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Objective Assessment of the Precision, Accuracy, and Reliability of a Measurement Method for Keloid Scar Volume
Brian Berman1, Vernon Leroy Young, Joanne McAndrews
1*Department of Dermatology, University of Miami Miller School of Medicine, Miami, Florida; †Mercy Health Research, Washington, Missouri; ‡Saint Louis, Missouri.
Background:
There is no accepted and validated method for quantitatively measuring keloid scar volume.
Objective:
The goal of this study was to develop a measurement method for ear keloid scar volume that is economical, practical, safe, reproducible, accurate, and precise.
Methods:
Ten synthetic keloids of various shapes and sizes were temporarily attached to the ears of 5 subjects. Three study raters molded each of the attached synthetic keloids and surrounding tissue of each of the subjects twice using a polyvinyl siloxane dental impression material to form a negative impression of the keloid. Once the impression material cured, the mold was removed from the subjects' ears and randomized for measurement by study raters. Molds were filled with distilled water and weighed to obtain the weight of water required to fill the impression of the keloid.
Results:
The test method defined by this study accurately and precisely measures the volume of a focal protrusion extending beyond the normal surface plane of a test subject's ear. The calculated intrarater correlation coefficient values for both the intrarater and interrater reliabilities were >0.75.
Conclusion:
The techniques and methods used in this study resulted in an accurate and reliable method for measuring ear keloid scar volumes.
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