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Body of tibia

The body (shaft) of the tibia is the long, central portion of the tibia, one of the major weight-bearing bones of the leg. It extends between the proximal and distal tibial ends and provides attachment for several muscles, serving as a critical structure for locomotion, stability, and load transfer from the femur to the foot. Its subcutaneous anterior surface makes it vulnerable to trauma.

Synonyms

  • Shaft of tibia

  • Diaphysis of tibia

  • Tibial body

Muscular Attachments

  • Anterior surface: Subcutaneous; no direct muscular attachments

  • Lateral surface: Tibialis anterior

  • Medial surface: Gracilis, sartorius, semitendinosus (via pes anserinus at proximal medial surface)

  • Posterior surface:

    • Soleus (soleal line)

    • Flexor digitorum longus (medial posterior surface)

    • Tibialis posterior (lateral posterior surface)

Relations

  • Anteriorly: Skin and subcutaneous tissue (making shaft palpable and prone to injury)

  • Posteriorly: Posterior compartment muscles of leg (soleus, tibialis posterior, flexor digitorum longus) and tibial neurovascular bundle

  • Medially: Subcutaneous along much of its length; medial border forms palpable “shin”

  • Laterally: Anterior compartment muscles (tibialis anterior, extensor digitorum longus, extensor hallucis longus)

Nerve Supply

  • No direct innervation; periosteum supplied by sensory branches of tibial and saphenous nerves

Arterial Supply

  • Nutrient artery from posterior tibial artery (largest diaphyseal nutrient artery in body)

  • Periosteal branches from anterior tibial artery and posterior tibial artery

Venous Drainage

  • Drains via venae comitantes of tibial arteries into popliteal vein

Function

  • Major weight-bearing bone of the leg

  • Provides structural support for standing and ambulation

  • Serves as an attachment site for leg muscles

  • Transmits forces between femur and talus

MRI Appearance

T1-weighted images:

  • Cortical bone: very low signal (black)

  • Bone marrow: intermediate to bright signal (depending on fatty content)

T2-weighted images:

  • Cortical bone: very low signal

  • Bone marrow: intermediate to bright signal

  • Pathology (edema, tumor, infection): increased signal within marrow

STIR (Short Tau Inversion Recovery):

  • Cortical bone: very low signal

  • Bone marrow: normally low, but marrow edema or inflammation appears bright

Proton Density (PD):

  • Marrow appears intermediate to bright

  • Good delineation of adjacent ligaments and meniscal attachments

Proton Density Fat-Saturated (PD FS):

  • Normal marrow shows low signal

  • Pathology such as edema, fracture, or bone bruise appears bright

T1 Fat-Sat Post-Contrast:

  • Cortical bone: no enhancement

  • Bone marrow: mild homogeneous enhancement if normal

  • Pathology (osteomyelitis, tumor): focal or diffuse enhancement

CT Appearance

Non-Contrast CT:

  • Cortical bone: high-density (bright white)

  • Medullary cavity: lower density, showing trabecular pattern

  • Excellent for detecting fractures, cortical irregularities, and periosteal reactions

Post-Contrast CT:

  • Bone itself does not enhance

  • Enhancement may be seen in periosteum, marrow, or adjacent soft tissues in infection, tumor, or inflammation

CT VRT 3D image

tibia 3d image

MRI image

Body of tibia sagittal cross sectional anatomy 3T MRI AI enhanced radiology anatomy image-img-00000-00000

CT image

Body of tibia ct coronal image

CT image

Body of tibia ct sag image

MRI image

Tibia bone anatomy image

MRI image

Tibia bone anatomy mri 3T