Sports Medicine and Hip Preservation Clinical Research


AJSM FAI Improvement Research Paper Summary - Alan Zhang, MD

Alan Zhang, MD, gives a summary for "When Do Patients Improve After Hip Arthroscopy for Femoroacetabular Impingement? A Prospective Cohort Analysis." for AJSM.


Our clinical research

Our team performs leading research in hip preservation and receives competitive grant funding from sources such as the National Institutes of Health (NIH/NIAMS). We specialize in using advanced imaging protocols to assess cartilage health in the hip.

Current on-going investigations include:

  • Advanced MR Imaging for assessment of cartilage health of the hip
  • Effects of hip arthroscopy on cartilage health of the hip and prevention of arthritis  
  • Biomechanical analysis of patients with FAI and early arthritis
  • Outcomes of hip arthroscopy and pelvic osteotomy treatments
  • Effects of local nerve blocks for pain control after hip procedures
  • National database analysis of trends in hip preservation
  • Outcomes of hip arthroplasty

Current projects

  • Patient outcomes after hip arthroscopy surgery
  • Cartilage health after hip surgery
  • Hip capsule characteristics and patient symptoms
  • Effects of biologics on early hip arthritis
  • Advancing surgical techniques for hip arthroscopy surgery


Recent publications

  1. Flores SE, Sheridan JR, Borak KR, Zhang ALWhen Do Patients Improve After Hip Arthroscopy for Femoroacetabular Impingement? A Prospective Cohort Analysis. Am J Sports Med. 2018 Sep 18:363546518795696. doi: 10.1177/0363546518795696. PMID: 30226992. 
  2. Hodax JD, Flores SE, Cheung EC, Zhang ALUse of Air Arthrograms to Aid in Joint Distraction During Hip Arthroscopic Surgery Decreases Postoperative Pain and Opioid Requirements. Orthop J Sports Med. 2019 Apr 10;7(4):2325967119837389. doi: 10.1177/2325967119837389.
  3. Chambers CC, Monroe EJ, Flores SE, Borak KR, Zhang AL. Periportal Capsulotomy: Technique and Outcomes for a Limited Capsulotomy During Hip Arthroscopy. Arthroscopy. 2019 Mar 11. pii: S0749-8063(18)31028-4. doi: 10.1016/j.arthro.2018.10.142.
  4. Monroe EJ, Chambers CC, Zhang AL. Periportal Capsulotomy: A Technique for Limited Violation of the Hip Capsule During Arthroscopy for Femoroacetabular Impingement. Arthrosc Tech. 2019 Jan 28;8(2):e205-e208. doi: 10.1016/j.eats.2018.10.015. eCollection 2019 Feb.
  5. Zhang AL, Feeley BT. Editorial Commentary: The Rise of Hip Arthroscopy: Temporary Trend or Here to Stay? Arthroscopy. 2018 Jun;34(6):1831-1832. doi: 10.1016/j.arthro.2018.02.023. PMID: 29804605.
  6. Samaan MA, Zhang AL, Popovic T, Pedoia V, Majumdar S, Souza RB. Hip joint muscle forces during gait in patients with femoroacetabular impingement syndrome are associated with patient reported outcomes and cartilage composition. J Biomech. 2018 Dec 23. pii: S0021-9290(18)30924-2. doi: 10.1016/j.jbiomech.2018.12.026. PMID: 30600097
  7. Neumann J, Zhang AL, Schwaiger BJ, Samaan MA, Souza R, Foreman SC, Joseph GB, Grace T, Majumdar S, Link TM. Validation of scoring hip osteoarthritis with MRI (SHOMRI) scores using hip arthroscopy as a standard of reference. Eur Radiol. 2018 Jul 9. doi: 10.1007/s00330-018-5623-8. PMID: 29987419.
  8. Flores SE, Chambers C, Borak KR, Zhang AL. Arthroscopic Treatment of Acetabular Retroversion with Acetabuloplasty and Subspine Decompression: A Matched Comparison with Patients Undergoing Arthroscopic Treatment for Focal Pincer-type FAI. Orthop J Sports Med. 2018 Jul 11;6(7):2325967118783741. doi: 10.1177/2325967118783741. PMID: 30046631.
  9. Grace T, Samaan MA, Souza RB, Link TM, Majumdar S, Zhang AL. Correlation of Patient Symptoms With Labral and Articular Cartilage Damage in Femoroacetabular Impingement. Orthop J Sports Med. 2018 Jun 15;6(6):2325967118778785. doi: 10.1177/2325967118778785. PMID: 29977942.
  10. Grace T, Neumann J, Samaan MA, Souza RB, Majumdar S, Link TM, Zhang AL. Using the Scoring Hip Osteoarthritis with Magnetic Resonance Imaging (SHOMRI) System to Assess Intra-articular Pathology in Femoroacetabular Impingement. J Orthop Res. 2018 Jun 27. doi: 10.1002/jor.24102. PMID: 29947434.
  11. Flores SE, Borak KR, Zhang AL. Hip Arthroscopic Surgery for Femoroacetabular Impingement: A Prospective Analysis of the Relationship Between Surgeon Experience and Patient Outcomes. Orthop J Sports Med. 2018 Feb 14;6(2):2325967118755048
  12. Samaan MA, Pedoia V, Zhang AL, Gallo MC, Link TM, Souza RB, Majumdar S. A Novel MR-based Method for Detection of Cartilage Delamination in Femoroacetabular Impingement Patients. J Orthop Res. 2017 Aug 01
  13. Tangtiphaiboontana J, Zhang AL, Pandya NK. Outcomes of intra-articular corticosteroid injections for adolescents with hip pain. J of Hip Preservation Surg. 2017 July 4:1–6. doi: 10.1093/jhps/hnx027.
  14. Samaan MA, Schwaiger BJ, Gallo MC, Sada K, Link TM, Zhang AL, Majumdar S, Souza RB. Joint Loading in the Sagittal Plane During Gait Is Associated With Hip Joint Abnormalities in Patients With Femoroacetabular Impingement. Am J Sports Med. 2017 Mar;45(4):810-818.
  15. Samaan MA, Schwaiger BJ, Gallo MC, Link TM, Zhang AL, Majumdar S, Souza RB. Abnormal Joint Moment Distributions and Functional Performance During Sit-to-Stand in Femoroacetabular Impingement Patients. PM R. 2016 Oct 8.
  16. Samaan MA, Zhang AL, Gallo MC, Schwaiger BJ, Link TM, Souza RB, Majumdar S. Quantitative magnetic resonance arthrography in patients with femoroacetabular impingement. J Magn Reson Imaging. 2016 May 18.
  17. Sing DC, Feeley, BT, Tay B, Vail TP, Zhang AL. Age-related Trends in Hip Arthroscopy: A Large Cross-sectional Analysis. Arthroscopy. 2015 Jul 17.
  18. Sharifi E., Sharifi H., Morshed S., Bozic K., Diab M.  Cost utility of peri-acetabular osteotomy compared with total hip arthroplasty.  J. Bone Joint Surg. Am. 90:1447-1456, 2008.
  19. Diab M., Hresko M.T., Millis M.B.  Intertrochanteric corrects geometry better than subcapital osteotomy in SCFE.  Clin. Orthop. 427:204-212, 2004.
  20. Diab M. and Staheli, L.T.  Practice of Paediatric Orthopaedics.  Lippincott, 2015.
  21. Theologis A.A., Li X., Souza R., Diab M.  Evaluation of hips with developmental dysplasia using T2 and T1 rho MRI.
  22. Barry JJ, Masonis JL, Mason JB. Recovery and Outcomes of Direct Anterior Total Hip Arthroplasty. Annals of Joint. 2018. In Press
  23. Barry JJ, Springer BD. Posterior Approaches to the Hip. Surgery of the Hip 2nd Edition. In Press
  24. Barry JJ, Yucekul A, Theologis AA, Hansen EN, Ames C, Deviren V. Spinal realignment for adult deformity: three-column osteotomies alter total hip acetabular component positioning. J Am Acad Orthop Surg. 2017 Feb; 25(2):125-132.
  25. Barry JJ, Sing DC, Vail TP, Hansen EN. Early Outcomes of Primary Total Hip Arthroplasty After Prior Lumbar Spinal Fusion. J Arthroplasty. 2017 Feb; 32(2):470-474.
  26. Sing DC, Barry JJ, Aguilar TU, Theologis AA, Patterson JT, Tay B, Vail TP, Hansen EN. Prior lumbar spinal arthrodesis increases risk of prosthetic-related complication in total hip arthroplasty. J Arthoplasty. 2016 Sept; 31(9 Suppl):227-232.