Characterization of the 6th an 7th costal cartilaginous junction in computed tomography in the Chilean population for its use in rhinoplasty.

Abstract

Introduction: In reconstructive rhinoplasty, rib grafts are an effective option, although their primary risk is deformation or "warping." Techniques such as transverse sectioning of the sixth–seventh costal cartilaginous junction aim to reduce this risk. However, their use may be limited if calcification exceeds 25%, particularly with a central pattern. Objectives: To describe the presence of costal cartilaginous junction in the Chilean population and determine its degree and calcification pattern. Materials and Methods: A cross-sectional study analyzed chest computed tomography (CT) scans of 100 patients aged 18–99 years from Hospital del Salvador. Demographic variables, the presence and length of the right and left 6th-7th costal cartilaginous junction, as well as their degree and calcification patterns, were assessed. Results: All CT scans showed bilateral 6th-7th costal cartilaginous junction, with an average length of 15.77 mm (right) and 15.78 mm (left). Calcification was present in 73% of cases, with no significant sex differences. A central calcification pattern was observed in 13% of cases, while 64% showed a peripheral pattern. Discussion and Conclusions: Chest CT scans are a valuable tool for assessing the ossification and length of costal cartilage, aiding in rib selection for grafting. While previous studies have suggested a higher frequency of calcification in women and older individuals, this study found no significant association with sex. Furthermore, the predominance of a peripheral calcification pattern supports the feasibility of using rib cartilage as a reliable and widely available grafting option for nasal reconstruction in the Chilean population.