We employ advanced imaging research
We study biomechanics of the hip
We study cartilage health of the hip

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

Recent publications

  • Flores SE, Sheridan JR, Borak KR, Zhang AL. When 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. 
  • Hodax JD, Flores SE, Cheung EC, Zhang AL. Use 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.
  • 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.
  • 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.
  • Jansson HL, Bradley KE, Zhang AL. A Systematic Approach to Arthroscopic Femoroplasty With Conservative Management of the Hip Capsule. Arthrosc Tech. 2021 Mar 10;10(3):e797-e806. doi: 10.1016/j.eats.2020.10.071. PMID: 33738217; PMCID: PMC7953266.
  • Oji NM, Jansson H, Bradley KE, Feeley BT, Zhang AL. Comparing Patient-Reported Outcome Measurements for Femoroacetabular Impingement Syndrome. Am J Sports Med. 2021 Mar 19:363546521999403. doi: 10.1177/0363546521999403. Epub ahead of print. PMID: 33739894.
  • Zhang AL. CORR Insights: A Cam Morphology Develops in the Early Phase of the Final Growth Spurt in Adolescent Ice Hockey Players: Results of a Prospective MRI-based Study. Clin Orthop Relat Res. 2021 Jan 25. doi: 10.1097/CORR.0000000000001648. Epub ahead of print. PMID: 33497064.
  • Nguyen TQ, Friedman JM, Flores SE, Zhang AL. Fast Starters and Slow Starters After Hip Arthroscopy for Femoroacetabular Impingement: Correlation of Early Postoperative Pain and 2-Year Outcomes. Am J Sports Med. 2020 Sep 15:363546520952406. doi: 10.1177/0363546520952406. PMID: 32931329.
  • Shaw C, Warwick H, Nguyen KH, Link TM, Majumdar S, Souza RB, Vail TP, Zhang AL. Correlation of Hip Capsule Morphology with Patient Symptoms from Femoroacetabular Impingement. J Orthop Res. 2020 Jun 27;. doi: 10.1002/jor.24788.
  • Flores SE, Chambers CC, Borak KR, Zhang AL. Is There a Gender Gap in Outcomes After Hip Arthroscopy for Femoroacetabular Impingement? Assessment of Clinically Meaningful Improvements in a Prospective Cohort. Orthop J Sports Med. 2020 Jul 14;8(7):2325967119900561. doi: 10.1177/2325967119900561.
  • Chambers CC, Zhang AL. Outcomes for Surgical Treatment of Femoroacetabular Impingement in Adults. Curr Rev Musculoskelet Med. 2019 Jul 10:271-280. doi: 10.1007/s12178-019-09567-1.
  • Zhang AL. Editorial Commentary: Arthroscopic Treatment for Diminutive Hip Labral Size: Go Big or Go Home? Arthroscopy. 2021 Jan;37(1):108-110. doi: 10.1016/j.arthro.2020.09.040. PMID: 33384072.
  • You JS, Flores SE, Friedman JM, Lansdown DA, Zhang AL. The Learning Curve for Hip Arthroscopic Surgery: A Prospective Evaluation With 2-Year Outcomes in Patients With Femoroacetabular Impingement. Orthop J Sports Med. 2020 Oct 19;8(10):2325967120959140. doi: 10.1177/2325967120959140. PMID: 33178877; PMCID: PMC7592324.
  • 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.
  • Tibrewala R, Pedoia V, Lee J, Kinnunen C, Popovic T, Zhang AL, Link TM, Souza RB, Majumdar S. Automatic Hip Abductor Muscle Fat Fraction Estimation and Association with Early OA Cartilage Degeneration Biomarkers. J Orthop Res. 2020 Dec 25. doi: 10.1002/jor.24974. Epub ahead of print. PMID: 33368579.
  • 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
  • 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.
  • 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.
  • 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.
  • 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.
  • 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
  • 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
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • Diab M., Hresko M.T., Millis M.B.  Intertrochanteric corrects geometry better than subcapital osteotomy in SCFE.  Clin. Orthop. 427:204-212, 2004.
  • Diab M. and Staheli, L.T.  Practice of Paediatric Orthopaedics.  Lippincott, 2015.
  • Theologis A.A., Li X., Souza R., Diab M.  Evaluation of hips with developmental dysplasia using T2 and T1 rho MRI.
  • Barry JJ, Masonis JL, Mason JB. Recovery and Outcomes of Direct Anterior Total Hip Arthroplasty. Annals of Joint. 2018. In Press
  • Barry JJ, Springer BD. Posterior Approaches to the Hip. Surgery of the Hip 2nd Edition. In Press
  • 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.
  • 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.
  • 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.