Biomedical Engineering Reference
In-Depth Information
Biocomposite interference screws are commonly used now in the knee surgery.
Initial fixation strength and ease of insertion are vital to the stability of the recon-
struction of ACL, especially with soft tissue grafts and in the tibial tunnel.
In our study several new design features of an innovative interference screw were
proposed in order to ameliorate press-fit fixation without damaging the graft. We
proposed a self-tapping screw with conical shape and three cutting flutes at the dis-
tal end and cylindrical shape at the proximal end. The thread is different for these
two zones, more aggressive at the conical zone to easily penetrate the cortical bone,
while on the cylindrical zone the attack angle of the thread is bigger in order not to
damage the graft. Screw design optimization was made by changing the values of
the attack angles of the screw thread shapes and by determining different values of
the pullout force using finite element analysis.
However, as already mentioned, it is the combination between the design and
material which guarantees the integrity of the screw during insertion, the tissue
regrowth, and the stability of fi xation.
References
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screws for fixation of bone-patellar tendon-bone autograft in arthroscopic anterior cruciate liga-
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11. Pena F, Grøntvedt T, Brown GA, Aune AK, Engebretsen L (1996) Comparison of failure
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during healing. Arthroscopy 15:818-826
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