Our Team

Our Physician Assistants

All of our doctors work with physician assistants (referred to as PAs) in order to provide the best possible care for their patients. PAs are an integral part of our orthopedic team as they help to treat and diagnosis patients in ouroffice and in the hospital. OSS PAs also assist the orthopedic doctors perform surgeries.

OSS PAs have the following responsibilities:

  • Record patient’s medical history
  • Perform physical exams
  • Perform and order tests
  • Educate on musculoskeletal health
  • Administer injections to minimize joint pain
  • Prescribe medications

Physician Assistant Training: To become a PA, one needs to complete six years of combined undergraduate and graduate education. Some complete an additional year of training to specialize in a specific area of medicine. After their training, PAs must pass a board certification exam prior to entering a practice. They also carry their own malpractice insurance, as well as their own license to prescribe medications.

Our PAs have trained on the intricacies of musculoskeletal health for more than six years. They are highly skilled professionals who exercise autonomy in diagnosing and treating illnesses the same as their physician counterparts. Our PA’s evaluate and treat more orthopedic patients in a year than all of the local urgent cares and emergency rooms combined. Hence, they are more experienced in the management of orthopedic conditions than many non-orthopedic medical doctors.


Vaz Galstjan, P.A.-C

Galstian YazVaz Galstjan is a Board Certified Physician Assistant (PA-C) in the state of California. He has many years of experience as an Orthopaedic PA starting his career in 2004, as well as many years of experience in the operating room prior to becoming a PA-C.

He graduated from Charles Drew University of Medicine and immediately went into the field of orthopaedics where he trained and worked with many orthopaedists in the San Fernando Valley. Mr. Galstjan is a member of California Academy of Physician Assistants and American Academy of Physician Assistants.


Omar Duenes, P.A.-C

Duenes OmarOmar Duenes is a Board Certified Physician Assistant (PA-C) in the state of California. He completed his undergraduate degree at California State Polytechnic University, Pomona. He then went onto Western University to complete a two-year Masters Degree at Western University, followed by a one-year postgraduate residency program in Orthopaedics at Arrowhead Regional Medical Center.

Mr. Duenes received his license as an Orthopaedic PA In 2005. After his training, Mr. Duenes immediately went into the field of orthopedics where he worked with many orthopedic doctors in the Inland Empire. Mr. Duenes is a member of California Academy of Physician Assistants and American Academy of Physician Assistants.


Justin Cahn, P.A.-C

Cahn JustinJustin Cahn is a Board Certified Physician Assistant (PA-C) in the state of California.  He completed his undergraduate degree in Kinesiology at California State University Northridge.  Before completing the PA Masters program at Loma Linda University, Justin worked for two years as a physical therapy aide at the Motion Picture Hospital in Woodlands Hills, where his interest in orthopedics and sports medicine developed.

Justin is proud to be a member of the orthopedic team and looks forward to providing quality health care to his community. Justin is a member of California Academy of Physician Assistants and American Academy of Physician Assistants.