A surgical method and implant for directing and securing a replacement ligament into the femur or tibia of the knee. In the disclosed blends, the first comonomer is different from the second comonomer and the melt index of the first ethylene interpolymer is less than or equal to the melt index of the second ethylene interpolymer. The front seat may be provided with a multiplicity of positions to which it can be moved rearward. The buoyant device interacts with materials input into the fuel tank to actuate rotation of the rotating device. Using the alignment signal passing through the annealed polysilicon layer from the alignment feature, an exposure system is aligned with the substrate with improved results.