An osteotomy system, typically for tibial alignment correction, includes a wedge implant and an osteotomy guide. The wedge implant is generally U-shaped and its upper and lower surfaces may be inclined with respect to one another in two orthogonal planes to correct respective misalignments. The osteotomy guide controls cutting of the osteotomy opening and the drilling of a hole defining the apex of the osteotomy, forming a bony hinge about which the osteotomy may be opened.