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Bones of the Upper Limb: Ulna01:15

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The ulna and radius are parallel bones of the antebrachium or the forearm. The ulna lies medially and consists of a bony tip called the olecranon process at its proximal end. This hook-like projection articulates with the olecranon fossa of the humerus and forms the "hinged" ulnohumeral part of the elbow joint. This joint facilitates forearm extension and flexion while preventing its hyperextension. Similarly, the coronoid process, another bony projection on the proximal/anterior side...
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The Signal-Compromised Lunate.

Jan-Peter Grunz1, Karsten Sebastian Luetkens1, Rainer Schmitt1,2

  • 1Department of Diagnostic and Interventional Radiology, University Hospital Würzburg, Würzburg, Germany.

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|December 3, 2025
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Summary
This summary is machine-generated.

Lunate bone signal changes indicate carpal health issues like Kienböck

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Area of Science:

  • Orthopedics
  • Radiology
  • Musculoskeletal Imaging

Background:

  • Lunate bone signal alterations can stem from various conditions, including Kienböck's disease and ulnocarpal impaction syndrome.
  • Assessing lunate bone health is crucial for diagnosing carpal pathologies.
  • Magnetic resonance imaging (MRI) is frequently used, but a comprehensive diagnosis requires integrating patient history, clinical symptoms, and imaging findings.

Purpose of the Study:

  • To review the diagnostic approaches for lunate bone pathologies.
  • To emphasize the role of advanced imaging techniques in assessing lunate bone vitality.
  • To highlight the importance of gadolinium enhancement in differentiating viable from necrotic bone tissue.

Main Methods:

  • Review of current literature on lunate bone pathologies and their imaging characteristics.
  • Discussion of diagnostic modalities including standard radiography, high-resolution computed tomography (CT), and MRI.
  • Emphasis on the use of intravenous contrast agents in MRI for assessing bone viability.

Main Results:

  • Standard radiography is the initial diagnostic step, while high-resolution CT offers more precise morphological analysis.
  • Gadolinium enhancement on MRI is critical for determining lunate bone vitality, distinguishing it from edema.
  • Accurate diagnosis relies on a multimodal approach combining clinical evaluation and advanced imaging.

Conclusions:

  • Integrated assessment of clinical data and imaging is essential for diagnosing lunate bone conditions.
  • MRI with gadolinium contrast is vital for evaluating suspected lunate osteonecrosis.
  • Distinguishing between viable and necrotic tissue is key for treatment planning in lunate pathologies.