Orthopaedic and Neurosurgery Specialists PC

ONS Harrison

Orthopedic Surgery, Neurosurgery · 10 Providers

Average Rating of all Office Providers
Today's Office Hours: Closed
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Office Providers

Dr. Michael Clain, MD

Dr. Michael Clain, MD

Orthopedic Surgery

Dr. Marc Kowalsky, MD

Dr. Marc Kowalsky, MD

Orthopedic Shoulder & Elbow Surgery


Office Provider Reviews


based on the average of 235 provider reviews for Orthopaedic and Neurosurgery Specialists PC

Review of Dr. Berliner

- in DARIEN , CT |

Dr. Berliner did an anterior hip replacement on me in January and I could not be happier with the results. He is a complete professional, treating me with the upmost respect and care. He is patient, kind, competent and totally without ego. I highly recommend him.
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Review of Dr. Delos


Dr. Delos is a excellent person and doctor. Always on time for appointments. Awesome bedside manners. I never felt rushed. Always took the time to answer all of my questions. The facilities and staff were equally professional.
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Review of Dr. Sethi

- in Westport, CT |

What an all star! I had a lot of shoulder trauma in my youth requiring 4 extensive surgeries in the 80s and 90s. All of these repairs led me to a serious arthritic situation requiring me to have a total shoulder replacement in my 50s. After careful review, I selected Paul Sethi at ONS. A great choice! The operation took place in their Stamford medical suite so no risk from all of those infectious transmissions that can show up in the hospital. Paul was extremely thorough in his diagnostic prep and model building leading to a very smooth procedure. What blew me away was that I NEVER had any pain after the operation! My rehab was smooth and my therapist says he has never seen such a phenomenal total shoulder replacement in terms of range of motion, fast recovery and overall strength. The frequent office follow ups were reassuring and conservative. I could not be happier and recommend Dr. Sethi wholeheartedly!!! This guy is a winner.
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Review of Dr. Kowalsky

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After receiving no relief from a major NYC Ortho hospital for a severe case of tennis elbow, I found Dr. Kowalsky. He assured me that even at my age, 66, there was no reason that my tennis days had to be behind me. He performed surgery flawlessly, and I was back on the tennis court in 3 months, playing some of the best tennis I have played in years. I will be eternally grateful to him for not putting me out to pasture and I will continue to recommend him to others. He is kind, caring and an excellent surgeon. Simply the best!
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Dr. Kowalsky:
Thank you for your kind words about Dr. Kowalsky and for sharing your experience. Congratulations on your recovery!... more
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Review of Dr. Delos


Dr. Delos explained my displaced meniscus injury and his recommendations for fixing it so that I could get back to doing what I could before. He was very clear and very positive in his description, diagnosis and surgery to be done. I had been suffering for over a month and received several other recommendations from another doctor. I felt confident that the surgery he recommended would fix the issue. He also was able to get me in for the surgery within the week. Arthroscopic surgery went well, physical therapy went well and I was able to walk without a cane and drive in 2 weeks. No pain after surgery. It was important to get to PT quickly after surgery and to follow the plan outlined by the therapist. I would recommend Dr. Delos for a knee injury.
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Dr. Delos:
Thank you so much for taking the time to share your ONS experience with Dr. Delos. We are so pleased your knee is feeling better.... more
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Review of Dr. Delos

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Dr. Delos was fantastic. He made an expert repair on my torn tendon and the follow up and follow through with the Dr. and with ONS PT was outstanding.
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Dr. Delos:
Jon, thank you for your glowing review of Dr. Delos and ONS PT.... more
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Review of Dr. Delos

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Dr. Delos changed my life! I went into my first appointment not knowing what to expect, and truly scared. He was kind, understanding, and extremely knowledgeable of my situation. I went in thinking my knee was dislocating, and after ten minutes of talking and examining my knee, Dr. Delos explained to me that my knee cap was dislocating, making it looser each time. I had surgery a month later and now I feel so much more secure! I can do everyday activities with ease, whereas before I was scared to even walk. I highly recommend Dr. Delos! He was amazing in everyway!
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Review of Dr. Kowalsky

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This is a follow-up to my 5-star review of Dr. Kowalsky (dated 12/13/18), shortly after I completed P/T and had my last visit with the doctor. I had suffered a very serious shoulder injury while bicycling late May 2018. Dr. Kowalsky performed a complex surgery mid-June to repair my shoulder, which had several tears of the rotator cuff and biceps. I am now back on my bicycle, and doing the somewhat challenging rides that I had been doing prior to my accident, although perhaps a bit more carefully. My shoulder feels great, is working great, and I can't speak highly enough of Dr. Kowalsky's surgical skills and wonderful bedside manner. I would highly recommend him to anyone with a shoulder injury.
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Dr. Kowalsky:
Thank you, Bruce!... more
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Review of Dr. Wei

- in Stamford , CT |

Dr. Wei recently performed surgery on my wrist. He has a patient manner about him and clearly articulated the problem and possible solutions. I’d certainly consult Dr. Wei first if future hand or wrist problems arise.
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Dr. Wei:
Thank you for giving a shout out to Dr. Wei!... more
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Review of Dr. Delos

- in Wilton, CT |

Dr Delos did surgery on my 15 year old son's shattered collarbone, putting in a long plate and 8 screws. My son felt very little pain within 2-3 days and none by one week out. His physical therapist was AMAZED at his mobility and strength - and the fact that he had zero pain - and gave all the credit to his surgeon. Dr Delos followed up himself by phone and then multiple appts to make sure all was well. To my son's delight he was cleared to return to lacrosse 2 weeks earlier than expected. We would recommend him without any hesitation!
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Dr. Delos:
Your comments mean to world to Dr. Delos and all of us at ONS!... more
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Learn About Orthopaedic and Neurosurgery Specialists PC

170 Procedures

  • Achilles Tendon Reconstruction
  • Achilles Tendon Rupture Repair
  • Achilles Tenotomy
  • Acl Surgery
  • All Shoulder Or Elbow Replacement Procedures
  • Ankle Arthroscopy
  • Ankle Fracture Repair
  • Ankle Fusion
  • Ankle Ligament Reconstruction
  • Ankle Replacement
  • Ankle Surgery
  • Arm Surgery
  • Arthroscopic Knee Shaving
  • Arthroscopic Shoulder Surgery
  • Arthroscopic Surgery
  • Arthroscopic Wrist Surgery
  • Bi-Compartmental Knee Replacement
  • Bicep Repairs
  • Brain Surgery
  • Brain Tumor Surgery
  • Bunion Surgery
  • Bunionette Correction
  • Calcaneal Osteotomy
  • Carpal Tunnel Release
  • Carpal Tunnel Release Surgery, Endoscopic
  • Carpal Tunnel Release Surgery, Open
  • Cerebrospinal Fluid (Csf) Shunt - Insertion, Repair Or Removal
  • Cervical Facet Joint Injection
  • Congenital Hand Surgery
  • Cortisone Injection
  • Craniectomy, Craniotomy, Surgery Of Skull Base, Neuroendoscopy
  • De Quervain'S Release
  • Debridement
  • Dressing And-Or Debridement Of Wound, Infection, Or Burn (Incl. Negative Pressure Wound Therapy)
  • Elbow Arthroscopy
  • Elbow Fracture And Dislocation Treatment
  • Elbow Fracture And-Or Dislocation Treatment, Closed
  • Elbow Fracture And-Or Dislocation Treatment, Open
  • Elbow Ligament Reconstruction
  • Elbow Reconstruction
  • Elbow Replacement
  • Elbow Surgery
  • Elbow Tenotomy
  • Emg (Electromyography)
  • Endoscopic Hand Surgery
  • Endoscopic Plantar Fasciotomy
  • Endoscopic Wrist Surgery
  • Epidural Block, Facet Blocks
  • Epidural Cortisone Injection
  • Epidural Steroid Injections
  • Excision Of Humerus
  • Excision Of Radius Or Ulna
  • Excision Of Scapula, Clavicle, Rib, Or Sternum
  • Excision Of Tarsal Or Metatarsal
  • Excision Of Tibia Or Fibula
  • Facet Joint Injection
  • Finger Joint Fusion
  • Foot And Ankle Dislocationtreatment, Open
  • Foot And Ankle Fracture And Dislocation Treatment
  • Foot And Ankle Fracture Treatment, Open
  • Foot And Ankle Ligament And Tendon Repair
  • Foot And Ankle Reconstruction
  • Foot And Ankle Surgery
  • Foot Surgery
  • Forefoot Reconstruction
  • Fracture And-Or Dislocation Treatment
  • Fracture Care
  • Glenoid Labrum Repair
  • Hammer Toe Repair
  • Hand And Elbow Microvascular Surgery
  • Hand And Wrist Fracture And Dislocation Treatment
  • Hand And Wrist Fracture Treatment, Closed
  • Hand And Wrist Fracture Treatment, Open
  • Hand And Wrist Fusion
  • Hand Or Wrist Tendon Transfer
  • Hand Reconstruction
  • Hand Surgery
  • Hand Tendon Repair
  • Hand, Elbow, And Shoulder Microvascular Surgery
  • Herniated Disc Surgery
  • Hip Fracture And Dislocation Treatment
  • Hip Fracture And-Or Dislocation Treatment, Closed
  • Hip Fracture And-Or Dislocation Treatment, Open
  • Hip Replacement
  • Injection Of Tendon
  • Joint Drainage
  • Joint Injection
  • Knee And Leg Fracture And Dislocation Treatment
  • Knee And Lower Leg Fracture Treatment, Closed
  • Knee And Lower Leg Fracture Treatment, Open
  • Knee Arthroscopy
  • Knee Cartilage Implantation
  • Knee Cartilage Repair
  • Knee Cartilage Treatment
  • Knee Debridement
  • Knee Dislocation Treatment
  • Knee Ligament Reconstruction
  • Knee Osteotomy
  • Knee Replacement
  • Knee Surgery
  • Knee Tendon Repair
  • Lamina Procedures (Incl. Laminectomy, Laminoplasty, Laminotomy)
  • Ligament Reconstruction
  • Lumbar Epidural Steroid Injection
  • Lumbar Facet Joint Injection
  • Metatarsal Osteotomy
  • Metatarsal Surgery
  • Midfoot Fracture And-Or Dislocation Surgery
  • Mini Knee Surgery
  • Morton’S Neuroma Surgery
  • Myofascial Trigger Point Injection
  • Nerve Block, Somatic
  • Nerve Blocks
  • Nerve Destruction By Neurolytic Agent
  • Nerve Reconstruction
  • Nerve Surgery
  • Open Reduction Internal Fixation (Orif) Of Metatarsal Fracture
  • Osteotomy
  • Pain Management
  • Partial Knee Replacement
  • Partial Shoulder Replacement
  • Peripheral Nerve Block
  • Platelet-Rich Plasma Injection (Prp)
  • Posterior Tibial Tendon Reconstruction
  • Reconstructive Ankle Surgery
  • Reconstructive Foot Surgery
  • Resection Or Ablation Of Bone Tumor, Partial Or Complete Resection Of Bone, Debridement Of Bone
  • Reverse Total Shoulder And Total Shoulder Replacement
  • Revision Of Shoulder Or Elbow Replacement
  • Revision Surgery
  • Rotator Cuff Surgery
  • Sacroiliac Joint Injection
  • Separated Femoral Epiphysis Treatment
  • Shoulder Cartilage Treatment
  • Shoulder Dislocation Treatment
  • Shoulder Fracture And Dislocation Treatment
  • Shoulder Fracture Treatment
  • Shoulder Reconstruction
  • Shoulder Replacement
  • Shoulder Resurfacing
  • Shoulder Stabilizations
  • Shoulder Surgery
  • Simple Fracture Care And Casting
  • Spinal Compression Fracture Repair
  • Spinal Decompression
  • Spinal Discectomy
  • Spinal Fusion
  • Spinal Nerve Block
  • Spinal Reconstructive Surgery For Deformities
  • Spine Fracture Treatment
  • Spine Surgery
  • Sports Medicine Related Procedures
  • Sports Medicine Surgery
  • Stem Cell Transplant
  • Steroid Injection
  • Subtalar Arthrodesis
  • Tendon Repair
  • Tendon Surgery
  • Tommy John Surgery
  • Tricep Repair
  • Trigger Finger Release
  • Trigger Point Injection
  • Uni-Compartmental Knee Replacement
  • Viscosupplementation With Hyaluronate
  • Wrist And Forearm Tenotomy
  • Wrist Fusion
  • Wrist Ligament Reconstruction
  • Wrist Reconstruction
  • Wrist Replacement
  • Wrist Surgery


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Who We Are

  • With 26 sub-specialty trained physicians in orthopedics, neurosurgery, sports medicine and physical medicine/rehabilitat Read More

Language Services

  • Chinese, Mandarin
  • Greek
  • Mandarin
  • Russian
  • Spanish

Orthopaedic and Neurosurgery Specialists PC accepts 14 insurance carriers

  • Aetna
  • Anthem
  • Anthem Blue Cross Blue Shield
  • Blue Cross Blue Shield
  • Cigna
  • Connecticare
  • EmblemHealth
  • First Health (Coventry Health Care)
  • Golden Rule
  • Harvard Pilgrim Health Care
  • Oxford Health Plans
  • Tufts Health Plan
  • UnitedHealthCare
  • Worker's Compensation
*Please verify this information when scheduling an appointment.