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Costotransverse joint of first rib

The costotransverse joint of the first rib is a synovial plane joint formed between the tubercle of the first rib and the transverse process of the first thoracic vertebra (T1). This articulation allows limited gliding motion and contributes to the mechanics of thoracic cage movement during respiration.

The joint is supported by several ligaments: the costotransverse ligament, lateral costotransverse ligament, and superior costotransverse ligament. Unlike other costotransverse joints, the first rib has more stability due to its short length and firm attachments, allowing only minimal movement.

This joint plays a key role in respiratory biomechanics, acting as a pivot point for rib elevation during inspiration. It is clinically significant in conditions such as thoracic outlet syndrome, arthritic changes, trauma, or inflammatory joint disease.

Synonyms

  • Articulatio costotransversaria primae costae

  • Costotransverse articulation of T1

Function

  • Provides a synovial articulation between the first rib and T1 transverse process

  • Permits slight gliding motion, aiding thoracic expansion during respiration

  • Stabilizes the first rib with ligamentous support

  • Serves as a landmark in radiology, thoracic surgery, and regional anesthesia

MRI Appearance

T1-weighted images:

  • Bone cortex appears as low signal intensity; marrow shows intermediate signal

  • Joint space is low signal, surrounded by ligaments of low intensity

T2-weighted images:

  • Synovial fluid in the joint space appears bright hyperintense

  • Cartilage and surrounding ligaments remain low signal

  • Detects joint effusion, cysts, or cartilage changes

STIR:

  • Suppresses fat, making marrow edema, inflammatory changes, or fractures conspicuous as hyperintense areas

  • Useful in early detection of arthritis or trauma-related changes

T1 Post-Gadolinium (Gd-enhanced MRI):

  • Joint capsule may enhance if inflamed

  • Detects synovitis, inflammatory arthropathy, or neoplastic involvement

  • Enhances visualization of surrounding ligamentous and soft tissue pathology

MRI Non-Contrast 3D Imaging:

  • Provides multiplanar evaluation of rib-vertebra articulation and joint alignment

  • Useful in surgical planning and congenital anomaly assessment

CT Appearance

Non-contrast CT:

  • Excellent for evaluating bony detail: cortical margins, fractures, degenerative changes

  • Visualizes joint space narrowing, osteophytes, or subchondral sclerosis

CT Post-Contrast:

  • Enhances visualization of adjacent soft tissue and inflammatory changes

  • Useful in detecting infection, joint effusion, or neoplastic extension

  • 3D reconstructions show rib-transverse process articulation in detail

MRI image

Costotransverse joint of first rib MRI coronal image -img-00000-00000

CT image

Costotransverse joint of first rib CT axial image -img-00000-00000