A blade assembly (22, 210) for use with a sagittal saw assembly comprising a handpiece having a forwardly directed front face and a drive assembly (30, 34, 48) disposed inside said handpiece, the blade assembly (22, 210) comprising: an elongate guide bar (110, 212) adapted to, when coupled to the handpiece, extend forwardly from the handpiece front face and terminate at a distally directed face spaced from the handpiece front face, wherein the guide bar (110, 212) includes a bottom bar (116, 218), an inner bar (118, 220) and an outer bar (120, 222) that are stacked together, the inner bar (118, 220) holding the bottom bar (116, 218) and the outer bar in spaced relationship from each other, and wherein the inner bar (118, 220) contributes to the overall rigidity of the guide bar (110, 212); a saw blade (112, 214, 302) movably attached to said guide bar (110, 212) between the bottom and outer bars (218, 222), said saw blade (112, 214, 302) having teeth (168, 308) which extend outwardly beyond said guide bar distally directed face and said saw blade having a thickness dimension defined transversely to the elongated direction of said guide bar (110, 212); and a connecting member (114, 216, 312) extending in the space between the bottom and outer bars (218, 222) and having a first end adapted to be connected to the drive assembly (30, 34, 48) of the sagittal saw, and a second end connected to said saw blade (112, 214, 302) such that said connecting member (114, 216, 312), when driven by the drive assembly (30, 34, 48), is adapted to displace said saw blade (112, 214, 302) so that said teeth (168, 308) oscillate back and forth across said guide bar distally directed face; characterized in that said guide bar (110, 212) has a thickness dimension defined transversely to the elongated direction thereof, said thickness dimension being no greater than the thickness dimension of said saw blade (112, 214, 302), and wherein said connecting member (114, 216, 312) and said saw blade (112, 214, 302) comprise a monolithic, one-piece component. an elongate guide bar (110, 212) adapted to, when coupled to the handpiece, extend forwardly from the handpiece front face and terminate at a distally directed face spaced from the handpiece front face, wherein the guide bar (110, 212) includes a bottom bar (116, 218), an inner bar (118, 220) and an outer bar (120, 222) that are stacked together, the inner bar (118, 220) holding the bottom bar (116, 218) and the outer bar in spaced relationship from each other, and wherein the inner bar (118, 220) contributes to the overall rigidity of the guide bar (110, 212); a saw blade (112, 214, 302) movably attached to said guide bar (110, 212) between the bottom and outer bars (218, 222), said saw blade (112, 214, 302) having teeth (168, 308) which extend outwardly beyond said guide bar distally directed face and said saw blade having a thickness dimension defined transversely to the elongated direction of said guide bar (110, 212); and a connecting member (114, 216, 312) extending in the space between the bottom and outer bars (218, 222) and having a first end adapted to be connected to the drive assembly (30, 34, 48) of the sagittal saw, and a second end connected to said saw blade (112, 214, 302) such that said connecting member (114, 216, 312), when driven by the drive assembly (30, 34, 48), is adapted to displace said saw blade (112, 214, 302) so that said teeth (168, 308) oscillate back and forth across said guide bar distally directed face; characterized in that said guide bar (110, 212) has a thickness dimension defined transversely to the elongated direction thereof, said thickness dimension being no greater than the thickness dimension of said saw blade (112, 214, 302), and wherein said connecting member (114, 216, 312) and said saw blade (112, 214, 302) comprise a monolithic, one-piece component.