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Stephen K. Aoki, MDSports Medicine: Surgery, Knee, Hip Arthroscopy

Dr. Stephen K. Aoki, Associate Professor, specializes in hip and knee sports medicine. His clinical practice and research focus on both adult and pediatric sports injuries. Current interests include hip preservation/femoroacetabular impingement in the young adult, hip arthroscopy, the pediatric and adolescent athlete, ACL tears in children, patellar dislocations, and ligament/cartilage knee injuries. Dr. Aoki serves as team physician for University of Utah Gymnastics and assistant team physician for University of Utah Football.

He serves as Chair of the University of Utah Residency Selection Committee. Dr. Aoki received his Bachelor of Arts degree through Harvard University. He received his medical doctorate degree from Mount Sinai School of Medicine in New York City and subsequently completed his orthopaedic residency and sports medicine fellowship at the University of Utah. Dr. Aoki practices both at the University Orthopaedic Center and Primary ChildrenĀ“s Hospital.

Surgical Expertise: Hip Arthroscopy, Femoroacetabular Impingement, Labral Repair, Gluteus Tendon Repair, Hamstring Repair, Hip Preservation, Pediatric and Adult ACL Reconstructions, Patella Dislocations, Pediatric Sports Injuries, Osteochondritis Dissecans, Cartilage and Meniscus Tears.

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Board Certification and Academic Information
Academic Departments
Orthopaedics - Associate Professor
Board Certification
American Board of Orthopaedic Surgery
Research Interests
Education History
University of Utah School of Medicine
Sports Medicine
University of Utah School of Medicine
Orthopedic Surgery
University of Utah School of Medicine
Professional Medical
Mount Sinai School of Medicine
arvard College
Selected Publications - Journal Articles
  1. Cannamela PC, Quinlan NJ, Maak TG, Adeyemi TF, Aoki SK (2019). Knee Extension Does Not Reliably Reduce Acute Type II Tibial Spine Fractures: MRI Evaluation of Displacement During Extension Versus Resting Flexion. Orthop J Sports Med, 7(7), 2325967119860066.
  2. Dukas AG, Gupta AS, Peters CL, Aoki SK (2019). Surgical Treatment for FAI: Arthroscopic and Open Techniques for Osteoplasty. Current Reviews in Musculoskeletal Medicine, 281-290.
  3. Lynch TS, Minkara A, Aoki S, Bedi A, Bharam S, Clohisy J, Harris J, Larson C, Nepple J, Nho S, Philippon M, Rosneck J, Safran M, Stubbs AJ, Westermann R, Byrd JWT (2019). Best Practice Guidelines for Hip Arthroscopy in Femoroacetabular Impingement: Results of a Delphi Process. (Epub ahead of print) J Am Acad Orthop Surg.
  4. Uemura K, Atkins PR, Anderson AE, Aoki SK (2019). Do Your Routine Radiographs to Diagnose Cam Femoroacetabular Impingement Visualize the Region of the Femoral Head-Neck Junction You Intended? Arthroscopy, 35(6), 1796-1806.
  5. Wylie JD, Peters CL, Aoki SK (2018). Natural History of Structural Hip Abnormalities and the Potential for Hip Preservation. J Am Acad Orthop Surg, 26(15), 515-525.
  6. Faucett SC, Nepple JJ, Andrade T, Aoki S, Bedi A, Bharam S, Brick MJ, Byrd JWT, Cakic JN, Cascio BM, Christoforetti J, Clohisy JC, Domb B, Dumont G, Ellman MB, Harris JD, Kelly BT, Krych AJ, LaPrade RF, Larson C, Laskowski JR, Levy BA, Lynch TS, Martin HD, Mather C 3rd, Miyamoto RG, Nho SJ, ODonnell JM, Philippon MJ, Price MR, Ranawat AS, Rodriguez MC, Safran MR, Said HG, Salata MJ, Sampson T, Stubbs AJ, Uchida S, Villar RN, Willimon SC, Wolf A, Wong I, Wuerz TH, Yen YM (2018). Randomized Controlled Trial of Hip Arthroscopy Surgery vs Physical Therapy: Letter to the Editor. Am J Sports Med, 46(8), NP35-NP38.
  7. Atkins PR, Kobayashi EF, Anderson AE, Aoki SK (2017). Modified False-Profile Radiograph of the Hip Provides Better Visualization of the Anterosuperior Femoral Head-Neck Junction. Arthroscopy, 34(4), 1236-1243.
  8. Jones DL, Philippi MT, Maak TG, Aoki SK (2018). Progressive osteoarthritis during pregnancy several years following hip arthroscopy for femoroacetabular impingement. J Orthop, 15(2), 475-479.
  9. Kapron AL, Aoki SK, Weiss JA, Krych AJ, Maak TG (2018). Isolated focal cartilage and labral defects in patients with femoroacetabular impingement syndrome may represent new, unique injury patterns.LID - 10.1007/s00167-018-4861-2 [doi]. (Epub ahead of print) Knee Surg Sports Traumatol Arthrosc.
  10. Philippi MT, Kahn TL, Adeyemi TF, Maak TG, Aoki SK (2018). Extracapsular local infiltration analgesia in hip arthroscopy: a retrospective study. J Hip Preserv Surg, 5(1), 60-65.
  11. Wylie JD, Jenkins PA, Beckmann JT, Peters CL, Aoki SK, Maak TG (2017). Computed Tomography Scans in Patients With Young Adult Hip Pain Carry a Lifetime Risk of Malignancy. Arthroscopy, 34(1), 155-163.e3.
  12. Atkins PR, Fiorentino NM, Aoki SK, Peters CL, Maak TG, Anderson AE (2017). In Vivo Measurements of the Ischiofemoral Space in Recreationally Active Participants During Dynamic Activities: A High-Speed Dual Fluoroscopy Study. Am J Sports Med, 45(12), 2901-2910.
  13. Atkins PR, Aoki SK, Whitaker RT, Weiss JA, Peters CL, Anderson AE (2017). Does Removal of Subchondral Cortical Bone Provide Sufficient Resection Depth for Treatment of Cam Femoroacetabular Impingement? Clin Orthop Relat Res, 475(8), 1977-1986.
  14. Beebe MJ, Wylie JD, Bodine BG, Kapron AL, Maak TG, Mei-Dan O, Aoki SK (2017). Accuracy and Reliability of Computed Tomography and Magnetic Resonance Imaging Compared With True Anatomic Femoral Version. J Pediatr Orthop, 37(4), e265-e270.
  15. Aoki SK, Karns MR, Hananouchi T, Todd DC (2017). Hip Arthroscopy Capsular Closure: The Figure of Eight Technique. Arthrosc Tech, 6(2), e505-e509.
  16. Wylie JD, Kapron AL, Peters CL, Aoki SK, Maak TG (2017). Relationship Between the Lateral Center-Edge Angle and 3-Dimensional Acetabular Coverage. Orthop J Sports Med, 5(4), 2325967117700589.
  17. Wylie JD, Jones DL, Hartley MK, Kapron AL, Krych AJ, Aoki SK, Maak TG (2016). Distal Femoral Osteotomy for the Valgus Knee: Medial Closing Wedge Versus Lateral Opening Wedge: A Systematic Review. Arthroscopy, 32(10), 2141-2147.
  18. Aoki SK, Beckmann JT, Wylie JD (2016). Arthroscopic Femoral Osteochondroplasty for Cam-Type Femoroacetabular Impingement: The Trough Technique. Arthrosc Tech, 5(4), e743-e749.
  19. Brandenburg JB, Kapron AL, Wylie JD, Wilkinson BG, Maak TG, Gonzalez CD, Aoki SK (2016). The Functional and Structural Outcomes of Arthroscopic Iliopsoas Release. Am J Sports Med, 44(5), 1286-91.
  20. Anderson LA, Anderson MB, Kapron A, Aoki SK, Erickson JA, Chrastil J, Grijalva R, Peters C (2016). The 2015 Frank Stinchfield Award: Radiographic Abnormalities Common in Senior Athletes With Well-functioning Hips but Not Associated With Osteoarthritis. Clin Orthop Relat Res, 474(2), 342-52.
  21. Wylie JD, Hartley MK, Kapron AL, Aoki SK, Maak TG (2016). Failures and Reoperations After Matrix-Assisted Cartilage Repair of the Knee: A Systematic Review. Arthroscopy, 32(2), 386-92.
  22. Wylie JD, Beckmann JT, Maak TG, Aoki SK (2016). Arthroscopic Capsular Repair for Symptomatic Hip Instability After Previous Hip Arthroscopic Surgery. Am J Sports Med, 44(1), 39-45.
  23. Beckmann JT, Wylie JD, Potter MQ, Maak TG, Greene TH, Aoki SK (2015). Effect of Naproxen Prophylaxis on Heterotopic Ossification Following Hip Arthroscopy: A Double-Blind Randomized Placebo-Controlled Trial. J Bone Joint Surg Am, 97(24), 2032-7.
  24. Levy DM, Grzybowski J, Salata MJ, Mather RC 3rd, Aoki SK, Nho SJ (2015). Capsular Plication for Treatment of Iatrogenic Hip Instability. Arthrosc Tech, 4(6), e625-30.
  25. Wylie JD, Beckmann JT, Aoki SK (2015). Dislocation After Hip Arthroscopy for Cam-Type Femoroacetabular Impingement Leading to Progressive Arthritis: A Case Report. JBJS Case Connect, 5(3), e80-e7.
  26. Swenson KM, Erickson J, Peters C, Aoki SK (2015). Hip pain in young adults: diagnosing femoroacetabular impingement. JAAPA, 28(9), 39-45.
  27. Kapron AL, Aoki SK, Peters CL, Anderson AE (2015). In-vivo hip arthrokinematics during supine clinical exams: Application to the study of femoroacetabular impingement. J Biomech, 48(11), 2879-86.
  28. Hanson JA, Kapron AL, Swenson KM, Maak TG, Peters CL, Aoki SK (2015). Discrepancies in measuring acetabular coverage: revisiting the anterior and lateral center edge angles. J Hip Preserv Surg, 2(3), 280-6.
  29. Shea KG, Polousky JD, Jacobs JC Jr, Ganley TJ, Aoki SK, Grimm NL, Parikh SN (2015). The patellar insertion of the medial patellofemoral ligament in children: a cadaveric study. J Pediatr Orthop, 35(4), e31-5.
  30. Kapron AL, Peters CL, Aoki SK, Beckmann JT, Erickson JA, Anderson MB, Pelt CE (2015). The prevalence of radiographic findings of structural hip deformities in female collegiate athletes. Am J Sports Med, 43(6), 1324-30.
  31. Wylie JD, Abtahi AM, Beckmann JT, Maak TG, Aoki SK (2015). Arthroscopic and imaging findings after traumatic hip dislocation in patients younger than 25 years of age. J Hip Preserv Surg, 2(3), 303-9.
  32. Haller JM, Beckmann JT, Kapron AL, Aoki SK (2015). Detection of a traumatic arthrotomy in the pediatric knee using the saline solution load test. J Bone Joint Surg Am, 97(10), 846-9.
  33. Wylie JD, Hartley MK, Kapron AL, Aoki SK, Maak TG (2015). What is the effect of matrices on cartilage repair? A systematic review. Clin Orthop Relat Res, 473(5), 1673-82.
  34. Wylie JD, Beckmann JT, Maak TG, Aoki SK (2015). Arthroscopic treatment of mild to moderate deformity after slipped capital femoral epiphysis: intra-operative findings and functional outcomes. Arthroscopy, 31(2), 247-53.
  35. Kullar RS, Kapron AL, Ihnat D, Aoki SK, Maak TG (2015). Acetabular paralabral cyst: an unusual cause of femoral vein compression. Arthrosc Tech, 4(1), e35-40.
  36. Hung M, Hon SD, Cheng C, Franklin JD, Aoki SK, Anderson MB, Kapron AL, Peters CL, Pelt CE (2014). Psychometric Evaluation of the Lower Extremity Computerized Adaptive Test, the Modified Harris Hip Score, and the Hip Outcome Score. Orthop J Sports Med, 2(12), 2325967114562191.
  37. Shea KG, Polousky JD, Jacobs JC Jr, Ganley TJ, Aoki SK, Grimm NL, Parikh SN (2014). The relationship of the femoral physis and the medial patellofemoral ligament in children: a cadaveric study. J Pediatr Orthop, 34(8), 808-13.
  38. Kapron AL, Aoki SK, Peters CL, Anderson AE (2014). Subject-specific patterns of femur-labrum contact are complex and vary in asymptomatic hips and hips with femoroacetabular impingement. Clin Orthop Relat Res, 472(12), 3912-22.
  39. Jimenez CL, Beebe MJ, Maak TG, Aoki SK (2014). Acute severe hip pain associated with labral calcific deposition disease. Orthopedics, 37(12), e1137-40.
  40. Kapron AL, Aoki SK, Peters CL, Maas SA, Bey MJ, Zauel R, Anderson AE (2014). Accuracy and feasibility of dual fluoroscopy and model-based tracking to quantify in vivo hip kinematics during clinical exams. J Appl Biomech, 30(3), 461-70.
  41. Beckmann JT, Wylie JD, Kapron AL, Hanson JA, Maak TG, Aoki SK (2014). The Effect of NSAID Prophylaxis and Operative Variables on Heterotopic Ossification After Hip Arthroscopy. Am J Sports Med, 42(6), 1359-64.
  42. Potter MQ, Wylie JD, Sun GS, Beckmann JT, Aoki SK (2014). Psychologic distress reduces preoperative self-assessment scores in femoroacetabular impingement patients. Clin Orthop Relat Res, 472(6), 1886-92.
  43. Grimm NL, Weiss JM, Kessler JI, Aoki SK (2014). Osteochondritis dissecans of the knee: pathoanatomy, epidemiology, and diagnosis. Clin Sports Med, 33(2), 181-8.
  44. Potter MQ, Sun GS, Fraser JA, Beckmann JT, Swenson JD, Maak TG, Aoki SK (2014). Psychological distress in hip arthroscopy patients affects postoperative pain control. Arthroscopy, 30(2), 195-201.
  45. Price SL, Farukhi MA, Jones KB, Aoki SK, Randall RL (2013). Complications of cemented long-stem hip arthroplasty in metastatic bone disease revisited. Clin Orthop Relat Res, 471(10), 3303-7.
  46. Rothberg DL, Kubiak EN, Peters CL, Randall RL, Aoki SK (2013). Reducing the risk of bone cement implantation syndrome during femoral arthroplasty. Orthopedics, 36(4), e463-7.
  47. Aoki SK, Grimm NL, Ewing CK, Klatt JB, Shea KG (2013). Metaphyseal Screw Migration After Medial Patellofemoral Ligament Reconstruction in a Skeletally Immature Patient: A Case Report. JBJS Case Connect, 3(1), e28.
  48. Grimm NL, Shea KG, Leaver RW, Aoki SK, Carey JL (2012). Efficacy and degree of bias in knee injury prevention studies: a systematic review of RCTs. Clin Orthop Relat Res, 471(1), 308-16.
  49. Anderson LA, Kapron AL, Aoki SK, Peters CL (2012). Coxa profunda: is the deep acetabulum overcovered? Clin Orthop Relat Res, 470(12), 3375-82.
  50. Peters CL, Aoki SK, Erickson JA, Anderson LA, Anderson AE (2012). Early experience with a comprehensive hip preservation service intended to improve clinical care, education, and academic productivity. Clin Orthop Relat Res, 470(12), 3446-52.
  51. Kapron AL, Anderson AE, Peters CL, Phillips LG, Stoddard GJ, Petron DJ, Toth R, Aoki SK (2012). Hip internal rotation is correlated to radiographic findings of cam femoroacetabular impingement in collegiate football players. Arthroscopy, 28(11), 1661-70.
  52. Davis JJ, Swenson JD, Kelly S, Abraham CL, Aoki SK (2012). Anatomic changes in the inguinal region after hip arthroscopy: implications for femoral nerve block. J Clin Anesth, 24(7), 590-2.
  53. Aoki SK, Beckmann JT, Wylie JD (2012). Hip arthroscopy and the anterolateral portal: avoiding labral penetration and femoral articular injuries. Arthrosc Tech, 1(2), e155-60.
  54. Wilcox JJ, Snow BJ, Aoki SK, Hung M, Burks RT (2012). Does landmark selection affect the reliability of tibial tubercle-trochlear groove measurements using MRI? Clin Orthop Relat Res, 470(8), 2253-60.
  55. Klatt JB, Aoki SK (2012). The location of the medial humeral epicondyle in children: position based on common radiographic landmarks. J Pediatr Orthop, 32(5), 477-82.
  56. Aoki SK, Curtis SH (2011). Biomechanical evaluation of tibial eminence fractures using suture fixation. Orthopedics, 34(12), e866-70.
  57. Kapron AL, Anderson AE, Aoki SK, Phillips LG, Petron DJ, Toth R, Peters CL (2011). Radiographic prevalence of femoroacetabular impingement in collegiate football players: AAOS Exhibit Selection. J Bone Joint Surg Am, 93(19), e111(1-10).
  58. Shea KG, Grimm NL, Ewing CK, Aoki SK (2011). Youth sports anterior cruciate ligament and knee injury epidemiology: who is getting injured? In what sports? When? Clin Sports Med, 30(4), 691-706.
  59. Aoki SK, Anderson LA, Marchese JW (2011). Recession wedge osteotomy of the greater tuberosity for proximal humeral varus. Orthopedics, 34(5), 398.
  60. Gililland JM, Webber NP, Jones KB, Randall RL, Aoki SK (2011). Intratendinous tophaceous gout imitating patellar tendonitis in an athletic man. Orthopedics, 34(3), 223.
  61. Hamblin T, Curtis SH, DAstous J, Aoki SK (2010). Childhood obesity and low-velocity knee dislocation in a fifteen-year-old girl: a case report. J Bone Joint Surg Am, 92(12), 2216-9.
  62. Petron DJ, Greis PE, Aoki SK, Black S, Krete D, Sohagia KB, Burks R (2012). Use of knee magnetic resonance imaging by primary care physicians in patients aged 40 years and older. Sports Health: a multidisciplinary approach, 2(5), 385-90.
  63. Stevens PM, Aoki S, Olson P (2006). Ball-and-socket ankle. J Pediatr Orthop, 26(4), 427-31.
  64. Randall RL, Aoki SK, Olson PR, Bott SI (2006). Complications of cemented long-stem hip arthroplasties in metastatic bone disease. Clin Orthop Relat Res, 443, 287-95.
Book Chapter
  1. Beckmann JT, Maak TG, Aoki SK (1/1/2015). Hip Arthroscopy: Peritrochanteric Space Access. In Nho SJ, Leunig M, Larson CM, Bedi A, Kelly BT (Eds.), Hip Arthroscopy and Hip Preservation Surgery (1st). Springer.
Case Report