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Zachary P. Arntson, DO

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Orthopedic Surgery, Board Eligible Joint Replacement and Sports Medicine Fellowship

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Areas of Focus

Ankle Care
Elbow Care
Foot Care
Hand Care
Hip Care
Knee Care
Pediatric Care
Shoulder Care
Sports Medicine
Wrist Care

Practice Overview

Originally from Minnesota and born at Mercy Hospital in Coon Rapids, Dr. Arntson earned his undergraduate degree from Gustavus Adolphus College and medical degree from Des Moines University.  He then went on to complete his internship and orthopedic surgery residency at St. John Health System with Michigan State University. During residency he was selected as chief resident and awarded orthopedic surgery resident of the year.

After residency, he spent an additional 12 months of subspecialized training in Total Joint Replacement and Sports Medicine surgery.  He completed a fellowship at Triangle Orthopedic Associates in Durham, North Carolina. During this time he learned advanced techniques in Anterior Hip and Knee Replacements, including Revision Joint Replacements. In addition, Dr. Arntson received training in Sports Medicine procedures including Shoulder Replacement, Arthroscopy and ACL reconstruction.

Dr. Arntson is board eligible with the American Osteopathic Board of Orthopedic Surgery. He is a member of the American Academy of Orthopedic Surgeons, American Osteopathic Academy of Orthopedics, and American Association of Hip and Knee Surgeons.

Dr. Arntson has published a research article titled “Topical vs. Intravenous Tranexamic Acid Use in Total Knee Arthroplasty,” which was presented at the International Congress for Joint Reconstruction Conference.

Dr. Arntson’s approach to patient care focuses on the individual needs of each patient. His specialized training, along with his general orthopedic knowledge, allows him to assess the best non-operative and operative options for each patient’s condition. Dr. Arntson has a strong interest in minimally invasive and muscle-sparing procedures coupled with multi-modal pain management protocols to decrease patient’s pain and speed recovery.

Dr. Arntson is married and resides in St. Paul with his wife and three daughters. In his free time, he enjoys fishing, golfing and spending time with his family.

Clinical Interest

Hip Care, including Muscle-sparing Anterior Approach Hip Replacement, Hip Replacement Revision, Tendonitis, Bursitis, and Hip Fractures

Knee Care, including Minimally Invasive Total Knee Replacement (also Patient Specific Joint Replacement and Robotic Surgery), Minimally Invasive Partial Knee Replacement, and Knee Replacement Revision

Shoulder Care, including Anatomic and Reverse Shoulder Joint Replacement and Shoulder Replacement Revision and Fractures

Sports Medicine, including Shoulder Arthroscopy, Rotator Cuff Repair, Shoulder Instability, Biceps Tenodesis or Tenotomy, Frozen Shoulder, Impingement, Labral Repair, Subacromial Decompression, Knee Arthroscpy with ACL Reconstruction, and Meniscus Surgery

Ankle Care, including Achilles Tendon Ruptures and Fracture Care

Elbow Care, including Bicep and Tricep Ruptures, Ulnar Nerve Decompression/Transposition, and Fracture Care

Hand Care, including Carpal Tunnel Release, DeQuervain’s Release, Trigger Finger Release, Arthritis, and Fracture Care

Wrist Care, including Fracture Care, Carpal Tunnel Release, and DeQuervain’s Release


Board Eligible, American Osteopathic Academy of Orthopedics

Joint Replacement and Sports Medicine, Triangle Orthopedic Associates, Durham, NC

Michigan State University: St. John Providence Health System, East Lansing, MI

Medical Degree
Des Moines University College of Osteopathic Medicine, Des Moines, IA

Hospital & Surgery Center Affiliations

Mercy and Unity Hospitals
Minnesota Orthopaedic Surgery Center
North Memorial Ambulatory Surgery Center at Maple Grove

Professional Affiliations

American Academy of Orthopedic Surgeons (AAOS)
American Osteopathic Association of Orthopedics (AOAO)
American Osteopathic Association (AOA)
American Association of Hip and Knee Surgeons (AAHKS)


Kristin V.
Care Coordinator

Patient Testimonials

November 30, 2017

Roberta E.

Dr. Arntson’s Checklist:
Listens – CHECK
Does Not Judge – CHECK
Knowledge – CHECK
Provides Options (when appropriate) – CHECK
Straight Forward – CHECK
Compassionate/Cares About His Patients – CHECK, CHECK, CHECK

Above is just a short list of reasons I would recommend Dr. Arntson to anyone struggling with making that all important decision to move ahead with joint replacement. At age 48, I had my first total knee replacement by another reputable surgeon (now retired) with Twin Cities Orthopedics.  Based on the success of that replacement, 5 years later I knew I needed the other knee replaced. Sticking with TCO, I had my left knee replaced in November 2015.  6-months post-op my knee just didn’t feel right so I continued with visits to my doctor until finally at the 1-year post-op mark I went in for arthroscopy, resulting in the removal of minimal scar tissue.  Still not confident things were right, my doctor offered to scope again, but made the recommendation I see Dr. Arntson for a 2nd opinion.

My initial consult with Dr. Arntson resulted in his giving 100% to listening to me share my issues of both knees and replacement history. Following a line of questioning, checking the stability, etc., of my problem knee he informed me that with everything described and done to that point it was a “red flag” that the new joint of less than 2 years needed to be replaced. Needless to say I was shocked, and disappointed. Options were provided and all tried (lab work to rule out infection, injection, another scope). After all was said and done, and the shock of a revised replacement wore off, I knew what needed to be done and felt very prepared to go through another replacement; more importantly, I was very confident that Dr. Arntson was going to make this revision a success.

In early October 2017, the revision went ahead at Mercy Hospital. Unlike any other past surgeon, Dr. Arntson visited me each day I was in the hospital to ensure all was going well, changed the dressing and provided me information about the procedure itself. My first day of therapy in the hospital amazed both myself & my therapists. I made more progress in the first few days than expected and certainly far sooner than in the past! After 2-3 weeks I was experiencing some rather severe calf pain so Dr. Arntson ordered a scan to rule out a blood clot, which thankfully turned out negative. He called me at home with the results, as well as followed back around with another phone call a few days later to see how I was doing. I am now at week 5 post-op and doing very well.  Without a doubt, this “Rolls Royce” of new knees is going to get me back to my bowling average in no time at all. Thank you to Dr. Arntson, his surgical team and Mercy Hospital staff!

It would be remiss of me if I didn’t also give kudos to Kristen V., Dr. Arntson’s patient care coordinator!  Kristen, as a supervisor in a different line of medical profession, I know just how tough some days can be.  I truly appreciate all of the help you provided me before, during and after my surgery.

July 31, 2017

Greg G.

 Let’s hear it now, three cheers for Dr. Zachary Arntson and Twin Cities Orthopedics (TCO) – HIP HIP Hooray, HIP HIP Hooray, HIP HIP Hooray!

I first met Dr. Arntson on June 14, 2017. He walked into the room and began his initial exam, asking questions and listening to my answers. I sensed a feeling of confidence in this young doctor that was tempered with an abundance of humility. I knew he understood the pain I was in, and he quickly put the steps in motion for a total hip replacement. He explained the surgical procedure (direct anterior approach) and its associated risks while reassuring me at the same time that I would be in good hands. I left the clinic that day feeling like there was finally a light at the end of the pain tunnel.

My surgery was scheduled for July 10th at Mercy Hospital in Coon Rapids, MN. I was in the pre-surgery room waiting for Dr. Arntson to arrive for a last minute check in when he walked in to sign my right hip. We chatted about his recent vacation (my wife and I had been to the same place a few months before) and then it was time to head for the operating room.

The rest, as they say, is history. True to his word, I was up walking the halls WITH NO BONE ON BONE HIP PAIN that afternoon! I was discharged the next day and have continued to improve. This procedure is the best – no follow up physical therapy other than walking everyday and doing the exercises sent home by the physical therapist.

I can’t say enough about the staff at the TCO Fridley clinic.  Courteous, friendly and professional, there was hardly any wait time for appointments. As for Dr. Arntson, his sly smile is disarming and his sense of humor immediately puts you at ease. His calm and quiet confidence is surpassed only by his humility. He has been blessed with excellent surgical skills which he uses to serve others. If you need a hip replacement, this is the guy you want on your side.

Thank you, Dr. Arntson, for making the quality of my life better.

July 19, 2017

RoseAnn B.

I have had problems with my knees for 15+ years. I had a torn meniscus, acl, mcl and a lot of arthritis. Dr. Bocklage and Dr. Kraft have both done surgeries on me. I called to make an appointment with Dr. Kraft but he had retired. The nurse suggested Dr. Arntson. When I first met him he was very nice and helpful. He explained all the options to my husband and myself and answered all my questions. I decided on a knee replacement. I have heard many horror stories about the pain and it didn’t work and so on, but I felt very confident with Dr. Arntson and he reassured me that everything would be fine and I would be well taken care of. I felt very calm going into surgery and knew that he would do a great job.. He talked to my husband after surgery and said everything went well. From the time I was in recovery throughout my hospital stay (3days ) I had very little pain. The nurses at Mercy were very nice and were always there when I needed them. Dr Arnston came on the second day and removed the bandages. I was really shocked because it looked so good. Lots of swelling and pretty colors but the incision looked great. He did a great job.
Dr. Arntson and his staff have all be wonderful. He is an amazing surgeon, very kind and caring. I would recommend him to everyone 100% I would also like to mention the physical therapist at Mercy. Denise is great and my two outpatient therapists, Seth and Jared. They push me to do what I need to get better. I am doing great and with a little more time I’ll be walking and hiking the way I use to.

June 22, 2017

Kathy A.

I am a 52 yr. old who suffered a meniscus tear on my right knee while working out. I just had knee artroscopy surgery and am extremely pleased with the results. I was able to bear weight on my leg immediately. I had minimal to no pain. I was back to walking around lake Calhoun within days. I recommend Dr. Arntson very highly.

June 8, 2017

Kenneth P.

Kenneth shows his progress four hours after anterior total hip replacement surgery from Dr. Zachary Arntson.   To view, click here.

May 30, 2017

Wanda P.

Dr. Arntson performed anterior total hip replacement on my left hip at the end of March. I was amazed at how well I felt when I was able to walk on it only several hours after surgery (with the aid of a walker). I went home the next day. The PT at home was “walk, walk, walk,” and that’s exactly what I did. In less than a week I was using a cane to help get around. I had no pain in that hip the entire time. At my two week checkup Dr. Arntson told me that I could move my leg in any direction I wished, including crossing my legs. Something I wasn’t expecting to be able to do for another month or two. I was amazed at how there were no restrictions after two weeks. Walking, stairs, stationary bike, etc. only limited to my tolerance for any activity. That made a difference in healing. My recovery time was so much less than I thought it would be.

Dr. Arntson is very kind and caring. I had other health issues of which he was very accommodating, making sure I would be as comfortable as possible. I appreciated that very much. Sometimes it’s the little things that help make the big things not seem so frightening. I had no fears going into surgery, I felt I was in great hands, and I was. He is a considerate and compassionate person. His concern is sincere. He listened to all of my questions and respectfully provided me with answers to each one. He has a great beside manner and a wonderful sense of humor.

Words can not express how much I appreciated such a kind, caring, compassionate, skilled and experienced surgeon. My experience was remarkable and the care I received exceeded my expectations. I highly recommend Dr. Arntson.

Oh, the places I can go and the things I can do!

May 27, 2017

Valerie Z.

I was kicked by a horse on February 14th and ended up with a tibial plateau fracture. I could have opted to “fix” that or have a knee replacement, Dr Arntson was very informative about the pros and cons of my options and i scheduled a minimally invasive knee replacement with him on March 21st. I was insistent on the best care as I was determined to be back riding horse again for the spring, summer and fall season. I was not disappointed. The surgery and the therapy all went well. I drove myself to my first physical therapy session (this was a right knee replacement) one day short of four weeks after my surgery. This is not recommended but my ride to therapy fell through. I was able to quit the prescription pain medication less than 2 weeks after surgery and soon after that quit taking the Tylenol. The first week in May I was able to ride horse for the first time since getting kicked, I quit wearing the TED stockings and pretty much resumed my normal schedule with no residual pain and no limp whatsoever. I still have a long way to go to build my stamina/endurance back up again as I was pretty much non-weight bearing on my right leg between getting kicked and the surgery but i couldn’t be happier with my progress and my results. I have a shoulder that needs attention also and I already warned Dr.Arntson that I will be making an appointment with him once horse riding season in MN is coming to an end this year.

May 22, 2017

Dee Ann C.

Trust is the glue of life. Dr. Arntson’s had a distinct ability to calmly and professionally answer my questions about my anterior hip replacement, hospitalization and rehabilitation. This was my third attempt to find a surgeon that I trusted. This trust carried through the pre-surgery questions, my family’s post-surgery meeting and my follow up surgical appointments. I not only trust Dr. Arnston’s words, I trust his actions. I have had a much quicker rehabilitation than my former hip surgery. Such professionalism is an art. As such, Dr. Arntson is an artist I unqualifiedly endorse.

May 3, 2017

Thomas S.

I have had a very good experience under Dr. Arntson and his team !
All aspects from preoperative to after surgery of my rotator cuff was wonderful
I had this surgery performed 30 years ago and extensive surgery which was much more painful recovery being non-arthroscopic
Every detail has been covered
My surgery went very well and recovery time has been much faster than I ever expected.
I just want to thank him and the team for such great job.

April 6, 2017

Jeannette C.

On November 14, 2014, in Wausau WI, I had a Total Left Knee Replacement, at the age of 63. On December 26, 2014, I was going down stairs to our lower level, and my left foot slipped on the 2nd to last stair, hit the floor hard, but I did not fall. I immediately had extreme pain in my left knee area. My doctor was on vacation and I was 5 weeks into my PT for my knee replacement. When PT examined my knee they were pretty sure I had torn my Quad Muscle , since I could no longer lift my leg. My surgeon confirmed, this and I had surgery on January 13, 2015 to repair my Quad. We moved to Elk River MN in July of 2015. Of course that meant finding all new doctors. We heard great things about Dr. Nathan Norquist and I met with him and knew right away, he was the doctor I was looking for. I was not feeling well at all. I had lost a lot of wait and my left knee/quad area was causing me pain. He referred me to Twin Cities Orthopedics and gave me names of two doctors that he felt could help me. One of those was Dr.Kruse. I met with him and I saw him a couple of times. He said he would like me to see another TCO doctor at another location. I saw this doctor a number of times and he thought it was my Quad Muscle that was not fully healed or strained. He put me back in a brace so I could rest it, and I was eventually released with the thought that the problem was the Quad Muscle. In December 2016, I went back to Dr. Kruse, and he asked me how my knee was doing, and I told him not good. He remembered that he had referred me to another doctor, so he asked his assistant to pull up all the records of what had been done. I told him I was so frustrated, because everyone was pointing to the Quad as the problem, but it was the knee that was causing the problem. My left knee was extremely warmer than my right, and any time I would walk or do really anything, my knee would turn red. Also, it felt like my knee was filled with Arthritis. As I would walk, it would just stiffen up more and more. It felt like I could feel the parts in my artificial knee bend with each step I took. Dr. Kruse, after examining me, told me I was right, and there was something wrong. The first thing he did was check to see if I had an infection in the knee. That came back negative. The next thing he wanted to check was to see if I was allergic to any of the metals in my knee. I told him that I would buy costume jewelry, and I had no problems with it. But, I did remember that way back in high school, my class ring did give me problems. Well the test came back saying I was Highly Reactive to Nickel and Mildly Reactive to Aluminum. I knew immediately that I wanted that knee taken out, and replaced with a new knee, minus the Nickel and Aluminum! Dr. Kruse referred me to Dr. Arntson for my total knee replacement / revision. I will never be able to thank Dr. Kruse enough, for taking the time and steps he did, in finding out what was really wrong with my knee replacement! I also want to thank him for referring me to Dr. Arntson. My total knee replacement / revision went so well. I walked out of the hospital and just used one crutch, when I went out of the house, for the first two weeks. After that I did not need it at all. I was released from PT at the end of 5 weeks and I could bend my knee to 138 and straighten in to 0. Thank you Dr. Arntson! I also feel so much better health wise. I had changes/symptoms to my body happen, after my first knee replacement, but I never related them to the knee. After, my revision they went away. Also, I wish I could have had the test to see, if I was allergic to any metals, before I had my first knee replacement. It would have saved me from years of pain and a knee revision after only 2 years and 3 months. Now, I am looking forward to enjoying the summer walking and riding my bike!

March 20, 2017

Anisa T.

When I sought out a 3rd opinion on my left knee, I was scheduled with Dr. Arntson.  My first appointment was very cordial and I remember leaving the office that day feeling very optimistic about my potential treatment.  He ordered several tests, which is the first time a doctor has listened to me and not looked at me like my pain is all in my head.  I’ve been in pain since 2012, had meniscus repaired, didn’t hold.  Had partial, didn’t work for me. 


Fast forward to after all the testing was complete, Dr. Arntson took the time to fully answer any and all questions about a total knee replacement, which he recommended.  I started to feel very much at ease with my new Doctor – who then ruled out everything from the testing.  So after the Holidays in 2016, I knew I had to make the appointment to get my surgery done. 


Long story short; I had my total knee replacement revision on January 31st 2017 at Mercy Hospital, done by the amazing Dr. Arntson.  From the morning I got to the hospital, to recovery, to my hospital stay, to home, I was well taken care of.  And now 6 weeks out I am walking without pain!   

Having my total knee replacement was the best thing I could have ever done for myself to get rid of the constant pain I was in.  Dr. Arntson is literally an Angel.  He has made my life better and I can now look forward to the rest of my life pain free!!  I highly recommend Dr. Arntson and his staff. 

March 13, 2017

JoAnne J.

I had a surgery with Dr. Arntson to repair a torn meniscus. Dr. Arntson was very informative with options, thorough with imaging and always took the time to listen and answer questions. Due to other medical reasons, I’ve had 12 surgeries over the past 8 years. This was my first surgery with Dr. Arntson. He was on time for the surgery, explained the procedure to myself and my husband and answered all our questions.  He met with my husband after surgery, showed pictures of the procedure, explaining each one.  I was extremely impressed when the bandages came off to barely see a trace of where the procedure took place.  Recovery time was minimal.  It was so refreshing to meet a doctor who truly put the patient first!

March 9, 2017

Steve W.

Steve shows his progress four hours after anterior total hip replacement surgery from Dr. Zachary Arntson.  To view, click here.

March 3, 2017

James T.

This is the 3rd total knee replacement revision in 10 years.  The first two revisions were done by other physicians.  Dr.Arntson performed the third revision and it is the best one yet. Dr.Arntson and his team were awesome. They seemed to care about me and this surgery more than any surgeries I had previously. I just want to thank Dr. Arntson for doing a great job and making me feel special.

March 1, 2017

Gary B.

Dr. Arntson performed a left anterior hip replacement on me.  His professional pre surgery advice and recommendation  left me with no questions. The surgery was completed with no complications. Dr. Arntson called me at home twice to check on my healing process.  I am now pain free and live with no restrictions as the result of the surgery.

January 15, 2017

Linda B.

As an avid golfer and pickleball player, I was experiencing knee join pain and was unable to enjoy the two sports I love.  I sought out an experienced (sports injuries) orthopedic doctor and located Dr. Arntson on the Twin Cities Orthopedics website and made an appointment with him.  After examining my knee, he initially suggested an MRI however, his second option was the use of a Reaction Knee Brace.  I’ve been wearing the brace now for three weeks particularly when I play Pickleball.  The brace has provided good support for those times when I move quickly on the court.  Thank you Dr. Arntson for your expertise with this issue.  I would highly recommend him to anyone who plays sports and would like to continue playing without pain.

December 11, 2016

Marjorie S.

I am a 66 year old, very active woman. I was referred to your practice group by my chiropractor who had experienced fabulous results at the TCO Southdale clinic after breaking her leg.

Dr. Arntson seemed like a good fit and had a clinic location near me, so I came to see him about my knee pain. I had previously been seen by three MDs, one of whom specializes in sports medicine, and one who is an orthopedic surgeon. All three were quite dismissive about my pain, and all told me that “it’s just arthritis, everyone gets it.” When asked what I could do, none of them offered any solution other than leg exercises, which hurt so much that I couldn’t do them.

Dr. Arntson gave me his undivided attention and it was clear that he took me very seriously. We discussed the different alternatives available (cortisone injections, gel injections and knee replacement) at length, and I fully understood the options. I opted to go with cortisone injections. He was very helpful in making sure that my insurance would cover the visits and the procedures, and I received the first injection in my right knee.

It seems to make an immediate difference, so I came back one week later for the injection in my left knee. His bedside manner, gentleness in prepping and injecting my knees was remarkable. I had absolutely no pain either time.

Unfortunately, the relief only lasted about 6 weeks, so I returned, and we decided to try the injections of gel. These have been very helpful, again, no pain upon injections, and increased flexibility and comfort in walking.

I know that Dr. Arntson believes that I will let him know if I need further treatment, and if so, we can assess my progress and discuss my options. I would happily recommend him and the entire staff at the clinic to anyone.


November 22, 2016

Clay D.

Dr. Arntson and staff have been Fantastic, the nursing staff ( Fridley, CR, Otsego) have been so kind and comforting through this tough surgery and recovery process, including the X-ray & MRI techs. Kristin, Dr. Arntson assistant has been so kind and helpful making sure I don’t miss any appts. I would highly recommend Dr. Arntson to anyone for ACL surgery he is very transparent and truly cares about his patients.

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