PURPOSE: To obtain a similar flexural modulus to a contacted bone tissue during use and increase an useful period in a formulatable complex material by curing an intimately composed mixture consisting of an addition polymerized composition and at least one particulate inorganic solid occupying a most part of the complex material. CONSTITUTION: A formulatable complex material is obtained by curing an intimately composed mixture consisting of an addition polymerized composition, i.e. a component A, and at least one particulate inorganic solid occupying up to 80vol.% of the complex material, i.e., a component B. The component A contains =1 unsaturated carbon - carbon double bond of addition polymerized olefin per one molecule on average. As the suitable particulate inorganic solid component usable as the component B or usable in the component B, especially hydroxyapatite, talc, mica, alumina and silica, preferably glass such as borosilicate glass, are mentioned. For example, a metallic alloy cover 2 with a number of keys 3 are arranged on a femur head 1. The cover 2 is a part of a mold for curing of the composition A, and the keys 3 are enclosed in the head during cure.
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