The LD-V: An innovative formula for latissimus dorsi flap volume assessment

background: latissimus dorsi (LD) flap is at present among the best techniques for autologous breast reconstruction. a reliable pre-operatory estimation of flap volume would enhance surgical planning, thus improving the aesthetic outcomes of the reconstruction and reducing the need of secondary revision procedures. the study was aimed at providing a simple and reproducible formula to predict LD flap volume pre-operatively. methods: 61 patients (66 flaps) who underwent breast reconstruction with LD flap at policlinico tor vergata were prospectively enroled in the study. anthropometric data and flap measurements were collected pre-operatively. LD flap volume was determined intraoperatively utilising a water displacement technique. a multivariate regression analysis was performed to analyse the collected data and to obtain the mathematical model that most accurately predicts flap volume. results: the mean actual LD flap volume calculated through water displacement was 213.14 cc (SD 64.56). performing a multivariate regression analysis BMI and skin paddle width emerged as the most accurate predictors of latissimus dorsi flap volume. the mean predicted LD flap volume (LD-V) using the LD-V formula was 213.19 cc (SD 54.59), with a strong pearson correlation (r = 0.845; R2 =0.715) with the volume calculated through the water displacement technique. conclusions: the LD-V formula is an easy and reliable tool for LD flap volume assessment, available as 3.0 WebApp at www.braflap.com, that can be used as a valuable adjunct to surgeon's subjective evaluation to optimise breast reconstruction with the LD flap. level of evidence: II.