What is

Computer Navigated Knee Replacement? (CNKR)

A total knee replacement (TKR) or total knee arthroplasty is an operation to replace a knee joint that is affected by arthritis.

The camera is used to identify the centre of the hip joint.

This is important in determining the alignment of the prosthesis. A registration tracker is then utilized to record specific anatomical landmarks in the knee such as the surface of the bone, the middle of the thigh bone etc.

During the surgery, trackers are attached to the bone.

The tracker is identified by a camera.

The computer then positions a cutting guide. This cutting guide can be adjusted to precisely cut the bone at a specific angle or depth.

It is the improved accuracy of these cuts that may lead to the improved function and survivorship of the knee replacement.

Does everyone need a (CNKR)?

No, the computer is only an aid to surgery. It enhances information but doesn't replace an experienced surgeon.

Is the computer failsafe?

Computer navigation isn't failsafe; it relies on accurate data and proper placement of trackers and blocks.
"Rubbish in = rubbish out."

When should computer
navigation be used?

Computer navigation is most useful in more complex cases.

In a case where anatomy is severely distorted through disease or trauma. For example a previous fracture above or below the knee where the bone may be deformed and the conventional method of placing the cutting blocks may be more difficult or not possible.

Are computer navigation results
better than conventional knee placement ones?

The answer to this question is still a matter of great debate and more time and studies are required to determine this answer.

A lot of studies have shown that the use of navigation has improved the xray alignment of the knee replacements but it has yet to be conclusively shown that this results in an improved clinical outcome or that the prosthesis survives longer.

Are there any
disadvantages to using computer navigation?

Like with all new technology, there is a learning curve and a new technique to get used to.

Computer navigation usually is associated with a longer operation time. This time difference decreases with experience and familiarity with the technology. Because extra pins are used to attach the trackers to the bone, there is a very small chance of fracturing the bone or experiencing irritation or an infection at the pin site.

Do you need a

Knee replacement?

Dr Seeto in affiliation with Medibank Private and East Sydney Private hospital, offers a program for eligible Medibank Private Members, to eliminate medical out of pocket costs for your Knee Replacement.

The program includes a pre-surgery preparation program, spending the minimal time necessary in hospital, as well as home rehabilitation if necessary.