A bone implant includes (a) a first layer provided over a first outer surface of the bone implant and being formed of a first material which is one of water-soluble and degradable in body fluids, the first layer having a first thickness and (b) a second layer provided over an outer periphery of the first layer and being formed of a biocompatible material, the second layer having a second thickness smaller than the first thickness.一種骨植入物包括(a)提供在骨植入物的第一外表面上的第一層，並且此第一層係由第一材料製成，此第一材料是水溶性材料及可在體液中降解的材料中的一種，此第一層具有第一厚度，和(b)提供在第一層的外面上的第二層，並且此第二層係由生物相容性材料製成，此第二層的第二厚度小於第一厚度。
