Linea alba 3D morphometric variability by CT scan exploration

Area of Science:

• Anatomy
• Medical Imaging
• Biomedical Engineering

Background:

• The Linea alba's width, often measured by inter-rectus distance, is a significant risk factor for incisional hernias and their recurrence.
• Previous anatomical descriptions of the Linea alba were limited, lacking detail on width, location variability, and curvature.

Purpose of the Study:

• To conduct a comprehensive 3D anatomical analysis of the Linea alba.
• To emphasize and document the anatomical variations of the Linea alba across diverse demographics.

Main Methods:

• Utilized open-source software for 2D sagittal plane and 3D reconstructions from 117 patient CT scans.
• Measured Linea alba length, curvature (sagitta), and continuous width.
• Assessed variations in relation to demographic factors and body mass index (BMI).

Main Results:

• The Linea alba exhibits a rhombus shape, with maximum width (4.4 ± 1.9 cm) at the umbilicus, wider above than below.
• Linea alba length (37.5 ± 3.6 cm) increased with BMI and was shorter in women.
• Width increased with age and BMI; curvature (sagitta) was greater in obese individuals and with age.

Conclusions:

• This study offers an exhaustive 3D anatomical description of the Linea alba, including novel insights into its curvature.
• The 3D reconstruction method provides patient-specific anatomical details of the Linea alba.
• Further research is warranted to correlate these 3D anatomical findings with pathologies like hernias and diastasis recti.