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Qualifications and Experience
Awards and Publications
A graduate of the United States Military Academy at West Point, Dr. Xenos earned his medical degree from the Georgetown University School of Medicine in Washington, D.C. He completed his residency in orthopaedic surgery at Walter Reed Army Medical Center in Washington, D.C. He then served as the Chief of Orthopaedic Surgery at Fort Benning Georgia where he was directly involved in the treatment of the 75th Ranger Regiment as well as other infantry units. Dr. Xenos followed his passion for joint replacement and completed a fellowship in adult reconstructive surgery at the Anderson Orthopaedic Research Institute in Virginia. He then returned to Walter Reed as the Director of Adult Reconstruction, where he attained the rank of Lieutenant
Colonel, U.S. Army Medical Corps. Dr. Xenos currently remains active on the American Board of Orthopaedic Surgery as well as other national professional organizations.
Dr Xenos’ clinical interests include hip, knee and shoulder replacement as well as arthroscopic surgery of the hip. His research interests include biomechanical testing, clinical studies in hip and knee replacement, patient activity levels after joint replacement, diagnosis and treatment outcomes of hip labral pathology and femoral acetabular impingement. Dr. Xenos has presented his research at both national and international venues. His research has also resulted in numerous publications in such journals as the Journal of Bone and Joint Surgery and has earned several awards including the prestigious Founders Award presented by the Eastern Orthopaedic Association.
Dr Xenos enjoys skiing, camping, bicycling and is an avid fly fisherman.
Verified Patient Reviews
Dr. Xenos did a total hip replacement for me one year ago. He was fantastic through the entire process. The hip replacement was a total success and at the one-year mark, I could not be more pleased. I am back to being active again with no pain. Dr. Xenos is the most caring physician I have ever been to. I highly recommend Dr. Xenos.
I called in the morning and was able to get a same day appointment. This was partailly luck and probably my referral with the results of an awful MRI had something to do with it. Yes, there was a wait but he was so apologetic that I knew it was because of the time he spent with each patient. He didn't rush and answered questions thoroughly. I feel very comfortable that I chose the right doctor for my total knee replacement! Cheri P.
Very knowledgable and easy to talk to and follow.
Dr. Xenos and his staff treated me professionally and respectfully as he explained in detail the procedure in which I was about to experience. He made sure that I understood what to expect.
Always enjoy the Dr's smile. Very professional and always leave him feeling he listened to me about what I was experiencing.
They were extremely loaded with patients that day, though I was still taken care of, i.e. x-rays, etc. Several staff had jumped in to try to make the wait time less. They do have a nice array of hot drinks and things available, which was nice in the waiting room. Once in with different staff, I was cared for with diligence, good information, and kindness.
I think he is a very efficient and caring person.
I walked in without a appointment and he gladly seen me He also fixed my problem. I have been a patient for 10 plus years and feel like a family member.
The best hip or knee replacement doc in Colorado!
This was not my first visit to Dr. Xenos as he has replaced my left hip in the past. I believe him to be an extremely gifted surgeon and a very caring and compassionate man. I have recommended him to others and will continue to do so.
Highly recommended, Very personable. I was expecting to be told I need a knee replacement (turning 50 and blown ACL and torn meniscus) I like the sounds of the results of a knee replacement but don't like the sounds of the invasive surgery it takes. Dr. recommended that being healthy enough to get an ACL and repair meniscus and save total knee replacement for down the road if needed. Very happy with explanation of procedure and techniques used.
All the personnel were so nice. I was in and our with a diagnosis quickly. He did say he would set me up with a nerve specialist and I have not heard back from him.
Excellent doc with a great bedside manner and friendly staff. I highly recommend him.
He was great! So was his PA! I highly recommend Dr Demos.
He is worth the wait. He performed surgery on my left knee and recently surgery on my husband's right knee. I was very concerned since my husband is almost 77 and his first knee surgery by a different dr. was not very good. The difference of day and night, we are extremely pleased; surgery on 12/20/2015 scar is like a small red line, he has been able to walk without any aids one month after his surgery. It has been six weeks and no longer requires therapy because he is able to use his leg with full range of motion.
Great Experience throughout the visit. Reception, Asst PA and Dr Xenos were truly professional. Dr. Xenos and his PA listened and approached my pain region very carefully and took the necessary time to explain everything. When their recommendations for improvement were offered and explained, my anxiety were reduced and my hopes for improvement gained tremendously. Thank you Dr Xenos and your PA.
Dr John Xenos is a real professional that takes the time for his patients. First class manners and straight forward approach. He really cares about you getting better as quickly as is possible. Thanks
He's just so awesome. Wish all docs could be like him. We'd all be happy people if medical pros could replicate everything about him!
Very personable. Makes you feel very comfortable, like you have known him for a long time.
It has always been enjoying .He is fun to talk to.Takes his time with you. When someone asks about him I say go he is great.
I had endured knee pain (bone on bone) for quite a while before visiting Dr. Xenos. He reviewed my x-rays and highly recommended a total knee replacement. I have to admit that I was very nervous initially (due to a scary surgical experience with a different ortho doctor several years before, an addiction to Internet horror stories, and an overactive imagination), but Dr. Xenos, Charlie and Steve (the PA's) answered my numerous questions patiently, and continually reassured me (without making me feel bad!) right up until time for my surgery. After my surgery, I was amazed that I was able to get out of bed, after all the anesthesia wore off, and with the help of the nurses, walk to the bathroom. I used a walker during my stay in the hospital, but actually walked out of the hospital with just my cane, which I used at home for the first couple of days. My recovery went very well with much less pain that I anticipated! By 2 weeks out, I was off all of the pain medication, except for Ibuprophen and Tylenol. I am now 6 weeks out (my 6-week follow-up was today!), and unless I REALLY overdo it, am almost completely pain-free! Maybe, I was in more pain than I was willing to acknowledge prior to my surgery, but I am seriously amazed and thrilled with how fast and how well my recovery has gone. Overall, my experience was so much better than I ever thought possible! I received exemplary care from Dr. Xenos, my anesthesiologist (Dr. Justin Smith), and all of my nurses at Sky Ridge! So, bottom line, based on my experience, I would highly recommend Dr. Xenos and his staff! I am truly grateful for his expertise!
All went well except for the wait time. Staff was friendly , professional and helpful. Was especially impressed with Dr Xenos.
Very approachable, very clear with options and extremely professional. Addressed all of my questions, concerns & was great from 1st visit to post op. Would highly recommend.
Dr. Xenos has a great bedside manner, is very informative and spent as much time as was needed to answer my questions. His whole office staff was great. They are all a good team. Sue P
Thank you for the professional and kind explanations of the procedure and of my condition. I am much less apprehensive about the surgery than I was before the appointment. Dr. Xenos and the staff were all very positive and assuring as they explained all that the surgery and recovery would take. Thank you.
He was terrific.
It was good , he answered all questions and I forgot to ask a few more..
You may have a wait some days but it 's well worth it! When it's your time you get all the time and attention you need!
Dr. Xenos is a straight shooter. I appreciate people that relate to others in a positive truthful manner. He is a true encouragement to the feild. Thanks
My appointment was on time as scheduled. All office staff, PA and doctor were courteous, informative and thorough. I appreciate their effort to get scheduled with a facility approved by my insurance carrier.
Awesome Doctor! Dr Zenos gave me back my life with 2 knee replacements. He is the most caring Doctor and just makes you feel like you are special. Steve is a great guy also. He listens to your concerns and encourages you through the recovery process.
I absolutely love Dr. Xenos and his staff! I've never had an injury that required surgery before so I was a little nervous about this whole process. Dr. Xenos made me so incredibly comfortable and confident every step of the way. He has the best personality and is so down to earth. Right away I could tell he LOVES what he does and working with his patient which make me feel at ease. I couldn't be happier with my decision to see Dr. Xenos and his PA. I would recommend and trust Dr. Xenos and his staff with any one of my family members and/or friends. Stop searching for the best orthopedic doctor in Lone Tree because Dr. Xenos is it.
I have been in pain ever since my full hip replacement 4/20/2015. Dr. Xenos ordered Blood work role out infection and a MRI. I was not given, any results from the blood tests from his office. My PCP called me, Dr. Xenos was not available, for my MRI follow up appointment, I saw his PA Charlie, but he had little information to share. He recommended I make another appointment to see Dr. Xenos.
Dr. Xenos is an amazing surgeon! He repaired a Right ankle fracture (actually 3 fractures) on this 71 year old woman! He is the sweetest, most compassionate and caring doctor! I absolutely LOVE Dr. Xenos! He gave me a big hug when he saw me today. He is very funny and personable, which is outside the norm for some surgeons (some are just so serious!). He loves to tease me, and I get a real kick out of it! This gal can honestly say that she looks forward to seeing Dr. Xenos for her follow up appointments because I know that appointment will certainly make my day!
Immediately put me at ease! Very professional and honest! Would highly reccomend!
Dr. Xenos is amazing! I absolutely love his care! He has a fantastic sense of humor. He is very thorough and gentle. I highly recommend Dr. Xenos!!!
I fully trust him with my physical well being. his whole staff was awesome I couldn't ask for any better description of the upcoming procedure. the only question I forgot to ask was, how's the food? dave b.
Dr. Xenos was friendly and easy to talk with. I had a few questions about my upcoming surgery, and he answered my questions thoroughly. I felt comfortable around him, which is important when he will be your surgeon. My gripe is only with the wait time. I waited an hour past my appointment time, and had to change from one exam room to another during that wait. I don't mind waiting for the great service i've received, but a quick update or explanation during the wait would have gone a long way in making me feel valued as a patient.
Dr. Xenos is a professional of the highest caliber. He performs excellent replacement joints, is a perfectionist, and his surgeries turn out perfect. When diagnosed for a knee replacement, he took time to inform me what would be done, how it would be done and what to expect for recovery. I could not expect anymore personal treatment from any physician. When describing his personality, he is very caring, has a sense of humor and shows humility. I recommend him for any surgery without reservation. He is the best in the Colorado/Wyoming area.
Absolutely PERSONAL attention. Much better than some of the large corporate offices I have been to. Got my treatment all scheduled and well explained. I know exactly what to expect. Paula B
He is such a nice doctor. I loved the vibes I got from his staff and from him.
such amazing staff. Dr Xenos was a joy to meet and talk with. thank yo so much for the start of a great process of healing and restoration! I want to personally thank Dr. Xenos for allowing me in to see him. Blessing sir.
The visit was good, but I waited way too long from the time I checked in until I was seen by the doctor
He was great and truly attentive with my issues. I like his direct approach in dealing with the issues at hand. I like the fact the he too served our country.
I have always trusted his professionalism and his open truthful manner. He makes you feel completely at ease and takes great care. To care for you. I would highly recommend him. And respect his bedside manner immensely.
The visit for my up coming knee replacement was professional, informative and everything was explained to me. I know what to expect during and after the surgery. Dr. John Xenos is very down to earth and answered all my questions to my satisfaction. I would recommend to my family and friends.
After my successful total knee replacement in 2012, I see Doctor Xenos annually for routine follow-up exams. This exam was thorough and efficient with his staff taking appropriate X-rays and assisting with my questions. The receptionist, PA and x-ray technician were extremely helpful, professional and attentive. Doctor Xenos consistently provides clear explanations, coupled with a comforting sense of compassion for patients in recovery, and a respectful partnership with his staff. Several members of the hospital staff - separate from his practice - voluntarily expressed their great respect for his professional excellence, high standards, and their pleasure in working with him.
Dr. Xenos is one of those rare physicians with superb bedside manner as well as incredible talent in the OR. Dr. Xenos is down to earth, a wonderful communicator, & a tremendous surgeon!! He did scope on my right hip and we are about to do the left hip. I highly recommend Dr. Xenos for any of your orthopedic needs.
Dr. Xenos and his staff are very professional and I REALLY appreciated that they were able to fit me in much earlier then originally scheduled.
In that he is planned to operate on me in a week the visit was both very informative and reassuring. Everyone in his office was very friendly and helpful.
Bedside manner is excellent. Very thorough and explains everything step by step. Makes one feel very comfortable discussing ones concerns
Dr. Xenos and his staff spent so much time with me, I was amazed. They are so thorough, friendly, caring, smart.... I couldn't ask for more.
Very professional doctor. He listens to the patient and actually addresses the concerns we had. He is willing to refer out if he feels another doctor can better answer questions.
Am so thrilled with my knees. Dr. Xenos takes the time with you and is always so positive..
Dr. Xenos is extremely compassionate Dr. and excellent surgeon. He is extremely decicated and meticulous Doctor and I would highly recommend him to my friends & family.
Dr. Xenos is the best!!!!!!!!!!!!! He has replaced both of my knees and he did a wonderful job. I am so pleased. All of his staff are kind and thoughtful to work with. Dr. Xenos has a great personality and always a joy to see him!!!! Have recommended him to many of my friends. He is a top notch doctor!!!!!!!!!
Very personable ! Too bad I had to wait over 2 hours to see him.
I am about to have surgery with Dr. Xenos. He and his staff are very professional, personable and attentive to all of my questions and needs. I am looking forward to a positive relationship with he and his staff. I highly recommend Dr. Xenos.
As a Professional athlete I have seen many doctors during my 13 year career. None were as kind, compassionate and knowledgeable as Dr. Xenos and his staff. Extra care was given to answer all my questions and to completely go over all my tests. Most importantly I was given options regarding my care. Dr. Xenos is by far one of the best physicians I have seen since I was seen at NIH. Best in Colorado for sure. Thank you Dr. Xenos
Dr. Xenos is a fantastic doctor who really cares about his patients. He goes above and beyond to make sure he and his staff are kind, considerate and offer excellent care. I've been under his medial care for several years and will not go to any one else.
Dr. Xenos is an Ivy League doctor with a successful joint replacement track record that speaks for itself.
This doctor was probably my 10th orthopedic doctor. He diagnosed me with something that no other doctor has thought of. I absolutely love him and I will see him from now on!! His office was so busy but he never made me feel rushed.
Made me feel comfortable, answered all questions straightforward and completely. Great staff! Will schedule soon. Thanks, Doug
Dr. Xenos and the staff at his office are the best at everything they do. I'm blessed to have found them.
PAs and staff do a very good job of coordinating and expediting office visits. They are very willing to take time to answer all of my questions. Dr. John is friendly, understanding, open and thorough. I am counting on them to be sure I have a complete recovery! LS
I've been seeing Dr. Xenos for a number of years about a progressive condition. There's always tradeoffs between aggressive and conservative treatments. I've always found Dr. Xenos and staff to be concerned about what I really want; to maintain my lifestyle. He is always giving his honest assessment of the options and presents them in a straightforward understandable manner. He's simply one of the best.
I am so grateful to have been referred to doctor John for a second opinion! I feel he is very knowledgeable and thorough. He takes my case seriously and is respectful about my concerns. I also appreciate that his office staff is involved and informed. Kudos on your team effort! LS
More like a friend than a Doctor, Love him, He did two knee and one hip reolacement in one year.
I am so thankful that my sister told me about Dr Xenos. This is the first time that I actually found out what is going on with my hip and what I need to do to make my life better. Dr. Xenos is an awesome communicator and he has a great sense of humor which helps put a patient at ease. It is hard to believe but I am looking forward to the surgery!!!
He is amazing, highly recommended!
Dr. X is great: personable and caring, and this is just pre-op!
This was my first time at his office. And my first impression with his staff was..... Wow....they all act like a professional staff. But lets not get to excited lets see what happens past these doors. And guess what Dr. John and staff hit it out of the ball park. I will recommend Dr. John to everyone that needs his services. And my husband hit it off with him to. And that says a lot.
Very pleased with him, his staff.
He is very easy to talk to and his staff is great. Brett is so helpful with everything you need she gets it done. Can't wait to have my surgery!
It was great as always.
Best surgeon, compassionate, precise, A _1!
The doctor explained my surgery in deep detail.Dr.Xeno made me feel ok bout havin both knees done. I feel great! I have been cheatin myself all the years i was scared to do the surgery.10 years i had pain . All can say is thank u to him and his great team they have change my life.I
I feel that I am receiving an elevated level of care from John Xenos. I appreciate the total support from the office staff. It is important to have the whole team behind my medical care. I also appreciate being treated as a whole person, not just a surgical event. I hope this continues post surgery and throughout my recovery! Thanks
I felt listened to and my needs acknowledged. I arrived feeling discouraged with my slow healing process and left with hope. Dr. Xenos helps me focus on the positive things that can be done and has always been compassionate and supportive. I am blessed to have him as my surgeon.
Very productive and informative visit. No questions unanswered.
Dr Xenos is always open to respond to questions and allows the time needed to cover all issues completely. He is very pleasant, highly professional and an all around great Doc!! Excellent communication skills with patients.
It was a great experience as it always has been.Dr. Xenos did a replacement on my right knee about nine years ago. He took very good care of me and the surgery was very successful.My knee is still doing good. Today i had to see Dr.Xenos today for my left knee. It was a very good appointment. I will always use Dr Xenos for my orthopedic needs.
Lack of respect for my time was not appreciated.
Excellent, he put me at ease, and I felt more confident about the knee replacement surgery.
HE WAS VERY NICE AND KNOWLEDGEABLE. DID NOT RECOMMEND UNNECESSARY TREATMENT OR PROCEDURES. WOULD GLADLY REFER HIM TO OTHERS.
Dr. Xenos was very professional!! He has a great sense of humor!!!
Dr. was nice but I waited almost two hours for an appointment that only took 10 minutes once I saw the doctor.
I only spoke with him briefly. The PA did most of the consultation.
I loved Dr. Xenos. He was very professional, friendly and compassionate. He knew what he was talking about and was very thorough in explaining everything! I would highly recommended him!!
I was very impressed with Dr. Xenos! He was extremely knowledgeable and thorough in his diagnosis and treatment plan. He made a point to connect personally with me several times which reassured me that he cared about me as a patient.
Loved him. Personable and smart and not into surgery for no reason :). As soon as he fixes my shoulder I'm taking my knee to him!
I think he is a down to earth doctor who listens to his patients concerns without passing judgement on the patients perspective of diagnosis. I would like to also note, that although the wait time was long, I was able to get an appointment immediately. Unlike other surgeons , I had to wait 6 weeks just for an initial appointment. With Zeno's, I could presumably ,already had the surgery. He's is worth the wait, not pushing through patients like cattle in a stockyard.
The entire office staff-- from the front desk to the xray tech to the scheduler we top-notch. Dr. Xenos' consultation was thorough and he truly listened to my symptoms.