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Prior-Procedure Error Type and Graft Survival in Revision Hair Transplantation: A Retrospective Cohort Study at Vera Clinic, Istanbul, Turkey


Authors : Samuel Filima; Victor Benoit

Volume/Issue : Volume 11 - 2026, Issue 8 - August


Google Scholar : https://tinyurl.com/46jrtsfs

DOI : https://doi.org/10.38124/ijisrt/26aug1592

Note : A published paper may take 4-5 working days from the publication date to appear in PlumX Metrics, Semantic Scholar, and ResearchGate.


Abstract : Background: Revision hair transplantation is increasingly requested to correct deficiencies from prior procedures performed at Vera Clinic or elsewhere, yet data characterizing the type and clinical consequences of prior-procedure errors remain limited within the existing hair-restoration literature.  Methods: This retrospective cohort study reviewed clinical records of patients who underwent revision hair transplantation at Vera Clinic between January 2022 and December 2024. Prior-procedure errors were classified into five categories (poor angle or direction, low density, donor depletion or over-harvesting, unnatural hairline design, or combined factors) using a structured classification checklist applied by a single rater, together with a covariate for the origin of the prior procedure (Vera Clinic or an external clinic). The primary outcome was graft survival at 12 months post-revision, assessed trichoscopically. Secondary outcomes were 24-month graft survival, patient-reported satisfaction measured with the HAIRQ [1], and additional graft requirement.

References :

  1. Klassen AF, Mansouri J, Kaur M, Rae C, Poulsen L, Dayan S, et al. Development and validation of a patient-reported outcome measure for hair loss treatment: The HAIR-Q. J Cosmet Dermatol. 2024;23(11):3705-3715.
  2. Garg AK, Garg S. Complications of hair transplant procedures—causes and management. Indian J Plast Surg. 2021;54(4):477-482.
  3. International Society of Hair Restoration Surgery. 2022 ISHRS Practice Census Results [Internet]. Chicago: ISHRS; 2022 [cited 2026 Jul 21]. Available from: https://ishrs.org/ishrs-2022-practice-census-results/
  4. Vogel JE, Jimenez F, Cole J, Keene SA, Harris JA, Barrera A, et al. Hair restoration surgery: the state of the art. Aesthet Surg J. 2013;33(1):128-151.
  5. Vera Clinic Academy. Graft Survival Rates Following Follicular Unit Extraction at 12 and 24 Months — A Retrospective Cohort Study at Vera Clinic, Istanbul, Turkey [Internet]. 2026 [cited 2026 Jul 21]. Available from: https://www.veraclinic.net/wp-content/uploads/2026/06/Graft-Survival-Rates-Following-Follicular-Unit-Extraction-at-12-and-24-Months-A-Retrospective-Cohort-Study-at-Vera-Clinic-Istanbul-Turkey.pdf
  6. Vera Clinic Academy. Quantitative Mapping of Follicular Regrowth Kinetics and Donor Area Harvesting Thresholds: A Prospective Longitudinal and Retrospective Cohort Study [Internet]. 2026 [cited 2026 Jul 21]. Available from: https://www.veraclinic.net/wp-content/uploads/2026/06/Quantitative-Mapping-of-Follicular-Regrowth-Kinetics-and-Donor-Area-Harvesting-Thresholds-A-Prospective-Longitudinal-and-Retrospective-Cohort-Study.pdf
  7. Tan IJ, Jafferany M. Psychological dimensions of hair transplantation: a narrative review of current evidence. J Cosmet Dermatol. 2025;24(10):e70475.
  8. Popescu FM, Filip L, Popescu M, Florescu IP. Stem cell therapy prior to follicular unit hair transplantation on scarred tissue: a novel approach to a successful procedure. J Med Life. 2024;17(6):582-587.

Background: Revision hair transplantation is increasingly requested to correct deficiencies from prior procedures performed at Vera Clinic or elsewhere, yet data characterizing the type and clinical consequences of prior-procedure errors remain limited within the existing hair-restoration literature.  Methods: This retrospective cohort study reviewed clinical records of patients who underwent revision hair transplantation at Vera Clinic between January 2022 and December 2024. Prior-procedure errors were classified into five categories (poor angle or direction, low density, donor depletion or over-harvesting, unnatural hairline design, or combined factors) using a structured classification checklist applied by a single rater, together with a covariate for the origin of the prior procedure (Vera Clinic or an external clinic). The primary outcome was graft survival at 12 months post-revision, assessed trichoscopically. Secondary outcomes were 24-month graft survival, patient-reported satisfaction measured with the HAIRQ [1], and additional graft requirement.

Paper Submission Last Date
30 - September - 2026

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