A lightweight femoral stem is disclosed, which is made by an additive manufacturing or a 3D printing approach in one piece having a base pole which includes: at least one inner mesh body located in the base pole and a fusion layer surrounding the inner mesh body. A hollow structure of the inner mesh body is formed by a plurality of beams and has multiple holes mutually inter-stacked. The fusion layer has at least one zone that is constituted by a hollow-shaped outer mesh body made of a plurality of micro-beams and the outer mesh body has multiple micro-holes mutually inter-stacked. The density (kg/m3) of the inner mesh body is not the same as that of the outer mesh body. The disclosed invention reduces greatly the weight of the femoral stem by having an inner mesh body and outer mesh body that have multiple holes and micro-holes, which is able to ease the burden on patients body. In addition, by having a different density arrangement of the inner and outer mesh bodies, the disclosed invention improves flexural and shear strength.一種羽量化之股骨柄,係以金屬粉末積層(additive manufacturing或3D printing)一體成型,其中該基柱,係包括:至少一內網格體,位於該基柱的裡部,各該內網格體是由多數小樑所組成的鏤空狀結構,而具有多數相互堆疊之洞孔;以及融合層,包圍在該內網格體的外圍,該融合層至少有一區域,是由多數微樑所組成呈鏤空狀的外網格體所構成,該外網格體具有多數相互堆疊之微孔,且令該內網格體之密度(kg/m3)與外網格體之密度(kg/m3)不相等;使本發明除藉由呈多孔隙之內、外網格體,大大降低股骨柄之重量,降低病患身體負荷外,藉由不同密度排列之內、外網格體,可提高本發明之抗彎及抗剪能力。(10)‧‧‧股骨柄(10’)‧‧‧延伸骨柄(11)‧‧‧基柱(111)‧‧‧內網格體(112)‧‧‧融合層(112a)‧‧‧外網格體(12)‧‧‧柄頭(121)‧‧‧人工股骨頸(13)‧‧‧銜接穴(14)‧‧‧工具連接穴(15)‧‧‧連接孔
