A tibial osteotomy appliance includes: a base, the first end of which is provided with a fixing part for fixing on a fixture outside the patient's body, and the second end of which contains a first guide rail； and a sliding seat which contains A first guide part is slidably engaged with the first guide rail, so that the sliding seat can slide along the first guide rail of the base. In addition, the sliding seat is provided with a second guide rail, so that the first and second guide rails project the ground In an orthogonal shape； a connecting seat including a second guide part that is in sliding fit with the second guide rail of the sliding seat, and the connecting seat is provided with a connecting part； and at least one osteotomy tool is provided with a connecting part, so that The connecting portion is connected to the connecting portion of the connecting seat.一種脛骨截骨器具，係包括：一基座，其第一端設有一固定部，用以固定在患者體外的一固定物上，而其第二端是含有第一導軌；一滑座，含有一第一導引部與該第一導軌滑動配合，使該滑座可以沿該基座的第一導軌滑移，另外，該滑座設有第二導軌，令該第一、二導軌投影地呈正交狀；一連接座，含有一第二導引部與該滑座的第二導軌滑動配合，且令該連接座設有一連接部；以及至少一截骨工具，設有一銜接部，令該銜接部銜接於該連接座的連接部。
