Implant / 대한척추외과학회지

PURPOSE: This study was designed to clarify the osseointegration of the titanium screw coated with CMP, in regard to the time schedule, through the characteristic of early osseointegration. MATERIALS AND METHODS: Mechanical, radiological and histomophometric measurements were performed in 28 rabbit tibial proximal metaphyseal cortical bone screws 6, 12, 26 and 52 weeks after surgery for the in vivo comparison of the osseointegration of titanium screws (3.75 mm diameter, 5 mm length) with different surface treatments: CMP coating group, with the sol-gel method (experimental group) and uncoated group (control group). RESULTS: 1. Radiology: There were no differences between the two groups without a radiolucent line or in regard to the time schedule. 2. Histology: There were no differences between the two groups without a fibrous tissue intervening surface or in regard to the time schedule. 3. Torque test: The test results for the CMP coated group were 1.5 times higher than those for the uncoated group, which was statistically meaningful, but there was no difference in regard to the time schedule. CONCLUSION: CMP coating is an option to increase the osseointegration of the titanium screw.

Valgus Deformity after Non-displaced Fracutre of the Proximal Tibia in Children / 대한정형외과학회잡지

Tibia valga has been described as a consequence of non-displaced fractures of the proximal metaphysis of the tibia in children. There has been considerable speculation about the cause of this deformity. Four cases of estabilished valgus deformity following injury to the proximal tibia metaphysis in children are presented. In one case of them, it was showed that an infolding of a portion of the periosteum of the tibiain medial opening of this fracture. It was treated by surgical clearence of the infolding periosteum and varus osteotomy with slight over-correction and partial fibulectomy. The recurrence of valgus deformity was absent during post operative one year. In another case, roentgenogram showed an asymmetrical growth arrest line of the pmximal tibia. The presence of asymmetrical growth arrest lines in the pmximal metaphysis of the tibia demonstrates that the valgus deformity in this patient was caused by overgrowth of the medial portion of the proximal tibial epiphyseal plate. In the remainder, we observed the deformity developed without any specific cause.