An osteotomy blade-plate assembly (100, 200) for fixing of osteotomies and fractures to a bone tissue, the assembly (100, 200) comprising: - a modular plate component (102, 202) having an anterior surface (108, 208), a posterior surface (110, 210) and a side surface (109, 209) that collectively define a proximal portion (112, 212), a distal portion (116, 216) and a transition portion (114, 214) formed between the distal portion (116, 216) and proximal portion (112, 212), wherein the proximal portion (112, 212) is oriented along a first longitudinal axis (400, 418) and the distal portion (116, 216) is oriented along a second longitudinal axis (402, 416), and wherein the transition portion (114, 214) is oriented along a third axis (404, 420); and - a modular blade component; characterised in that the modular blade component has a support portion configured to be coupled to the plate component (102, 202) and a blade portion extending axially outward from the support portion along a fourth axis that is in perpendicular relation relative to the first longitudinal axis (400, 418), wherein the blade portion defines a channel, the channel being adapted to allow a guide wire to extend through the modular blade component to aid in implantation thereof; and the osteotomy blade-plate assembly further comprises a connector configured to couple the plate component (102, 202) to the support portion of the modular blade component, wherein the first longitudinal axis (400, 418) is in parallel relation relative to the second longitudinal axis (402, 416), the third axis (404, 420) is oriented at an angle relative to the first (400, 418) and second (402, 416) longitudinal axes, and the fourth axis is in perpendicular relation relative to the second longitudinal axis (402, 416), or wherein the second longitudinal axis (402, 416) is oriented at an angle relative to the first axis (400, 418), the third axis (404, 420) is in perpendicular relation relative to the first axis (400, 418) of the proximal portion (112, 212), and the fourth axis is in parallel relation to the third axis (404, 420) of the transition portion (114, 214). - a modular plate component (102, 202) having an anterior surface (108, 208), a posterior surface (110, 210) and a side surface (109, 209) that collectively define a proximal portion (112, 212), a distal portion (116, 216) and a transition portion (114, 214) formed between the distal portion (116, 216) and proximal portion (112, 212), wherein the proximal portion (112, 212) is oriented along a first longitudinal axis (400, 418) and the distal portion (116, 216) is oriented along a second longitudinal axis (402, 416), and wherein the transition portion (114, 214) is oriented along a third axis (404, 420); and - a modular blade component; characterised in that the modular blade component has a support portion configured to be coupled to the plate component (102, 202) and a blade portion extending axially outward from the support portion along a fourth axis that is in perpendicular relation relative to the first longitudinal axis (400, 418), wherein the blade portion defines a channel, the channel being adapted to allow a guide wire to extend through the modular blade component to aid in implantation thereof; and the osteotomy blade-plate assembly further comprises a connector configured to couple the plate component (102, 202) to the support portion of the modular blade component,