Welcome to Advanced Orthopaedic Specialists

Serving the Northwest Arkansas area for a combined 90+ years with a history of success for the treatment of knee pain, shoulder pain, hip pain, and other extremity areas. Our mission is to eliminate your pain and restore your function utilizing modern techniques in a caring environment.

Dr. Christopher Arnold, Dr. Mark Powell, Dr. Terry Sites, Dr. Casey Wagner, Dr. David Yakin, and Dr. Ramon Ylanan are the Advanced Orthopaedic Specialists – a group of orthopaedic surgeons and primary care sports medicine practices with advanced fellowship training. AOS has a combined 90 year history of success in the practice of sports medicine, joint replacement, shoulder repair, knee reconstruction, cartilage restoration, fracture care, and more.

We are experts in the areas of minimally invasive techniques and most surgeries are performed on an outpatient basis at the Physicians’ Specialty Hospital (PSH). PSH is a unique state of the art surgical facility devoted to only a few specialty areas and allows focused care that can not be matched by large general hospitals. We are proud to be recognized by the University of Arkansas for our accomplishments and grateful to be the exclusive providers of orthopaedic care for all Razorback athletes.

We are grateful you would consider AOS to be your orthopaedic choice. We will be carefully devoted to you from initial evaluation, to treatment, and throughout the process of recovery.

Please call us today for appointment services. No referral needed. Most insurance accepted.

Our Mission Statement:

Advanced Orthopaedic Specialists serves to have a positive impact on the lives of Northwest Arkansas and beyond by improving our patient’s overall wellbeing through their orthopaedic health.

Meet Our Doctors


Arnold, MD


Powell, MD


Sites, MD


Wagner, MD


Yakin, MD


Ylanan, MD

The Razorbacks trust us and so can you

Official Orthopaedic & Sports Medicine Provider for the Arkansas Razorbacks