Accuracy of Patient Specific Cutting Blocks in Total Knee Arthroplasty

Figure 5

Key steps in PSCB technique: the tibial contact points are identified with the help of the cutting block in conjunction with the model (a). The tibial cutting block is adapted to the contact points on the patient’s tibia (b). If optimal fitting is achieved, the resection plane through the cutting block is compared with the one drawn at the tibia model (c). Rotational alignment is controlled with the extramedullary telescopic rod (d). When correct cutting block position is achieved, it is secured to the proximal tibia and the tibial cut is performed. For the femoral cut, the distal femur is exposed and soft tissue/cartilage covering the landmarks is removed. The PSCB is positioned on the patient’s femur and fixed before the distal femoral cut is performed (e). Femoral rotation is determined with drilling of two anterior referencing pin holes through the cutting block (asterisk) before performing the femoral cut.