Kager fat pad

Changed by Uzair Sarmast, 14 Nov 2014

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Kager's fat pad
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Kager's fat pad refers (also known as the pre-Achilles fat pad) refers to the fat within the Kager triangle, which normally appears darklucent (fat density) on radiographs and has relatively defined margins. Pathologies affecting the aforementioned (and other nearby) bordering structures structures results in oedema in the fat pad, which radiographically appears as loss of the normal margins and increased density in the triangle.  

Pathologies Distorting its Normal Appearance:

  • Oedema
  • Hemorrhage
  • Infection (soft tissue, osteomyelitis)
  • Inflammation (Achilles bursitis, peritendinitis)
  • Thickened Tendons (xanthomatosis, rheumatoid arthritis, gout, ankylosis spondylitis, reactive arthritis)
  • Adjacent neoplasm (soft tissue, osseous)

In the setting of trauma, oedema in Kager's fat pad should lead to a careful search for bony or soft tissue injury (ie. Achilles Tendon injury), perhaps requiring additional views and/or cross-sectional imaging depending on the clinical suspicion.

  • -<p><strong>Kager fat pad</strong> refers to the fat within the <a title="Kager triangle" href="/articles/kager-triangle">Kager triangle</a>, which normally appears dark (fat density) on radiographs. Pathologies affecting the aforementioned (and other nearby) bordering structures results in oedema in the fat pad, which radiographically appears as loss of the normal margins and increased density in the triangle.  </p><p>Oedema in Kager's fat pad should lead to a careful search for bony or soft tissue injury, perhaps requiring additional views and/or cross-sectional imaging depending on the clinical suspicion.</p>
  • +<p><strong>Kager's fat pad</strong> (also known as the pre-Achilles fat pad) refers to the fat within the <a href="/articles/kager-triangle">Kager triangle</a>, which normally appears lucent (fat density) on radiographs and has relatively defined margins. Pathologies affecting nearby structures results in loss of the normal margins and increased density in the triangle.  </p><p>Pathologies Distorting its Normal Appearance:</p><ul>
  • +<li>Oedema</li>
  • +<li>Hemorrhage</li>
  • +<li>Infection (soft tissue, osteomyelitis)</li>
  • +<li>Inflammation (Achilles bursitis, peritendinitis)</li>
  • +<li>Thickened Tendons (xanthomatosis, rheumatoid arthritis, gout, ankylosis spondylitis, reactive arthritis)</li>
  • +<li>Adjacent neoplasm (soft tissue, osseous)</li>
  • +</ul><p>In the setting of trauma, oedema in Kager's fat pad should lead to a careful search for bony or soft tissue injury (ie. Achilles Tendon injury), perhaps requiring additional views and/or cross-sectional imaging depending on the clinical suspicion.</p>

References changed:

  • 3. Goodman L & Shanser J. The Pre-Achilles Fat Pad: An Aid to Early Diagnosis of Local or Systemic Disease. Skeletal Radiol. 1977;2(2):81-6. <a href="https://doi.org/10.1007/bf00360986">doi:10.1007/bf00360986</a>

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