Técnica de aumentación con injerto óseo molido de banco para el uso del tornillo condíleo dinámico en la metáfisis distal de fémur

Abstract

Objective

To prove the cancellous bone allograft augmentation efficacy, when the lag screw of the dynamic condylar screw is used at the distal femoral end.

Materials and methods

Ten knees of 5 cadaveric models were used to implant the dynamic condylar lag screw; the torque of the screw was quantified during the implantation. Then we proceed to generate a lack of fixation based on an axial compression implantation of the lag screw. The screw was removed and the augmentation technique with cancellous bone allograft performed, then we measure again the torque needed on the lag screw implantation. We proceed on the same way after generate a total loose of fixation based on an excessive reaim with a 13 mm reamer.

Results

The final maximum torque average at the primary screw implantation was 60 kg/cm². This augmentation technique improved the fixation in 10% roughly when it was used on the second implantation, and when we generate a worst situation based on an excessive reaim, the fixation obtained was 70% of the primary screw fixation force.

Conclusion

The cancellous bone allograft augmentation is a biological technique that demonstrated an improvement on the lag screw fixation, even in the worst bone structural deficit situations.