Jig for guiding placement of femoral component of the implant in knee replacement surgery

A jig for guiding placement of femoral component of the implant in a knee replacement surgery (J) mainly comprises of:

• Posterior paddles (PP),
• Posterior slots for bushings (in Posterior paddles) (PPS),
• Posterior Bushing (PBU),
• Distal block (DB),
• Distal slots for bushings (in Distal block) (DBS),
• Distal bushing (DBU),
• Anterior probe with adjustable height (AP),
• Probe (PB),
• Measuring cylinder (MC),
• Locking bolt (LB),
• Anterior cutting block (for cutting distal femur) (AB),
• Slot for saw blade (SL),
• Holes (HO);
• Said Jig (J) has a pair of Posterior paddles (PP) made preferably of metal and having posterior slots (PPS) to accept posterior bushings (PBU);
• said pair of Posterior paddles (PP) touches the posterior medial (P4) and posterior lateral (P3) femoral condyle while placing present jig (J) on distal femur wherein present jig (J) rotated posteriorly from the point of contact (posterior condylar axis) on either the lateral or medial posterior femur (P3 and P4) with the help of a bushing (PBU) of 1 mm increment to achieve precise rotation;
• said Distal block (DB) is provided with a pair of Distal slots for bushings (DBS) for accepting Distal bushing (DBU) wherein said Distal block (DB) is a continuous metal sheet at right angles to the Posterior paddles (PP);
• said Distal block (DB) touches distal medial (P2) and distal lateral femur (P1) while it be Jig (J) is placed on the distal femur wherein the present jig (J) is rotated medially or laterally from the point of contact on either the lateral or medial distal femoral condyle with the help of a bushing (DBU) of 1 mm increment to achieve precision;
• said anterior probe with adjustable height (AP) having a sliding adjustable probe (PB) is provided wherein said probe (PB) is of variable height off the distal block (DB);
• it has a Measuring cylinder (MC) which is attached to said distal block (DB) through Locking bolt (LB);
• wherein the femoral component is placed in flexion by decreasing the antero-posterior distance;
• similarly, the femoral component is placed in extension by increasing the antero-posterior distance;
• an anterior cutting block (for cutting distal femur) (AB) is also provided with Slot for saw blade (SL) for taking femur cuts;
• this is a detachable block (AB) made preferably of metal attached to the distal block (DB);
• said anterior cutting block (AB) has holes (HO) to increase the depth of the distal femoral cut by 1, 2, or 3 mm.