Patient-Specific Partial and Total Knee Replacement entails use of sophisticated 3D-printing to plan and perform knee surgery.
Unlike traditional surgery in which surgeons use mechanical instruments and tools to measure, prepare and align a prosthesis, in PSI knee surgery, modern imaging (either 3D CT or MRI) is performed preoperatively and is used to generate a 3D image of your knee joint. After careful analysis of your knee, computerised “virtual planning” is performed and patient-specific surgical planning instruments are then 3D printed in Switzerland, sterilised and then sent to Australia for your surgery.
In Mr Freedman’s opinion, PSI surgery offers a number of potential advantages:
- Less Invasive Surgery:
– In traditional partial or total knee replacement a hole needs to be created in the femur to allow passage for a long steel rod to be passed up inside the bone to assess the position of the femur. This is completely avoided in the PSI technique, as a custom patient-specific guide is 3D printed to just fit neatly over the end of the bone.
– In the older “navigation technique” multiple pins need to be drilled into the femur and tibia to tell where the bones are in space. This is also completely avoided with the PSI technology.
- Accurate Surgical Planning: Rather than relying on old fashioned X-rays as is traditionally done, the sophisticated 3D MRI or CT imaging allows for very detailed assessment of the joint and accurate surgery planning
- Accurate Prosthesis Alignment:
The 3D-printed patient specific guides are manufactured to perfectly fit the accurate 3D-printed model of the knee joint. This facilitates highly accurate positioning of the implant. Accurate alignment of the implant is important to achieve longevity of the implant