Baron S. Lonner, MD's portrait
Baron S. Lonner, MD
Professor of Orthopaedic Surgery
Icahn School of Medicine at Mount Sinai
New York, NY
Dr. Lonner is a member of the SpineUniverse Editorial Board.

About Baron S. Lonner, MD

Baron S. Lonner, MD is the Director of Scoliosis Associates in New York City, a practice dedicated to the diagnosis and comprehensive treatment of patients with scoliosis and other spinal deformities. Additionally, Dr. Lonner is Professor of Orthopaedic Surgery at Icahn School of Medicine at Mount Sinai in New York City.

Dr. Lonner is one of the most experienced leaders throughout the Northeast and the U.S. in minimally invasive surgery using spinal endoscopy for scoliosis and other deformities. He is at the forefront of research and innovation in this area and in complex spinal reconstructive surgery in pediatric and adult patients.

Dr. Lonner received his undergraduate and medical degrees from Boston University, where he was in the accelerated six-year medical program. During medical school, he was honored for his work on congenital scoliosis, which was later presented at the international Scoliosis Research Society meeting. Dr. Lonner had formal scoliosis surgical training during his residency at The Albert Einstein College of Medicine and Montefiore Medical Center. Additional scoliosis and spine surgical training was completed at The Cornell University Medical Center and The Hospital for Special Surgery.

Dr. Lonner was formerly the Chief of the Spine and Scoliosis Division of the Department of Orthopaedic Surgery at Long Island Jewish Medical Center/Schneider Children's Hospital. He left that position to assume the role of Director of The Spine and Scoliosis Treatment Center. He is an Assistant Professor of Orthopaedic Surgery at New York University Medical School, NY.

Dr. Lonner is a member of several prestigious scholarly organizations, including the Scoliosis Research Society, North American Spine Society, and The American Academy of Orthopaedic Surgery. He is Board Certified in Orthopaedic Surgery. As an active researcher in the area of scoliosis and spinal deformity he has authored and presented numerous publications.

In addition to his work with patients at Scoliosis Associates, Dr. Lonner devotes approximately one month of his time each year to perform charitable care for patients with severe spinal deformities in developing countries. He has worked in the Dominican Republic, other parts of Latin America, and Africa.

Dr. Lonner is deeply committed to international patient education and care. He has recently launched spinal deformity information websites in the Hindi language and the Chinese language. providing scoliosis and spine information to those communities.



1. Lonner BS, Kondrachov D, Siddiqi F, Hayes V, Scharf C. Thoracoscopic spinal fusion versus posterior spinal fusion for thoracic adolescent idiopathic scoliosis. Journal of Bone and Joint Surgery, accepted for publication pending revisions.

2. Lonner BS, Scharf CS, Antonacci D, Goldstein Y, Panagopoulos G. The learning curve associated with thoracoscopic spinal instrumentation. Spine, in press.

3. Levin R, Matusz D, Hasharoni A, Scharf CS, Lonner B, Errico T. Mini-open thoracoscopically-asssisted thoracotomy versus video-assisted thoracoscopic surgery for anterior release in thoracic scoliosis and kyphosis. A comparison of operative and radiographic results. The Spine Journal, in press.

4. Silber, J.S.; Lipetz, J.S.; Hayes, V.M.; Lonner, B.S.: Measurement Variability in the Assessment of Sagittal Alignment of the Cervical Spine: A Comparison of the Gore and Cobb Methods. Journal of Spinal Disorders & Techniques 2004;Vol.17(4):301-305.

5. Lonner, B.; Siddiqi, F.N.; Hayes, V.M.; Verma, R.; Tuckman, D.; Silber J.S.: A Randomized Comparison of Open versus Fluoroscopic Guided Placement of Pedicle Screws in a Human Cadaveric Model. Pan Arab Journal of Neurosurgery 2005;Vol.9(2):265-270.

6. Lonner B, Boachie O., Murthy S. Single-staged sequential double anterior posterior spinal reconstruction for rigid adult scoliosis. The Spine Journal, January, 2005.

7. Lonner, B; Siddiqi, F.N.; Hayes, V.M.; Tuckman, D; Silber, J.S.: "Comparison of open versus fluoroscopic guided placement of pedicle screws in a human cadaveric model." In press.

8. Lonner B. Surgeon Volunteerism: One surgeon's perspective. Bull Hosp Jt Dis. 2003;61(3-4):148-9.

9. Hoppenfeld, S; Lonner, BS; Murthy, V. The rib epiphysis and other growth centers in the treatment of scoliosis. Spine, 2003;29:47-50.

10. Boretz, R; Lonner, BS. Atypical presentation of an osteoid osteoma in a child. Am J of Orthop, 347-348, 2002.

11. Love, C; Patel, M; Lonner, B; Torres, MA; and Palestro, CJ. Diagnosing spinal osteomyelitis: a comparison f bone and Ga-67 scintigraphy and magnetic resonance imaging. Clin Nucl Med 25(12):963-77.

12. Hoppenfeld, S; Gross, A; Andrews, C; Lonner, B. The ankle clonus test: A new test for assessing the integrity of the spinal cord in scoliosis surgery. Journal of Bone and Joint Surgery, 79-A:208-212, 1997.

13. Lonner, B; Harwin, S. Chondromalacia patellae. A review. Part I. Contemporary Orthopaedics, 32(2):81-86, 1996.

14. Lonner, B; Harwin, S. Chondromalacia patellae. A review. Part II. Contemporary Orthopaedics, 32(3):161-165, 1996.

15. Lonner, B; Cammisa, FP; Ranawat, CS. Rheumatoid arthritis of the cervical spine. Seminars in Arthroplasty, 6(3):193-201, 1995. 16. Lonner, B; Lonner, J; and Sadler, A. Retrograde femoral nailing between an ankylosed hip and knee. A case report. Journal of Orthopaedic Trauma, 9(3):266-269, 1995. 17. Lonner, B; Harwin, S. Treatment of sepsis of the hip following total hip arthroplasty. Contemporary Orthopaedics, 31(1):23-29, 1994.

Contributed to: Massell, BF; Chute, CG; Walker, AM; Kurland, GS. Penicillin and the marked decrease in morbidity and mortality from rheumatic fever in the United States. The New England Journal of Medicine, 318:280-286, 1988.


1. Lonner, B. Minimally invasive techniques in spine surgery. For: Spine Secrets, edited by Devlin, V. 2004.

2. Lonner, B. Domino construct for neuromuscular pelvic obliquity. For: Surgical Techniques for the Spine, edited by Haher, T; Merola, A. Thieme, New York, 2003.

3. Lonner, BS; Patel, A; Hoppenfeld, S. Thoracolumbar spine fractures. For: Orthopaedic Rehabilitation, edited by Hoppenfeld, S. Lippincott. 2000.

4. Patel, A; Lonner, BS; Hoppenfeld, S. Cervical spine fractures. For: Orthopaedic Rehabilitation, edited by Hoppenfeld, S. Lippincott. 2000.

5. Lonner, BS; Boachie-Adjei, O. Adult spinal deformity. For: Textbook for Orthopaedic Surgery, edited by Craig, E. Media, Williams and Wilkins. 1999.

6. Lonner, BS; Cammisa, FP. Lumbar spine injuries in sports. For: Sports Neurology, 2nd Edition edited by Jordan, B; Tsairis, P; and Warren, R. Raven Press, New York, 1998.

7. Lonner, BS; Boachie-Adjei, O. Spinal deformity. Pediatric Clinics of North America, 43(4):883-897, 1996.

Articles Written by Baron S. Lonner, MD

FAQs about Flatback Syndrome

A loss of normal low back lordosis or actual kyphosis in the lumbar spine may produce a symptom called flatback syndrome.

Recovery from Scoliosis Surgery

If you're getting ready for scoliosis surgery, read these recovery tips from a spine surgeon. You'll learn what will happen at the hospital just after surgery and what will happen at home.

How to Prepare for Scoliosis Surgery

Three tips how to prepare for scoliosis surgery from an orthopaedic spine surgeon who specializes in treating scoliosis. To understand your potential surgical risk factors know about the types of pre-operative testing you may undergo.

Pediatric Scoliosis Surgical Technologies: Growing Rods, Growth-Guided Devices, Vertebral Body Tethering

Traditional and magnetically controlled growing rods, growth-guided devices, and vertebral body tethering (fusionless correction) are explained and shown in many pre- and postoperative x-rays.

Pediatric Scoliosis Surgery Guide

Pediatric Scoliosis Surgery Guide provides information about curve correction in young patients, including spinal and in-situ fusion, instrumentation, and hemivertebra removal.

Flatback Syndrome (Kyphosis): Possible Scoliosis Surgery Complication

Patients who had Harrington rods implanted to correct scoliosis may develop flatback syndrome (kyphosis). What is this spinal condition? See images in this article.

Early Onset Scoliosis in Children

Early onset scoliosis (EOS) is an abnormal sideways curvature of the spine found in children under the age of 10 years. Scoliosis expert explains EOS diagnosis and treatment.

Common Questions about Scoliosis Surgery

Five questions patient ask about scoliosis surgery answered by a spine specialist include pregnancy and potential allergic reaction to spinal instrumentation.

Flatback Syndrome: Spine Surgery to Correct Spinal Alignment

Flatback syndrome surgery is performed to correct spinal alignment to normal or near normal to relieve stress on the postural muscles of the back, hips, and knees.

Scoliosis Surgery: Approaches and Procedures

Baron Lonner, MD, a spine surgeon, gives details on all spine surgery procedures used to treat scoliosis. Educate yourself about scoliosis surgery options.

Kyphosis Surgery

The goal of spine surgery to correct kyphosis is to restore the spine to normal kyphosis, which is a curve between 20 and 50 degrees.

Images of Scoliosis Curves

See x-rays of scoliosis curves. What does your curve look like?

Case Studies Presented by Baron S. Lonner, MD

Vertebral Body Tethering in Progressive Adolescent Idiopathic Scoliosis

Fusionless emerging technology case
Presented by: B. Lonner MD
The family of healthy girl with progressive scoliosis, with a great deal of concern about spinal fusion (eg, flexibility, function) sought consultation to discuss surgical correction. Their child is an avid lacrosse and basketball player and enjoys horseback riding.

Progressive Thoracic Idiopathic Scoliosis

Presented by: B. Lonner MD

The patient is a 15-and-7/12 year-old female with a right thoracic idiopathic scoliosis of 80º. She reports backache when seated for prolonged periods of time; such as the 9-hour car drive for this appointment.

Adolescent Idiopathic Scoliosis in a 17-year-old Boy

Presented by: B. Lonner MD
The patient is a 17-year-old boy who presented with AIS and worsening truncal deformity. He indicated increasing activity-related discomfort over the lumbar convexity over the prior 6 months and significant waistline changes.

Severe Progressive Adult Idiopathic Scoliosis

Presented by: B. Lonner MD

The patient is a 54-year-old female diagnosed with idiopathic scoliosis as an adolescent. Twenty years earlier, despite the presence of a significant progressive spinal deformity, she was told that she was not a surgical candidate because of her age.

Articles Reviewed by Baron S. Lonner, MD

Recombinant Bone Morphogenetic Protein Linked to Reduce Risk of Reoperation Following Spine Fusion for Adult Scoliosis

It is incumbent upon surgeons and researchers to provide clinical data for use of BMP in fusion surgery not only from large administrative databases, but also from single center studies.

Ankylosing Spondylitis: Description and Diagnosis

Ankylosing Spondylitis (AS) is a chronic inflammatory arthritis condition that can affect the spine. Spine expert-written article on ankylosing spondylitis and how it's diagnosed.

Scheuermann's Kyphosis: Non-Operative and Surgical Treatment

Treatment for Scheuermann's kyphosis depends on the patient's age, severity of the curve, and the presence of neurological problems.

Scheuermann's Kyphosis (Scheuermann's Disease): Abnormal Curvature of the Spine

A normal, healthy spine should have curves in it. When you look at it from the side, you should see these curves. However, too much curvature in the thoracic spine (mid-back) can be problematic. That’s a condition called kyphosis.

Managing Neurological Complications in Pediatric Spinal Deformity Surgery

Improving neurological outcomes in spinal deformity surgery include risk severity stratification, experience, intraoperative monitoring, and uniform response to neuromonitoring alerts.

Radiation-Free Surface Topography Is Highly Correlated With X-Ray Outcomes and Self-Image in Adolescent Idiopathic Scoliosis

Study explores scoliotic body shape distortions that are not depicted by x-rays routinely used to assess spinal curvature and improvements with corrective surgery.

Thoracoscopy in the Treatment of Scoliosis

Thoracoscopy is a minimally invasive spine surgery performed to treat thoracic scoliosis. Thoracoscopy combines the science of endoscopy (video-assisted surgery) with thoracotomy (access to chest, or thoracic spine).

Surgery for Ankylosing Spondylitis

Seldom is surgery needed to treat ankylosing spondylitis, however, here are 4 indications your surgeon may consider before recommending spine surgery.

Surgical Management of Thoracolumbar Deformity in Ankylosing Spondylitis

Ankylosing Spondylitis (AS) is a chronic inflammatory disease that at times may require surgery.

Kyphosis and Scheuermann's Disease

Scheuermann's disease is a type of kyphosis that occurs when healthy vertebral become wedge shaped.

Discussion: Isthmic Spondylolisthesis: Reduction vs. In-Situ Fusion?

A discussion of the SOCON Spondylolisthesis Reduction System.

Clinical Series of Spondylolisthesis Reductions

The outcomes of a clinical series of spondylolisthesis reductions utilizing the SOCON Spondylolisthesis Reduction System.

Evaluation of Neural Tension at the Time of Spondylolisthesis Reduction

An illustrated discussion of the evaluation of neural tension by means of cadaveric study.

Surgical Treatment of Isthmic Spondylolisthesis

Most surgeons utilize pedicular fixation where arthrodesis of adult isthmic spondylolisthesis is undertaken.

Isthmic Spondylolisthesis: Reduction vs. In-Situ Fusion?

Isthmic spondylolisthesis is an extremely common cause of lumbar symptomatology and remains one of the most common indications for lumbar reconstruction.

Financial Disclosures

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To help achieve this goal, SpineUniverse requires all authors, editors, and reviewers to disclose any financial relationships or affiliations they have with companies whose products or services may be mentioned in the content they author, edit, or review.

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Author's Statement

I, or an immediate family member, have a financial interest(s) or affiliation(s) with the following commercial companies whose products and / or services may be mentioned in the materials I have authored, edited or reviewed for presentation on Remedy Health Media, LLC’s websites.

Disclosed Relationships

Research Support
Grants: DePuy/Synthes; John and Marcella Fox Fund; OREF
Consultant/Independent Contractor
DePuy/Synthes; Unyq Align; ApiFix; Zimmer Biomet; Ethicon
Stock Options/Shareholder
SpineSearch; Paradigm Spine
DePuy/Synthes; K2M
Private Investment
Paradigm Spine
Board of Directors
Spine Search
Scientific/Other Advisory Board
Other Relationships/Disclosures
Royalties: DePuy/Synthes; Zimmer Biomet; Other: SRS Spine Deformity Journal