A simplified three-dimensional volume measurement technique in keloid scars: Validity and reliability

T. van der Aa, S. H. W. L. Verhiel*, M. Erends, A. A. Piatkowski de Grzymala, E. Van den Kerckhove, C. Colla, R. R. W. J. van der Hulst

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review


Introduction: Effective treatment of keloid scars is important because patients are often confronted with major cosmetic, psychological, and social consequences. Threedimensional (3D) imaging has been reported for the evaluation of keloid treatment. These techniques were complex to use in clinical practice. In this study, the validity and reliability of a simplified 3D volume measurement technique are defined. Methods: Thirty-three scars were simulated using deformable modeling compound. The volume of the compound is calculated using the weight and density of the modeling compound, and it is compared with the 3D volume measurement. Results: The mean simulated keloid volume was 2.884 cc. The correlation was very high (r = 0.999), but there was a significant mean difference of 0.252 cc (p <0.001). This was corrected using a formula, actual volume = 1.072 x measured volume. This formula was validated using a new data set of 33 simulated scars. There was a nonsignificant mean difference of 0.010 cc (p = 0.731). Conclusion: This 3D measurement technique combined with the correcting formula is valid and reliable to be used in practice for the evaluation of keloid scar treatment.
Original languageEnglish
Pages (from-to)1574-1580
JournalJournal of Plastic Reconstructive and Aesthetic Surgery
Issue number11
Publication statusPublished - Nov 2015


  • Keloids
  • Hypertrophic scars
  • Scar assessment
  • Three-dimensional imaging
  • Objective follow-up


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