Unicondylar cutting block

A unicondylar posterior cutting block comprising:

• a base which is mountable on a resected proximal tibial surface of a knee of a patient in use;
• and
• a body pivotally attached to the base, the body including an alignment formation arranged to align with a marking on a femur in use, the body defining a cutting guide therein for receiving a cutting instrument to make a unicondylar posterior cut in the femur and wherein moving the alignment formation to align with the marking on the femur causes the body to rotate relative to the base and to tilt the cutting guide relative to the base,
• wherein a rear face of the cutting block defines a first plane, and the cutting guide defines a second plane and wherein the first plane and the second plane subtend an acute angle of less than 80°.

A method for making a unicondylar posterior cut to a femur of a knee of a patient, comprising:

• positioning a unicondylar posterior cutting block on a resected proximal tibial surface of a tibia of the knee of the patient and adjacent a distally resected condyle of a femur of the knee of the patient and with the knee in flexion, wherein the cutting block comprises a base and a body, the body being rotatable relative to the base and the body defining a cutting guide therein;
• aligning an alignment feature attached to the body with a marking on the femur to rotate the body relative to the base;
• fixing the body to the femur;
• and
• using the cutting guide to make a posterior femoral cut with a cutting tool.