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Costochondral joints

The costochondral joints are the cartilaginous junctions between the anterior ends of the ribs and their corresponding costal cartilages. They are classified as primary cartilaginous joints (synchondroses), meaning they are united by hyaline cartilage and lack a synovial cavity. These joints allow the ribs to transition into cartilage, providing both stability and flexibility to the thoracic cage. The costochondral joints are particularly important in respiratory mechanics, chest wall expansion, and as sites of clinical relevance in trauma and inflammatory conditions (e.g., costochondritis).

Synonyms

  • Rib–costal cartilage junctions

  • Costochondral synchondroses

  • Thoracic wall cartilage joints

Function

  • Provide a stable yet slightly flexible junction between ribs and costal cartilages

  • Facilitate thoracic cage expansion and contraction during respiration

  • Maintain structural integrity of the rib cage

  • Serve as growth sites during skeletal development

  • Clinical landmark in thoracic wall trauma and inflammatory chest pain syndromes

MRI Appearance

T1-weighted images:

  • Costochondral cartilage shows low to intermediate signal intensity

  • Surrounding marrow of rib ends is hyperintense due to fatty bone marrow

  • Fractures or inflammatory changes appear as low-signal irregularities at the junction

T2-weighted images:

  • Cartilage appears signal intensity

  • Joint pathology (inflammation, edema, fracture) demonstrates hyperintense signal changes

  • Effusions or cystic degeneration appear bright

STIR (Short Tau Inversion Recovery):

  • Fat suppression highlights edema and inflammatory changes

  • Normal cartilage remains intermediate signal

  • Pathology (costochondritis, trauma, stress injury) appears bright hyperintense

T1 Post-Contrast (Gadolinium-enhanced):

  • Normal costochondral cartilage shows minimal enhancement

  • Inflamed or pathological joints (costochondritis, infection, tumor) demonstrate focal or diffuse enhancement

CT Appearance

Non-contrast CT:

  • Costal cartilage is seen as low attenuation (hypodense) relative to bone

  • Calcification of cartilage appears hyperdense, often age-related

  • Rib ends are clearly defined as cortical hyperdense bone joining the cartilage

Contrast-enhanced CT (CECT):

  • Enhances visualization of surrounding soft tissues

  • Detects inflammatory thickening, fractures, calcifications, or masses

  • Useful for evaluating trauma, infection, and costochondral calcification

MRI image

Costochondral joints anatomy MRI coronal image -img-00000-00000

CT images

Costochondral joints anatomy CT axial image -img-00000-00000

CT images

Costochondral joints anatomy CT coronal image -img-00000-00000