a non - resorbable flexible prosthesis includes a composite made of an elastomeric matrix and a plurality of hydroxylapatite particles dispersed throughout the matrix . the hydroxylapatite particles form about 25 %- 70 % by weight of the prosthesis . the matrix is cured to form a flexible prosthesis such that an applied force can distort the flexible prosthesis from its original shape and the flexible prosthesis will substantially return to its original shape when the applied force is removed .