Nanoknee, is it better or merely hype?
Unfortunately, I have been diagnosed with arthritus in my left knee and told that it will eventually need a TKR. I have a friend who has had both knees replaced and heard horror stories about how painful it is. Searching the web I found a site (nanoknee.com) that claims that there knee replacement method is faster, better and less painful. Is this true? It seems that if it were better it would be used more often than titanium replacements. Supposedly it has been used for 10 years so there must be patients who have undergone it. Any advice would be helpful.
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@sheliae
Mostly but not entirely. My surgeon could tell from the x-rays that I appeared to have arthritic results in all three compartments BUT he said he would check once he opened me up and if he could do a partial instead, he would. He said he keeps a full complement of partial and full implants in the operating theater.
So it is possible that he would do a partial for me without knowing for sure before hand. But that should be part of the pre-surgery discussions with the surgeon.
If you really want the best, I would suggest coming to Phoenix to see my guy -- Jimmy Chow. He has an active travel practice. He is the primary inventor of the Superpath method of minimally invasive hip replacement and he did my left hip four years ago. I had no post surgery pain. My right knee failed a little over a year ago and he replaced my right knee. Once again, no pain post surgery.
The caveat on Dr. Chow is that he does not take insurance and has withdrawn from Medicare. I had to pay his fee directly to him but the rest was covered by my Medicare Advantage PPO plan. Amazingly, his fee is less than the Nano Knee fee.
I had constant but manageable pain in my right knee before surgery. But I was also severely misaligned (valgus) and if I stepped the wrong way an extremely sharp pain ran down my leg. Presumably a nerve impingement. I also had ankle pain and even went to a foot/ankle surgeon to confirm that it was referred pain from the knee.
I was not afraid of the surgery. What I was afraid of was general anesthesia. I confirmed that his regular practice was a spinal with a temporary nerve block but I also confirmed that when I met with the anesthetist before the surgery. I was his last surgery of the day (another story) and I was still home before dark.
Dr Chow did a mid vastus cut and did NOT use a tourniquet. He had initially determined from the MRI that my ACL and PCL were intact and strong and told me that it appeared that he could do a bicruciate retaining implant (BCR). In 99+% of all TKRs the ACL is removed and in a substantial portion the PCL is removed as well. in a BCR, the ligaments are retained and protected. But it is more complex surgery and very, very few do it. Dr. Chow is one of the very few who not only do it but does it regularly. There is even a video of him doing the exact procedure for an orthopedic innovations conference in 2020. Very few manufacturers of implants even have a BCR version. Dr. Chow did a BCR for me so post surgery I still have all my ligaments.
I have a bunch of criteria for a knee replacement surgeon. Dr. Chow satisfied all of them:
1) Uses a minimally invasive method -- subvastus or midvastus;
2) Does NOT use a tourniquet;
3) Uses a robot to assist him;
4) Does a Functional alignment to repair my misalignment. A kinematic or inverse kinematic alignment would have been acceptable but not the traditional mechanical alignment;
5) HAS EXTENSIVE EXPERIENCE DOING THE EXACT PROCEDURE THAT HE WOULD DO FOR ME;
5) Has great hands; and
6) Has a great mind.
I have been trying to figure out why my procedure went so well and others not so much even though they may have done much the same procedures. I have now tentatively concluded that the answer lies in #s 5 and 6 above. Images can give guidance and help the surgeon build a model implant but exactly where to cut and how much is still an art form. That is where great hands and a great mind come into play.
Before my surgery I told Dr. Chow that I wanted to be back on the golf course by the end of four weeks. He replied that it was an aggressive target but he was up to it if I was. I was. He was. On the 27th day after my surgery, I was playing golf.
I am an 81 YO male. I recently had my six month checkup with him. He told me I had no limitations. I asked if that meant I could go on trampolines with my grandkids; he said yes. I asked him if that meant I could run; he said if I wanted to.
See @sailnsun's comments experience reflected in this post in this forum:
https://connect.mayoclinic.org/discussion/3rd-knee-replacement-in-a-year-and-a-half-on-same-knee/
Good luck.
Steve
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3 Reactions@sheliae Yes they should. It is the informed consent discussion every surgeon must have with every patient before they go under the knife!
@steveinarizona It's sailnsun Steve. Thought I'd chime in with an update. I had my 6 week follow up with Dr. Chow yesterday (May 11). He's very pleased with my progress and says I'm way ahead of the game. I developed a stomach ulcer from all the NSAIDS (Ibuprofen or Meloxicam inflammatory meds). I'm not taking any pain medication now, so my inflammation is up and that's to be expected if not taking anything. My range of motion (ROM) fluctuates between 120 - 130 degrees, depending on what I did during the day. I always measure late afternoon. The amount of swelling will affect the ROM I'm able to achieve. Prior to surgery my ROM was 112, not enough to properly peddle a bike. I can easily peddle my bike now with not pain and no clunking feeling in my knee. The surgery was done on my right knee. I can now walk up stairs leading with my right and zero pain!
I had a TKR in Lithuania by a Professor Sarunas Tarasevicius. He was supposed to do a patella femoral replacement and did not. He wanted to do a TKR. I told him 3 surgeons in Alberta told me a TKR would not help me, that I needed a PFR. He pushed for a TKR and finally convinced my husband and I to go the TKR route, because he told us he would resurface my patella and showed us how it is done on his computer. He never touched my patella and now says that it is not standard practice in Europe to resurface the patella when performing a TKR.
I'm thankful that I posted my story on this website and Steve saw it, because Steve directed me to Dr. Jimmy Chow and I am so grateful. While I still have stiffness and soreness, I'm early in the healing process. In another 6 weeks, I expect to be 100% pain and swelling free and have an ROM of 130.
Dr. Chow is a rare doctor, that will go in and fix the errors of other surgeons. He reshaped my patella, then burned off all the scar tissue using radiation. He lined my patella with a newborn's umbilical cord as it is strong, lubricant and would aid in preventing too much scar tissue from forming. He replaced the plastic femoral part of the knee implant with a larger metal one. The plastic was 10 mm in size and the metal was 12 mm. This has stopped the clunking I was feeling when I peddled a bike or came downstairs. After surgery, Dr. Chow came to talk to my husband and I. He said the amount of scar tissue he removed was larger than the size of his hand. No wonder I couldn't achieve a good ROM before.
A couple of months prior to surgery, Dr. Chow spoked to me on the phone and gave me one exercise he wanted me to do 3 times a day. I followed his instructions. It strengthened my quad.
After the surgery they applied an Inkwell tattoo on my leg on side of my knee. I take 3 photos daily. I put a black sticker in place (noted by the tattoo) and it measures the temperature of my leg and percentage of swelling. The next photo measures my ability to straighten my leg. It's perfectly straight. The 3rd photo is one where I bend my knee as much as I can and it will measure the ROM. It is very accurate as one day I was at my physiotherapists and he measured my ROM to be 126 degrees. The Inkwell tattoo measured it to be 125 a few hours later.
After my TKR, I was walking around with one crutch like cane and by afternoon, if I had been on my feet too long, then every step became painful. I could barely make it up the stairs it hurt so much.
So, thank you Steve for directing me to Dr. Chow, as he really is an awesome surgeon! I expect my life to be back to normal by June, which is what he expects as well.
The other thing I should mention, when we spoke yesterday he said we would have another follow up appointment in 6 months and then another follow up appointment in 2 yrs. I didn't have to worry about calling them for that as his office staff will put it in their calendar and they will contact me in advance. That's amazing. I've never had a surgeon care about having a follow up appointment in 6 months, let alone in 2 years!
He is so amicable and easy to talk to. But best of all, he is an amazing surgeon. Brilliant and talented hands. He wants to do the best job in can.
I thought what is this going to cost me? As it is well known that surgeries in the US can cost tens of thousands of dollars. His fee was under $8K. The highest cost was the hospital, which was just under $18K. It would have cost me that much to go to a private clinic in Canada! But, 1) no surgeon in Canada would touch me, because I had my TKR done in Lithuania ; 2) no surgeon in Canada would have done the procedure that Dr. Chow performed. I told my Sports doctor what was going to be done and he had never heard of that being done before. He was once the head physician for the Calgary Flames, so I think over the span of his career he's witnessed alot.
I'm very grateful to Dr. Chow. I'm 66 and wasn't ready to be immobile for the rest of my life. I want to play and chase after our 2 year old granddaughter. Cycle, travel and hike! This has all been on hold for me for the past 4 years. Our first meeting with Dr. Chow he asked me what I wanted to be able to do again, that I can't do now. All those things. I told him and accident downhill skiing was what started all this. He said I could ski again. I don't want to. I don't want to risk another such accident. This one cost me 4 yrs of my life.
Oh, I also want to mention my scar. So, after my TKR in Lithuania, I had a 6"-7" scar and it was about 1/16 to 1/8 inch wide. Dr. Chow followed that scar line precisely. My scar now is a pencil line thin and is practically invisible in some spots. It might all turn invisible over time. I couldn't be more pleased!
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2 ReactionsI am glad you are so happy with the results. When I discussed with him before my surgery the type of method he would use he said it was mid vastus. He explained that subvastus would be slightly less painful but mid vastus gave him a better field of work and if a revision were necessary, a pathway for that revision. It appears from your post that he was able to fix your scar. He also did a plastic surgery close for me.
You are right that he is very approachable. I just had my six month review with him (Dr. Chow, not his PA) and he told me I had no limitations. I asked if that meant I could go on trampolines with my grandkids; he said yes. I asked if that meant I could run; he said if I wanted to.
I had to wait a bit for my surgery not only to get on his calendar but his calendar was frozen for a bit as he was recovering from rotator cuff surgery caused by a skateboarding accident. That is my kind of surgeon. I asked him who his surgeon was and he told me. One of my golfing partner's wife is having shoulder surgery on Thursday from the same surgeon who did Dr. Chow. I believe that asking physicians who they and their immediate family use is a great method to identify great doctors.
One warning for others. Dr. Chow has withdrawn from Medicare and does not generally take insurance. I am on a Medicare Advantage PPO plan (probably one of the best such plans) and the rest of the cost of the procedure was covered by my insurance; just not his fee.
I have been trying to figure out why he is so good when others do similar procedures and their patients have pain. I think it comes down to great hands and a great mind. Once the surgeon opens up the knee he has to make the tibia and femur cuts to hold the implant and resurface the patella and move it out of the way. I suspect there is artistry in exactly how that is accomplished. The patient problem is how does one find out which surgeon has great hands and a great mind. I have no answer for that other than inferring it from what you can gather.
I have a friend who is scheduled to have a "Jiffy Knee" done in Scottsdale. I was curious and one day when I was chatting with Dr. Chow I mentioned it and asked him what he thought. He replied that it depended on the skill of the surgeon. I told him the name (Timothy Kavanaugh) and Dr. Chow said he has seen no problems from that surgeon's work. That is a compliment as Dr. Chow spends about 20% of his surgical time doing revisions of other surgeons' work. A great surgeon is not afraid to praise another.
I am very happy that you have had such a great outcome.
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1 Reaction@steveinarizona Thanks very much for your posts, very informative and helpful for us still considering surgical (and non surgical) options to TKR. Dr Chow sounds wonderful!
@sailnsun, thank you for taking the time to write your post, similar to steveinarisona’s post, your story and detailed explanation is very informative. 🙏
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1 Reaction@steveinarizona, would you be able to share Dr. Chow’ contact information, I would be interested to follow up with him. Thank you 🙏
@catheem The nerve block was amazing and controlled the pain for over 50 hours.
Later swelling has woken me in the night. Use compression with ice in Cure squad. Using only 2 tylenol arthritis 650 mg for pain. No hydromorph.
Walking 30 minute intervals with 2 canes. Better than walker for me. Walk in the house with nothing and climb 2 sets of stairs with no pain.
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1 Reaction@macduff
https://www.chowhipandknee.com/
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1 ReactionActually , I was almost 77. Yes , I am active & when my Surgeon assured me that I should be able to travel 2 months afterwards My surgery was April 4, 2025 & I was on the Plane June 4, 2025. I wore compression hose on the plane...I always do on a long flight. I actually did too much & had some swelling the first few days...but I was still able to do everything!