A novel measure for pectus excavatum: the correction index

Area of Science:

• Thoracic surgery
• Diagnostic imaging
• Medical device evaluation

Background:

• Pectus excavatum is a chest wall deformity.
• The Haller Index (HI) is the standard metric for pectus excavatum severity.
• HI is width-dependent and does not accurately assess defect depth.

Purpose of the Study:

• To evaluate the diagnostic capability of HI.
• To compare HI with a novel index for pectus excavatum severity assessment.
• To determine the effectiveness of a new index in differentiating patients from controls.

Main Methods:

• Computed tomography (CT) scans from 252 pectus excavatum patients and 220 controls were analyzed.
• The Haller Index (HI) was calculated based on chest width and depth.
• A novel Correction Index (CI) was developed, measuring chest depth relative to chest width.

Main Results:

• Mean HI was 2.35 for controls and 4.06 for pectus patients.
• Mean CI was 0.92 for controls and 31.75 for pectus patients.
• HI showed a 47.8% overlap between groups, while CI demonstrated no overlap.

Conclusions:

• The Haller Index has significant overlap, limiting its diagnostic accuracy.
• The novel Correction Index effectively differentiates pectus excavatum patients from healthy controls.
• CI offers a more precise method for assessing pectus excavatum severity.