Photo: Joseph R. Mendelis, MD

Joseph R. Mendelis, MD

Specializes in Orthopedic Spine Surgery, Complex, Minimally Invasive, and Robotic Spine Surgery


Fellowship-Trained Orthopedic Spine Surgeon

As a fellowship-trained orthopedic spine surgeon, Dr. Joseph Mendelis specializes in surgical and nonsurgical treatments for spine-related pain, injuries, and other conditions. Dr. Mendelis offers advanced expertise in the latest procedures and techniques, including disc replacement, fusion, disc removal, and deformity correction as well as complex and revision spine surgery. In treating patients, he utilizes the most current technology, such as microsurgery, navigation, and robotics. 

Dr. Mendelis is a Sherman Oaks native and a graduate of California State University, Northridge. He earned his medical degree at Sidney Kimmel Medical College at Thomas Jefferson University in Philadelphia, Pennsylvania. He then completed his residency training in orthopedic surgery at Montefiore Medical Center in the Bronx, New York. Following residency, Dr. Mendelis completed advanced specialty training in spine surgery through a yearlong fellowship at University of California San Francisco Medical Center.

When caring for patients, Dr. Mendelis’ goal is to successfully guide each patient through the complex process of improving their spine health using a tailored treatment plan that is right for them. When necessary, he offers the latest solutions in spine surgery, which can have a dramatic impact on a person’s well-being. He is dedicated to helping his patients improve their quality of life and regain function. 

Outside of his practice, Dr. Mendelis enjoys cycling, music, and spending time with his family.

Dr. Mendelis is available to see patients experiencing spine-related pain and limitation in Simi Valley, Thousand Oaks, and Porter Ranch.


  • Anterior Cervical Discectomy and Fusion
  • Anterior Lumbar Interbody Fusion
  • Cervical Disc Replacement
  • Cervical Foraminotomy, Laminectomy, and Laminoplasty
  • Cervical Spinal Fusion
  • Complex Spine Surgery
  • Kyphoplasty
  • Lateral Lumbar Interbody Fusion
  • Lumbar Disc Replacement
  • Lumbar Discectomy, Fusion, and Laminectomy
  • Microdiscectomy
  • Minimally Invasive Spine Surgery
  • Oblique Lumbar Interbody Fusion
  • Revision Spinal Surgery
  • Spinal Deformity Correction
  • Thoracic Fusion and Laminectomy
  • Transforaminal Lumbar Interbody Fusion