What is Partial Knee Replacement (PKR) surgery?

A partial knee replacement is surgery to replace only the part of the knee which is damaged.

The knee joint can be divided into 3 parts : the inner (medial) compartment, the outer (lateral) compartment and the kneecap (patellofemoral) compartment.

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If only one area is arthritic or damaged, the damaged bone and cartilage are removed and are replaced with an implant called a Prosthetic. The undamaged parts of the knee are preserved. This surgery can relieve pain and restore function, while minimizing the incision to allow for less pain and shorter recovery time.

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What if other areas of the knee are damaged/ arthritic?

Depending on the area damaged, the surgery is targeted to replace only the damaged part.

There are various options, which are customized to your specific needs. Implants include Medial PKR, Lateral PKR, Patellofemoral PKR, and even Bicompartmental PKR if two areas are damaged.

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If all three compartments are damaged, then surgery to replace the whole knee is called Total Knee Replacement (TKR).

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Why do a Partial Knee Replacement?

  1. Faster recovery and return to function
  2. More normal kinematics and function.
  3. Less bone resection
  4. Limited pain
  5. Less blood loss and other complications
  6. Smaller incisions

Surgery is targeted to remove only damaged bone and cartilage, preserving the other parts of the knee that are not affected. The more targeted and focused surgery results in less pain, and faster recovery. Additionally, the bone cuts are minimized and allow your surgeon to preserve your own knee ligaments, which result in a better functioning and more normal feeling knee joint.

Scientific papers:

  1. Rougraff BT, Heck DA, Gibson AE. A comparison of tricompartmental and unicompartmental arthroplasty for the treatment of gonoarthrosis. Clin Orthop Relat Res. 1991 Dec; (273): 157-164
  2. Laurencin CT, Zelicof SB, Scott RD, Ewald FC. Unicompartmental versus total knee arthroplasty in the same patient. A comparative study. Clin Orthop Relat Res. 1991 Dec; (273): 151-156
  3. Dutchman K et al. Differences in Short term complications between UKA and TKA : A Propensity Score Matched Analysis. AAHKS 23rd Annual Meeting, November 2013

Robotic-Arm assisted Partial Knee Replacement

Robotic-arm assistance is a new technique of performing a Partial Knee Replacement.

Your surgeon is aided by a pre-operative CT scan, intra-operative computerized tracking of soft tissue, and performs robotic-arm assisted bone cuts and  prosthetic implantation. This technology can multiply all the benefits of a conventional (non-robotic) Partial Knee Replacement.

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Benefits of Robotic-Arm assisted Partial knee replacement

Greater patient satisfaction than manual PKR
More ‘natural’ feeling knee compared to total knee replacement
Better range of motion
Less pain
Less invasive surgery
Faster, easier recovery
Less rehabilitation
Better outcomes
Consistent implant installations
Earlier return to activity / work
Tolerated better by elderly / less healthy patients
Reduction in duration of hospitalization

Is (Robotic assisted) Partial Knee Replacement right for you?

If you’re experiencing knee pain, we recommend you schedule an appointment to learn about non-surgical and potential surgical procedures. If partial knee replacement surgery is recommended be sure to discuss the Mako Technology option with your surgeon.