Helping you do what you love on your feet

Dr. Tonya An

Dr. Tonya An is a fellowship-trained orthopaedic surgeon and foot and ankle surgeon. She serves as an attending orthopedic surgeon for the Southern California Permanente Medical Group (SCPMG) and provides subspecialty care for Kaiser Permanente-Orange County.

Dr. An completed residency at Cedars-Sinai Medical Center in Los Angeles and continued to the Hospital for Special Surgery in New York City, rated #1 hospital in the nation for orthopedic surgery, to gain advanced skills in foot and ankle care. She has previously practiced as an assistant clinical professor for Stanford University Department of Orthopaedics.

She has experience in both surgical and non-surgical treatment of foot and ankle conditions, including sports injury, flatfoot deformity and ankle arthritis. Working with world-class experts in the field, Dr. An is trained in the latest generation techniques and technology, from cartilage repair, minimally-invasive bunion correction, to total ankle replacement.

What is a foot and ankle surgeon?

I am proud to be an MD. Beyond my specialty of orthopedic surgery and my subspecialty in the Foot and Ankle, I am a doctor first. I want to understand your overall health, including conditions like diabetes, obesity, and vascular disease that impact the lower extremities.

As an orthopedic surgeon, I am passionate about caring for the body as a whole. My background gives me a deep understanding of musculoskeletal conditions from the fingertips to the spine. While focusing on your foot or ankle problem, I will be able to diagnose contributing issues and help you find the right subspecialist doctor to take care of it.

I pursued an ACGME-accredited fellowship in foot and ankle surgery, which is the highest-level training experience in conditions of the lower extremity. This allowed me to learn specialized techniques like total ankle replacement, autograft tendon reconstructions and minimally invasive surgery, which general orthopedic surgeons rarely do. Fellowship made me appreciate more than ever the unique, powerful and dynamic nature of our feet and the importance of properly taking care of them.

CV

Cedars-Sinai Orthopaedic Surgery Department Best Senior Research Paper Award
Cedars-Sinai Orthopaedic Surgery Department Senior Resident Teaching Award
Rigler Award for Resident Excellence
Cedars-Sinai Orthopaedic Surgery Department Junior Resident Teaching Award
AOFAS Resident Grant
Best Clinical Paper Award. Orthopedic Summit for Evolving Technologies, Las Vegas, NV.
Washington University in St. Louis Summa cum laude
Skandalaris Center Certificate in Entrepreneurship
Washington University in St. Louis Woodward Engineering Scholarship
Rajan L, Kim J, An, T, et. al. “Effect of prior cheilectomy on outcomes of first metatarsophalangeal joint fusion for treatment of hallux rigidus.” FAO. 2022 Aug 23;7(3). PMID 36046554.
An T, Fuller R, Rajan L, et. al. "Clinical outcomes and rotational correction of modified Lapidus with first metatarsal to intermediate cuneiform fixation". FAO. Accepted.
Fuller R, Kim J, An T, et. al. "Assessment of Flatfoot Deformity using Digitally Reconstructed Radiographs: Reliability and Comparison to Conventional Radiographs". FAI 2022 Jul;43(7):983-993. PMID 35590471.
An T, Schwartz E, Pollock G, Kissen M, Pfeffer G. Safety and efficacy of perioperative popliteal nerve catheter for Charcot-Marie-Tooth Surgical Correction. Foot Ankle Int. 2022 Apr;43(4):504-508. PMID 34889125.
An T, Haupt E, Michalski M, Salo J, Pfeffer G. Cavovarus with a twist. Midfoot coronal plane rotational deformity in Charcot-Marie-Tooth Patients. Foot Ankle Int. 2022 May;43(5):676-682. PMID 35037521.
Michalski M, An T, Haupt E, Salo J, Pfeffer G. Use of Weight-Bearing Computed Tomography to Quantify the Osseous Morphology of the Hindfoot in Charcot-Marie-Tooth Disease. Foot Ankle Int. 2022 May;43(5):676-682. PMID 35037521.
An T, Henry J, Igboechi O, Wang P, Yerrapragada A, Lin CA, Paiement G. How Are Orthopaedic Surgery Residencies Responding to the COVID-19 Pandemic? An Assessment of Resident Experiences in Cities of Major Virus Outbreak. J Am Acad Orthop Surg. 2020 Aug 1;28(15). PMID: 32732660
Pfeffer G, An T, et. al. A Consensus Statement on the Surgical Treatment of Charcot-Marie-Tooth Disease. Foot Ankle Int. In press. PMID: 32478578
Pfeffer G, Michalski M, Nelson T, An T, Metzger M. Extensor Tendon Transfers for Treatment of Foot Drop in Charcot-Marie-Tooth Disease: A Biomechanical Evaluation. Foot Ankle Int. In press
An T, Cassinelli S, Charlton T, Pfeffer G, Thordarson D. Radiographic and magnetic resonance imaging of the symptomatic Cartiva synthetic cartilage implant. Foot Ankle Int. July 2019. PMID 31538827.
An T, Michalski M, Jansson K, Pfeffer G. Comparison of lateralizing calcaneal osteotomies for hindfoot varus correction. Foot Ankle Int. Oct 2018. PMID 30011380.
An T, Shin S. Treatment of thumb metacarpophalangeal joint hyperextension by volar plate advancement and capsulodesis with suture tape augmentation. HAND. Aug 2019.
An T, Garlich G, Kulber D. Yoga-induced myositis ossificans traumatica of the scapholunate ligament. J Wrist Surg. Feb 2019. PMID 30723608.
Nepple J, Thomason K, An T, Harris-Hayes M, Clohisy JC. What Is the Utility of Biomarkers for Assessing the Pathophysiology of Hip Osteoarthritis? A Systematic Review. Clin Orthop Relat Res. May 2015. PMID 25623593.
Wang P, Stepan J, An T, Osei D. Equivalent clinical outcomes following favored treatments of chronic scapholunate ligament tear. HSS Journal. Oct 2016. PMID 28690470.
An T, Boone S, Boyer M, Gelberman R, Calfee R. The effect of ice on pain after corticosteroid injection in the wrist and hand: a randomized controlled trial. J Hand Surg Eur. Nov 2016. PMID 27402283.
An T, Boyer M, Evanoff B, Osei D. The prevalence of cubital tunnel syndrome: a cross-sectional study in a US metropolitan cohort. J Bone Joint Surg Am. Mar 2017. PMID 28244912.
Haynes J, Pascual-Garrido C, An T, Nepple J, ANCHOR Group Clohisy J. Trends of hip arthroscopy in the setting of acetabular dysplasia. J Hip Preservation Surg. Sept 2018. PMID 30393554.
Haynes J, Xiong A, Nepple, J, An T, Nunley R, Clohisy J. Does Previous Hip Arthroscopy Affect The Clinical Outcomes Of Total Hip Arthroplasty? Orthop J of Sports Med. March 2019. PMID 30886875.
Dardas A, Stockburger C, Boone S, An T, Calfee RP. Preferences for shared decision making in older adult patients with orthopedic hand conditions. J Hand Surg Am. Oct 2016. PMID 27524694.
An T, Haupt E, Michalski M, Salo J, Pfeffer G. Cavovarus with a twist. Midfoot coronal plane rotational deformity in Charcot-Marie-Tooth Patients. Podium presentation at AOFAS Annual Meeting. Charlotte, NC. Sept 2021.
Michalski M, An T, Haupt E, Salo J, Pfeffer G. Use of Weight-Bearing Computed Tomography to Quantify the Osseous Morphology of the Hindfoot in Charcot-Marie-Tooth Disease. Podium presentation at AOFAS Annual Meeting. Charlotte, NC. Sept 2021. Semi-Finalist for Roger Mann Award.
An T, Schwartz E, Kissen M, Pollock G, Pfeffer G. Popliteal nerve catheters for perioperative pain control in Charcot-Marie-Tooth patients. Poster presentation at AOFAS Annual Meeting. Charlotte, NC. Sept 2021.
Schwartz E, An T, Kissen M, Pfeffer G, Pollock G. Safety and efficacy of perioperative popliteal nerve catheter for Charcot-Marie-Tooth Surgical Correction. Poster presentation at the Association of Regional Anesthesiology Annual Meeting. Orlando, FL. May 2021.
An T, Haupt E, Michalski M, Salo J, Pfeffer G. Cavovarus with a twist. Midfoot coronal plane rotational deformity in Charcot-Marie-Tooth Patients. Cedars-Sinai Annual Research Day. Los Angeles, CA. June 2021.
An T, Cassinelli S, Charlton T, Pfeffer G, Thordarson D. Radiographic and magnetic resonance imaging of the symptomatic Cartiva synthetic cartilage implant. E-poster presentation at the AOFAS Annual Meeting. June 2020.
Pfeffer G, Michalski M, Nelson T, An T, Metzger M. Extensor Tendon Transfers for Treatment of Foot Drop in Charcot-Marie-Tooth Disease: A Biomechanical Evaluation. Orthopaedic Research Society Annual Meeting. San Antonio, TX. Feb 2020.
An T, Cassinelli S, Charlton T, Pfeffer G, Thordarson D. Radiographic and magnetic resonance imaging of the symptomatic Cartiva synthetic cartilage implant. Presented at the Combined Australia and New Zealand Foot and Ankle Society annual meeting. Brisbane, Australia. Aug 2019.
An T, Michalski M, Jansson K, Pfeffer G. Lateralizing calcaneal osteotomies for hindfoot varus correction in Charcot-Marie-Tooth disease. Poster at AAOS Annual Meeting 2019. Las Vegas, NV. Mar 2019.
An T, Michalski M, Jansson K, Pfeffer G. Comparison of lateralizing calcaneal osteotomies for hindfoot varus correction. Podium at Orthopedic Summit for Evolving Techniques 2018 Annual Meeting. Las Vegas, NV. Dec 2018.
An T, Michalski M, Jansson K, Pfeffer G. Comparison of lateralizing calcaneal osteotomies for hindfoot varus correction. Podium at Western Orthopedic Association 2018 Annual Meeting. Snowmass, CO. Aug 2018.
An T, Boone S, Boyer M, Gelberman R, Calfee R. Effect of Ice on Pain after Corticosteroid Injection in the Hand and Wrist: A Randomized Controlled Trial. Poster presented at Hand Society 2016 annual meeting. Austin, TX.
Haynes J, An T, Nepple J, Clohisy, J. Hip Arthroscopy Failure in the Setting of Acetabular Dysplasia: A Concerning Trend? Podium presented at American Academy of Orthopaedic Surgeons 2016 annual meeting. Orlando, FL. Mar 2016.
Haynes J, An T, Nepple J, Clohisy, J. Hip Arthroscopy Failure in the Setting of Acetabular Dysplasia: A Concerning Trend? Podium presented at American Academy of Hip and Knee Surgeons 2016 annual symposium. Dallas, TX. Nov 2016.
Xiong A, An T, Baca G, Haynes J, Clohisy J. Does previous hip arthroscopy impact clinical outcomes of total hip arthroplasty? A matched cohort study. Poster presented at: American Association of Hip and Knee Surgeons annual symposium. Dallas, TX. Nov 2014.
American Academy of Orthopaedic Surgeons (AAOS)
American Orthopaedic Foot and Ankle Society (AOFAS)
California Orthopaedic Association (COA)
Ruth Jackson Orthopedic Society (RJOS)
Western Orthopedic Association (WOA)