as high as 1 4 gpa if an alloplastic material to serve as artificial ligament or as artificial tendon is implanted into the body there will form after a certain amount of time a matrix of natural soft tissue interpenetrating the fibers 5 enclosing the same and adhering to them this soft tissue will be equally stretched when the fiber formation 1 is stretched while the forces will become distributed onto the fiber formation 1 and the natural soft tissue when the length of an individual piece of fiber on which natural soft tissue has adhered is at least equal to the critical tear out length l defined in the introduction then the shearing force required for shearing the natural soft tissue off the fibers is larger than the fracture stress of the fiber when subjected to tension according to formula 2 the critical tear out length of fibers made of the named titanium niobium alloy and having diameters between 12 and 13 micrometers lies between 0 6 and 1 mm this is compared to the length of common ligaments and tendons too short so that the natural soft tissue as soon as it has grown into a short part of the alloplastic material will be able to compensate for unequal stresses in the fibers and if a fracture occurs in one fiber it will be able to transfer the force transmitted by the respective fiber onto the neighbouring fibers if the ratio v i e the share of the total cross sectional area of the fibers 5 of a bundle.