Want to understanding the effects of mal-alignment?  Think about the soles of your shoes. Walk on the outside of your feet regularly and what happens to your shoes? They start to wear on the outside.

So instead of your weight being distributed equally to the entire surface of the bottom of your foot, the forces are concentrated on a much smaller area on the outside.  You wear out the lateral portion of your shoe much more quickly than the inside.

Let’s think about another common example: Wheel alignment

When your wheel alignment is off, what happens to your tires- they wear unevenly.The faulty alignment will cause some portions of the tire to be in contact with the road surface more than others and they will naturally wear faster.

Greater forces = increased wear on the surface

For a more complicated discussion of the finer points of wheel alignment go here. (I suggest this link because when you realize how complicated wheel alignment is, you will naturally wonder how complicated it might be getting your own knee aligned correctly)

Proper alignment in a knee replacement is necessary to distribute forces equally across the surface of the implant to ensure that there are no places that will wear out faster than others.

So now we come to the question of incision length.There is an optimal length where the surgeon has enough room to get the correct fit. Make the incision any smaller and you are asking him to perform the surgery looking through a hole about double the end of a paper towel roll- mostly for the sake of vanity.

Needless to say ultra small incisions can seriously impair the long term success of the surgery.

So when someone uses the marketing term “minimally invasive”, find out what they are really saying. Practically all knee replacement surgeries are minimally invasive in that no one is simply making a huge cut like they used to in the 80’s. And the majority of the surgeons use quad sparing techniques so that it takes less time to recovery. This is essentially the standard of care.

American Academy of Orthopedic Surgeons say this about minimally invasive knee replacement surgery on their website :

Minimally invasive knee replacement accomplishes everything that a traditional knee replacement does, but through a smaller incision (4- to 6-inch incision compared with an 8- to 10-inch incision). With the smaller incision come the potential benefits of a shorter hospital stay, shorter recovery, and a better looking scar.

Although there is no question that an artificial knee can be implanted through a smaller incision, doctors still don’t know whether it can be done as well as with the traditional approach.

Outcomes
Several early studies of minimally invasive knee replacement surgery have shown some benefits compared with traditional knee replacement, such as less blood loss, shorter hospital stay, and better motion. Other studies have shown a higher rate of complications with minimally invasive knee surgery, including poorer positioning of the knee implants.

1. Alignment matters..let your surgeon make a big enough incision to do a good job.

2. If your alignment is off, no amount of knee replacement therapy can correct that.


Michelle, PT
Michelle, PT

Michelle Stiles called "the no nonsense" therapist, by her patients, created a company called Cowboy Up Recovery after recognizing the bankruptcy of the present medical model. Too many people regard conventional medical wisdom as gospel, ignoring the subversive influences of Big Pharma and Big Medicine. She believes, Americans in general are being trained from an early age to defer to experts in numerous areas of life and losing the impulses for self-responsibility and self-reliance in the process. Over-diagnosis and over-medicating has become endemic. While thankful for the best miracles of modern medicine, she encourages people of all persuasions to listen to their bodies and seek out answers to maintain not just an absence of disease but optimal health. Her advice is: Cowboy Up, no one cares more about your health than you do.

    2 replies to "Alignment and Your Knee Replacement"

    • John Bellis

      My wife in Western Australia had a prosthetic knee replacement nine years ago. She has never been able to walk without a stick or crutches ever since. After the operation and still in hospital I noticed that her foot was misaligned by at least seventy degrees to the left. I went to call over a nurse to investigate this and my wife burst into tears not wanting to go through the operation again. How did the medical profession not see this? So making the most stupid decision of my life, I relented but told my wife that she must see the doctor who operated on her ASAP. A few weeks later I took her to this surgeon’s practice but my wife insisted that she saw the doctor alone and so this surgeon got away with his botch-up because my wife is very non-assertive. I would have insisted on nothing less than a full leg scan from hip to toes to show this huge misalignment. Instead a scan only of the knee joint was done which revealed nothing. Over the next year or two my wife had another two scans done on her knee by two separate bone specialist professionals who both insisted that a full leg scan could not be done. Why? Covering up for a fellow professional? My wife came to accept the status quo and her ankle weakened considerably over the years due to the misalignment causing her to fall periodically without warning as her ankle gave way beneath her. Around a year and a half ago I contacted my local Member of Parliament about this matter to see why full leg scans or X-rays seem impossible to be done. My MP informed me that he could issue an order to force a medical centre to do a full leg scan on my wife. I told my wife. More tears and it appears that she has been conditioned to accept her fate and wants to bury her head in the sand and get on with life as it is. Should I just accept this?

      • Michelle, PT

        John,
        Sorry to hear what has happened with your wife. Many MD’s are loathe to criticize another MD and many do not want to be
        tasked with correcting another’s shoddy work because of the increased potential for poor outcomes. I’m assuming your wife has a duck foot
        when you say that the alignment is off by “seventy degrees” which is horrible if she had proper alignment prior to the surgery.
        This will of course cause strain and ultimately malalignment up and down the kinematic chain. Unfortunately there are no easy solutions
        as you know. I would try to find an older and experienced MD who might be willing and up for the challenge. As for the scans I can’t really imagine that
        the knee scan is normal- to have that amount of malalignment at the ankle it would seem that her patella would be shifted laterally.So even though the joint may be “stable”
        the mechanics are anything but normal. I hope that helps.

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