Dr. Joseph Mejia, DO, FAAPRM&R, RMSK has been selected as a Castle Connolly Top Doctor in the field of orthopedic and regenerative medicine. Triple board certified in Physical Medicine and Rehabilitation, Interventional Pain Management and Sports Medicine, Dr. Mejia offers vast experience and expertise in nonsurgical orthopedic medicine.                                     

Dr. Mejia serves as the medical director at Performance Rehabilitation & Regenerative Medicine in Somerset County alongside Dr. Ronald Spiaggia, the founding partner of the practice. In addition to receiving extensive training in Regenerative Medicine, Dr. Mejia is fellowship-trained in Interventional Pain/Musculoskeletal Medicine and is licensed in both New Jersey and New York.  He also is certified in diagnostic musculoskeletal ultrasound and has received comprehensive training in Regenerative Medicine for advanced spine conditions. Dr. Mejia is known as a pioneer in Regenerative Medicine, having been published in multiple projects and publications, and conducting highly sought-after courses and workshops.

Dr. Mejia completed his undergraduate degree at the University of Michigan, Ann Arbor, where he received a Bachelor of Science degree in biology. He then earned a medical degree at the West Virginia School of Osteopathic Medicine. After completing his residency at New York University/Rusk Institute of Rehabilitation, he received fellowship training in Interventional Pain/Musculoskeletal Medicine at UMDNJ/Kessler Institute for Rehabilitation. He currently resides in Wayne, N.J., with his wife and four children. He is a dedicated family man with interests in traveling, photography, computers and playing basketball.

As founding partners of Performance Rehabilitation & Regenerative Medicine, Dr. Mejia and Dr. Spiaggia have pioneered new approaches to orthopedic treatments, sports injuries, acute and chronic spine-related disorders, herniated discs, radiculopathy, spinal cord injuries, acute and chronic joint injuries, osteoarthritis, rotator cuff tears, meniscus tears, tendinopathies, ligament tears and nerve entrapments.

“At Performance Rehabilitation & Regenerative Medicine we strive to get to the root cause of people’s spine and joint pain,” Dr. Mejia said. “Our clinic uses a proven, team-based approach that gets results.  Our state-of-the-art facilities allow patients to consult with medical physicians, physical therapists, occupational therapists, acupuncturists, neurosurgeons, and orthopedic surgeons, all under one roof.”

Performance Rehabilitation & Regenerative Medicine maintains offices in Watchung, Branchburg and Somerset to reach patients across New Jersey. Dr. Mejia and the Performance Rehabilitation & Regenerative Medicine team recently opened a new surgery and pain management center in Bridgewater.

“I strive to reduce or eliminate pain for my patients and return them to their prior level of function so they can get back to doing what they love,” Dr. Mejia commented.  “I utilize the latest imaging technology to diagnose and guide specific treatments for their condition with the highest level of precision.  I listen to my patients and collaborate with other health care professionals, when necessary, to work toward a common goal of improving quality of life.”

Performance Rehabilitation and Medicine has served more the 30,000 patients over the past 21 years. To learn more about Dr. Mejia and Performance Rehabilitation & Regenerative Medicine or to book an appointment visit performancerehabnj.com or call 908-754-1960.


3150 US-22
Branchburg, NJ 08876


454 Elizabeth Ave #240
Somerset, NJ 08873


459 Watchung Ave
Watchung, NJ 07069

Surgical Center

1081 US 22 #201
Bridgewater, NJ 08807

Business Operations

1011 US-22 #203
Bridgewater, NJ 08873