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Related Experiment Videos

Ulnar coronoid process anatomy: possible implications for elbow instability.

Robert H Ablove1, Owen J Moy, Craig Howard

  • 1Department of Orthopedics and Rehabilitation, University of Wisconsin Medical School, Madison, WI 53792-7375, USA. Ablove@orthorehab.wisc.edu

Clinical Orthopaedics and Related Research
|May 5, 2006
PubMed
Summary

Ulnar coronoid process fractures, often linked to elbow dislocations, can cause instability. This study found that fractures involving the coronoid tip often disrupt the anterior capsule, explaining this instability.

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Area of Science:

  • Orthopedic Surgery
  • Anatomy

Background:

  • Ulnar coronoid process fractures are uncommon and associated with elbow instability.
  • Coronoid tip fractures are implicated in elbow instability, but the exact mechanism is unclear.

Purpose of the Study:

  • To quantify the capsular and brachialis attachments to the ulnar coronoid process.
  • To elucidate the anatomical basis for instability in coronoid tip fractures.

Main Methods:

  • Eight fresh-frozen cadaveric elbow specimens were dissected.
  • Proximal ulnae were isolated, embedded, sectioned, and stained to analyze soft tissue attachments.
  • Measurements of distances from the coronoid tip to capsule and brachialis insertions were taken.

Main Results:

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  • The average distance from the coronoid tip to the anterior capsule attachment was 2.36 mm.
  • The average distance from the coronoid tip to the brachialis insertion was 10.13 mm.
  • Anterior capsule disruption was observed in most coronoid tip fractures.

    • Conclusions:

    • The anterior capsule attaches very close to the coronoid tip.
    • Disruption of this anterior capsule attachment during coronoid tip fractures likely contributes significantly to elbow instability.
    • Understanding these attachments is crucial for managing elbow instability following fractures.