A femoral drill guide comprising: an alignment tool; a body comprising: a hole (6,8) extending therethrough for guiding a drill, a femoral intramedullary rod; the alignment tool comprising a first arm, a second arm, and a handle, the first and second arms (25,26) are pivotably mounted on the handle such that the distance between the first and second arms (25,26) can be altered, the first arm being operable to connect the alignment tool to the body, and the second arm being operable to connect the alignment tool to the femoral intramedullary rod such that the orientation of the body is fixable with respect to the femoral intramedullary rod in the anteroposterior plane and in a transverse plane, characterised in that the body further comprises first and second mounting holes for receiving the alignment tool and for use of the drill guide on a left or right knee, the first mounting hole being angled to the left lateral side of the body and the second mounting hole being angled to the right lateral side of the body; the first arm being configured to be received within each of the mounting holes. an alignment tool; a body comprising: a hole (6,8) extending therethrough for guiding a drill, a femoral intramedullary rod; the alignment tool comprising a first arm, a second arm, and a handle, the first and second arms (25,26) are pivotably mounted on the handle such that the distance between the first and second arms (25,26) can be altered, the first arm being operable to connect the alignment tool to the body, and the second arm being operable to connect the alignment tool to the femoral intramedullary rod such that the orientation of the body is fixable with respect to the femoral intramedullary rod in the anteroposterior plane and in a transverse plane, characterised in that the body further comprises first and second mounting holes for receiving the alignment tool and for use of the drill guide on a left or right knee, the first mounting hole being angled to the left lateral side of the body and the second mounting hole being angled to the right lateral side of the body; the first arm being configured to be received within each of the mounting holes. a hole (6,8) extending therethrough for guiding a drill, a femoral intramedullary rod; the alignment tool comprising a first arm, a second arm, and a handle, the first and second arms (25,26) are pivotably mounted on the handle such that the distance between the first and second arms (25,26) can be altered, the first arm being operable to connect the alignment tool to the body, and the second arm being operable to connect the alignment tool to the femoral intramedullary rod such that the orientation of the body is fixable with respect to the femoral intramedullary rod in the anteroposterior plane and in a transverse plane, characterised in that the body further comprises first and second mounting holes for receiving the alignment tool and for use of the drill guide on a left or right knee, the first mounting hole being angled to the left lateral side of the body and the second mounting hole being angled to the right lateral side of the body; the first arm being configured to be received within each of the mounting holes.