Objective: Autologous costal cartilage is used extensively in reconstructive surgery because of its stability, durability, and biocompatibility. The current preoperative evaluation of costal cartilage often only consists of a physical examination. Several studies have highlighted the benefits of preoperative imaging as a tool to ensure optimal graft harvest. This systematic review aims to synthesize the current evidence and establish the efficacy of the various imaging modalities for the assessment of costal cartilage.
Review methods: The data sources were explored using a search strategy based on the terms ("costal cartilage" OR "ribs" AND "imaging*") combined with Boolean operators. The primary outcome measures were the ability to measure the dimensions of costal cartilages and to detect the presence of calcifications.
Results: A total of 28 publications were included in the final review, with 12 case series, 7 case control studies, and 9 cohort studies. Twenty-two studies used computed tomography (CT); 4 studies used x-ray and 2 studies used ultrasonography, whereas no studies used magnetic resonance imaging. Meta-analysis of the data from these studies was not deemed possible.
Conclusions: Our findings suggest that CT is the modality with the strongest evidence base that provides the greatest degree of information. The major benefits of CT are its ability to provide 3-dimensional image reconstruction for surgical planning, ability to detect synchondroses, and assess cartilage quality. Where radiation exposure is less preferable, x-ray and ultrasound (US) may play an important role. X-ray appears to be particularly useful when the main concern is the presence of calcification. The limited studies available indicate that US can provide useful and accurate information on cartilage quality and morphology. Further studies are warranted in exploring the use of US in preoperative planning, particularly in the pediatric population.
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