Patient Specific Total Knee Replacement

What is Patient Specific Total Knee Replacement?

Patient specific total knee replacement is a newer technology in total knee replacement surgery. It is an advanced procedure using an individualized patient-specific knee implant for replacement of all three components of the knee. The difference between patient specific total knee replacement from other knee replacement surgeries is the use of an MRI scan prior to the surgery that provides a clear view of the shape and structure of the different components of the joint. The implants are then designed specifically to match the natural shape of the articulating surfaces of the patient’s knee based upon the MRI. Unlike other knee replacement surgeries, custom- fitted total knee replacement can also be used for severe knee arthritis.

Patient Specific Total Knee Replacement Procedure

Prior to the surgery, several MRI scans are taken to understand the specific anatomy of the affected joint. Along with the MRI images, a special tool called a jig is also used to provide a clear view of implantation. The patient- specific jigs have a built-in image guidance which simplifies the surgical procedure and improves the outcome. Based on the MRI images the surgeon plans the surgery and calculates the cutting measurements that help the surgeon to remove the necessary amount of bone, at specific angles. This customized cut provides better implantation, more reliable alignment and removal of less amount of bone.

Benefits of Patient Specific Total Knee Replacement

There are several advantages to patient specific total knee replacement over the regular traditional implants, which include:

  • No compromise on the size of the implant as it is patient- specific
  • Provides better fit of the implant as the implant conforms to the patient’s unique shape of the articulating surfaces of the knee joint
  • Maximizes the implants contact area decreasing the polyethylene contact stress thereby prolonging the life of the implant
  • Preserves more natural bone
  • Maximizes proximal tibial coverage and thus reduces the risk of tibial implant caving in and loosening
Harvard University Brigham and Women's Hospital Boston Children's Hospital International Geriatric Fracture Society Dignity Health Banner Casa Grande Medical Center Rosalind Franklin University Maimonides Medical Center