THE EVALUATION OF THE PULL OUT FORCE BETWEEN THE OSTEOCHONDRAL PLUG AND THE RECEIVING TUNNEL IN AUTOLOGOUS OSTEOCHONDRAL TRANSPLANTATION
Abstract:
The Osteochondral Autologous Transplantation is a technique which uses to implants in the area of a chondral defect osteochondral plugs harvested from a donor area for filling chondral defects. The stability of the plugs influence the outcome and the rehabilitation. The purpose of this study is to determine the pull out force between the plug and the receiving tunnel. We have performed 4 tunnels in a beef femoral condyle in each of them we have grafted a plug anchored by a metal wire. The femur was positioned in the Instron 5587 Testing Machine, then we have applied traction for each of the cilinders separately in ax until they were pulled out. The results shows that the plug has a good pull out resistance. The pull out force is increasing quickly until it’s maximum then it’s decreasing slowly at 100 N. The plug is moving inside the tunnel 35-40% of it’s lenght until it reach the maximum pull out force.
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