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Costotransverse joint

The costotransverse joint is a synovial articulation between the tubercle of a rib and the transverse process of the corresponding thoracic vertebra. Each thoracic vertebra (except T11–T12) forms a pair of costotransverse joints, providing posterolateral stability and controlled mobility to the thoracic cage. The joint is reinforced by superior, lateral, and posterior costotransverse ligaments, which help limit excessive movement and transmit forces from the ribs to the vertebrae. The costotransverse joint contributes to thoracic spine biomechanics, respiratory mechanics, and load distribution, enabling coordinated rib motion during breathing.

Synonyms

  • Rib-transverse process joint

  • Articulatio costotransversaria

  • Thoracic costotransverse articulation

Function

  • Connects ribs to the thoracic vertebrae for stability and mobility of the thoracic cage

  • Facilitates respiratory movements, allowing elevation and depression of the ribs

  • Distributes mechanical forces from the ribs to the vertebral column

  • Supports spinal biomechanics and thoracic alignment

MRI Appearance
T1-weighted images:

  • Appears as a small, linear low-signal synovial space between the rib tubercle and transverse process

  • Surrounded by intermediate signal bone marrow in the rib and transverse process

  • Adjacent soft tissue and ligaments appear intermediate to low signal, providing contrast

  • Pathology such as arthritis or inflammatory changes may show synovial effusion or marrow edema as signal alterations

T2-weighted images:

  • Synovial fluid within the joint appears hyperintense, highlighting the joint space

  • Cortical bone remains hypointense, clearly delineating articular margins

  • Useful for detecting joint effusion, inflammation, or early degenerative changes

STIR (Short Tau Inversion Recovery):

  • Suppresses fat signal in surrounding marrow, making edema or inflammation highly conspicuous

  • Normal joint space remains low signal; arthritic changes or injury appear hyperintense

  • Excellent for identifying stress reactions or traumatic injury to the joint

CT Appearance

  • Appears as a well-corticated articulation between the rib tubercle and transverse process

  • Joint space may be narrow and is subtle without contrast, but cortical margins are clearly visible

  • Surrounding ribs and vertebrae are hyperdense, while the air in lungs provides natural contrast

  • Particularly useful for evaluating fractures, osteophytes, joint space narrowing, and degenerative changes

MRI images

Costotransverse joint mri axial image -img-00000-00000

MRI images

Costotransverse joint mri axial image

CT images

Costotransverse joint anatomy CT axial image -img-00000-00000

CT images

Costotransverse joint anatomy CTcoronal image -img-00000-00000

MRI image

Costotransverse joint mri