Frank A. Ennis, MD


  • On the first anniversary of the second hip replacement, I wanted to write to formally thank you. I feel great. Play golf regularly. Exercise everyday when I don’t golf. Am strong, and have achieved much greater range of motion that I ever thought I would. In short, happy all around. (Letter from J.O.)

  • Dr. Ennis was extremely professional and knowledgeable during all phases of my recent total knee replacement surgery. I would not hesitate to highly recommend his services to anyone in need of hip or knee intervention. (5 star review on Healthgrades from L.T. in Westport, CT)

  • Dr. Ennis and his staff always take good care of me and I have recommended him to several people and all of them have also used him for their hip replacements. (Patient Survey)

  • Dr. Ennis was great! He was caring and professional! I would definitely recommend Dr. Ennis to my friends and family. (Patient Survey)

  • I travel down from the Hartford area just to see Dr. Ennis. I have had two knee replacements with follow-up appointments after each surgery. I think that says it all! (Patient Survey)

  • I was extremely impressed with Dr. Ennis and his knowledge of my rare condition and the time he took to fully explain my issues. (Patient Survey)

  • I was extremely happy with the results of my surgery done by Dr. Ennis. I was impressed with how knowledgeable and professional the nursing staff was as well as the scheduling staff. (Patient Survey)

  • Dr. Ennis: Let me first thank you for the great job you did replacing my hip. What I had not expected was to be so impressed by each and every member of the ONS staff that I had interactions with. The office staff was at all times courteous, knowledgeable, and professional. The medical staff patiently explained every aspect of my procedure and answered my questions clearly. At all levels, each and every member of the ONS team appeared to both enjoy and excel at their professions. Thank you for your good work and that of the ONS team. – WHP (Hip)

  • Dr. Ennis: Thanks to you, I closed out 2015 on the slopes in NH with my son, catching the first snowfall and getting in two days of skiing.  All went smoothly. I stuck to the blues as you suggested (the only ones open anyway) and the hip performed better than ever. Then we returned to CT and I took my 4-year-old granddaughter to Mohawk yesterday. Thank you for the great work. Take care. (S.S.)


  • Dr. Ennis: I am totally ecstatic with all aspects of treatment. The results of my total hip replacement surgery have been extraordinary in both length of time to being able to walk without pain and without cane, crutches or walker. Dr. Ennis is a magician. I have gone out on the golf course and its only been five weeks since the operation.  (Comment from patient satisfaction survey)


  • Dr. Ennis –  I am so impressed by Dr. Ennis’ confidence, compassion and skill as a surgeon. I have had a number of surgeries for my joints in the past and having my hip replaced was by far the easiest and relatively painless.  Physical fitness is extremely important to me. Before surgery, my hip had gotten to the point where just walking and going up stairs was excruciating. Dr. Ennis took the time to fully explain the mechanics of what was wrong with my hip and how he was going to fix it.  I was amazed that I walking without a cane two days after surgery! Now I can walk, ride a bike, do anything really because my legs are stronger than they have been in three years. I’m going out to California next month and I can’t wait to go windsurfing again. (J.B.)

  • Dr. Ennis, I would like to thank you for doing my hip surgery. I feel great. You did my surgery in October and I’m walking better than I did prior to the surgery. Once again, thank you. (M.B.)

  • Dear Dr. Ennis –  I can’t thank you enough for giving me a new knee so I can hop around more quickly after my 2 year old grandson that I take care of three days a week. You are a truly brilliant surgeon. I also appreciate your accepting medicare assignment. I know since I was a former medical office manager that you only receive a fraction of what you truly deserve…also, your terrific physical therapy group, (especially Betsy) accepted medicare because you did surgery on me. (N.B.)

  • Dr. Ennis – I can’t begin to express my gratitude to you for making it possible for you to perform my knee surgery. It was so reassuring knowing I had such a great team that my anxiety level was “almost” zero! Your office is run so professionally, and my experience with the Greenwich Hospital team was amazing. One week post-op, I am improving and looking forward to enjoying my new, strong knee! Thank you again – see you soon. (K.S.)

  • Dr. Ennis– I just wanted you to pass on a personal message to Dr. Frank Ennis of what a fantastic job he did on my hip replacement. I was walking up stairs 3 days after surgery and out of the rehab place in 48 hours. I had previously looked at options of getting this surgery done in Monaco, London, New York, and Boston and am blessed that I found Dr Ennis just down the road. Eternally grateful, all best. (P.E.)

  • Dr. Ennis– Thank you for being so “normal” and answering all my questions frankly and your great staff. You’ll be happy to know I’m doing well…each week gets better as you promised. I know I am doing so well because of you. (C.S.)