About Dr. Matthew Siljander
Dr. Matthew Siljander is a board-certified orthopedic surgeon whose clinical career has focused primarily on hip and knee reconstruction. His surgical background includes total hip replacement, total knee replacement, revision joint procedures, and management of advanced degenerative joint disease.
Before entering medicine, Dr. Siljander earned a degree in Mechanical Engineering from the University of Michigan. That engineering background was followed by medical school, orthopedic residency, and advanced fellowship training devoted specifically to lower-extremity adult reconstruction.
For more than a decade, he trained and worked in orthopedic surgery, eventually building a joint-replacement practice in Southern California. In 2026, Dr. Siljander publicly explained that a medical diagnosis required him to leave the operating room earlier than he had planned. He continues contributing to orthopedics through clinical research and other professional projects rather than currently operating on patients.
Patients seeking a currently practicing specialist can browse the Doctiplus Orthopedics directory.
Focus Areas
- Hip osteoarthritis
- Knee osteoarthritis
- Degenerative joint disease
- Total hip replacement
- Total knee replacement
- Adult joint reconstruction
- Revision joint replacement
- Joint pain and stiffness
- Reduced mobility
- Complex hip and knee conditions
- Joint-replacement outcomes
- Orthopedic clinical research
Osteoarthritis is a common reason people develop progressive hip or knee pain, stiffness, and difficulty with everyday movement. The National Institute of Arthritis and Musculoskeletal and Skin Diseases provides patient information about osteoarthritis, including diagnosis and established treatment options.
Patients considering surgical treatment can also review the NIAMS overview of hip replacement surgery.
Hip and Knee Reconstruction Background
Adult reconstruction concentrates on restoring function in severely damaged hip and knee joints. Treatment does not automatically begin with surgery. Evaluation normally considers symptoms, X-rays, mobility, activity level, previous treatments, and how significantly the joint problem affects everyday life.
Before leaving operative practice, Dr. Siljander’s work centered heavily on hip and knee replacement. His published research has also examined outcomes following total hip and knee arthroplasty, including implant-related complications and patient factors that may influence recovery or readmission.
Depending on the diagnosis, non-surgical treatment for arthritis may include exercise, physical therapy, activity modification, medication, injections, and weight-management strategies when medically appropriate. Joint replacement may be considered when significant structural damage and symptoms continue despite reasonable conservative treatment.
Education and Credentials
Dr. Siljander earned a Bachelor of Science in Mechanical Engineering from the University of Michigan before completing his MD at Chicago Medical School at Rosalind Franklin University of Medicine and Science in 2014.
He completed Orthopaedic Surgery residency at Beaumont Health, now part of Corewell Health, from 2015 to 2019. He then completed a Lower Extremity Adult Reconstruction fellowship at Mayo Clinic in Rochester, Minnesota, from 2019 to 2020.
He is certified in Orthopaedic Surgery by the American Board of Orthopaedic Surgery. His active National Provider Identifier is 1831509355, with Adult Reconstructive Orthopaedic Surgery recorded as his primary taxonomy and California license A167823 attached to the NPI record.
Current Professional Status
Historical provider directories list Dr. Siljander with Newport Orthopedic Institute and Hoag Orthopedic Institute in Newport Beach and Irvine. Those listings reflect his established orthopedic career but should not be interpreted as confirmation that he is currently accepting surgical patients.
As of 2026, Dr. Siljander states that he is no longer operating. His current work includes clinical research with the Hoag Orthopedics Foundation, writing, and other professional projects outside the operating room.
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