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Chicago Arthritis and Regenerative Medicine

At Chicago Arthritis and Regenerative Medicine, next-generation stem cell therapy and platelet procedures are available today. Our focus is on thorough evaluation and non-surgical treatment of arthritis, tendinitis, joint injuries, and pain. Our core beliefs include a patient dedicated approach, faith in evidence-based treatments, continuous improvement in everything we do at work, and pursuit of better treatments. If you are in need of treatment for your pain or are considering elective surgery for your condition, please contact us first to learn about the most advanced regenerative procedures available in the United States today.

As a provider of the Regenexx® Orthopedic Stem Cell and Platelet Procedures, the regenerative treatments we offer are at the cutting edge of medical science and are backed by more research than any other stem cell or platelet procedures for orthopedic conditions. For our inflammatory arthritis and autoimmune patients, we incorporate advanced imaging and the most effective biologic treatments when appropriate.

Our goals are to accurately diagnose your condition as well as utilize treatments that have the potential to minimize pain and maximize your functional ability.

Areas treated

Cervical Spine, Foot & Ankle, Hand & Wrist, Hip, Knee, Lumbar Spine, Shoulder, Thoracic Spine

Schedule a Consultation at Chicago Arthritis and Regenerative Medicine


618 W. Fulton St.
Chicago, IL 60661


Siddharth Tambar, MD

Professional interests

  • Newer regenerative medicine treatments for chronic musculoskeletal problems, including the use of Platelet Rich Plasma and Stem cells for tendinitis and arthritis.
  • Newer treatments for autoimmune diseases, including for rheumatoid arthritis, psoriatic arthritis, and ankylosing spondylitis.
  • Musculoskeletal ultrasound for diagnosis of various joint/tendon/nerve conditions, and for guided injections.


  • 2008 Rheumatology Fellowship, Northwestern Memorial Hospital
  • 2004 Internship and Residency in Internal Medicine, Northwestern Memorial Hospital
  • 2001 Doctorate of Medicine, State University of New York at Syracuse
  • 1997 BA Economics, Summa Cum Laude, State University of New York at Buffalo


  • 2001 Alpha Omega Alpha, State University of New York at Syracuse
  • 1997 Summa Cum Laude, State University of New York at Buffalo
  • 1997 Phi Beta Kappa, State University of New York at Buffalo.
  • 1997 Dean’s Departmental Award, Economics Department, State University of New York at Buffalo.
  • 1993-1997 State University of New York at Buffalo Honors Program


  • Board Certified Rheumatology 2008
  • Board Certified Internal Medicine 2004
  • American Institute Ultrasound Medicine Certified in Musculoskeletal Ultrasound 2012
  • Musculoskeletal Ultrasound Certification in Rheumatology (RhMSUS) 2013

Professional Affiliations

  • Regenexx Network Physician
  • American College of Rheumatology- Musculoskeletal Ultrasound Education Planning Committee member
  • American Institute of Ultrasound Medicine
  • Internation Cellular Medicine Society
  • Illinois State Medical Society
  • Chicago Medical Society

Areas treated: Foot & Ankle, Hand & Wrist, Hip, Knee, Shoulder

No matter what my patients require to stop hurting, I’m here to either provide it for them myself or show them where to find a solution. Our capabilities are vast at Chicago Arthritis — we perform procedures ranging from injections to minimally invasive surgeries. We also focus on managing your condition rather than masking it. Many of my patients have been suffering for years, so finally giving them relief and allowing them to enjoy their favorite activities gives me great satisfaction.


Interventional Orthopedics Foundation, International Society for Neurofeedback and Research, World Academy of Pain Medicine Ultrasonography, American Society of Anesthesiologists, American Society of Regional Anesthesia and Pain Medicine, National Medical Association, Massachusetts Society of Anesthesiologists


Purdue Science Scholar, Senator Richard Lugar Scholar, Golden Key National Honor Society, Phi Beta Kappa Society, Cook County Physician Association Scholar, Northwest Indiana Physician Association Scholar

Areas treated: Cervical Spine, Hip, Knee, Lumbar Spine, Shoulder, Thoracic Spine

Michelle Nordstrom
1 year ago
Very pleasant experience. All staff from the front desk to the MD were extremely pleasant and respectful. Would definitely recommend to others.…
Alfie Omega
1 year ago
After I was diagnosed with an auto-immune disorder, I struggled to find a great Rheumatologist. I was very grateful to have had…
Maryann Carlson
3 years ago
I am thrilled I did my research and chose Chicago Arthritis. Dr Tambar is great and very knowlegable and so is his…
Jeff Hugh
12 months ago
Two enthusiastic thumbs up!! Recently went to Chicago Arthritis and seen Dr Tambar for PRP therapy. The injections were a god send,…
Elizabeth Blasgen
1 year ago
Dr T takes the time to understand your issues. Long process so still waiting for PRP will help.…
Steven Smith
2 months ago
I just moved to the city and needed to find a rheumatologist and was referred to Dr. Tambar. I could not be…
Gary Stephens
5 years ago
I have osteoarthritis in my shoulder and the treatment I received from Dr. Tambar and his staff is one of the best…
Max Molder
1 year ago
Excellent customer service and excellent care! Way above and beyond what was expected!…
Lyn Denny
10 months ago
Doctor and staff are great. I am close to 70 years old and very active. My stem cell treatment 7 months ago…
Mack Dee
4 years ago
I love working with Dr.Tambar, and his staff. Very professional.…
David Murillo
4 weeks ago
Dr. Tambar and the staff are extremely professional and knowledgeable about multiple health conditions involving spine/shoulder/knee etc injuries. My personal experience of…
Dennis Doherty
3 months ago
Well again I have just left Dr. Tambar’s Office. I’m afraid I’m going to create a six-star review category. Again, he took…
David Murillo
1 year ago
The entire experience was great from start to finishDr. Tambar is extremely professional , friendly well educated and number one in the…
MaryKaye Green
1 year ago
Great doctor and listens to your concerns! Always on time. Girls in office very friendly and efficient . Love the new location…

Consider Regenerative Treatment at Chicago Arthritis and Regenerative Medicine and Avoid the Painful Recovery and Downtime Following Surgery

Regenexx® regenerative orthopedic treatments are helping individuals avoid surgery and get back to their daily active lifestyles. These non-surgical treatments are designed to assist the body's natural healing mechanisms by activating and increasing the local cells that are responsible for repairing damaged tissue.

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*DISCLAIMER: Like all medical procedures, Regenexx® Procedures have a success and failure rate. Patient reviews and testimonials on this site should not be interpreted as a statement on the effectiveness of our treatments for anyone else.

Providers listed on the Regenexx website are for informational purposes only and are not a recommendation from Regenexx for a specific provider or a guarantee of the outcome of any treatment you receive.