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Os capitatotrapezoid: a case report

R Choudhry1, A Tuli, M Chimmalgi

  • 1Department of Anatomy, Lady Hardinge Medical College, New Delhi, India.

Surgical and Radiologic Anatomy : SRA
|January 23, 1999
PubMed
Summary
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A rare fusion of the capitate and trapezoid bones, termed os capitatotrapezoid, was identified in a male skeleton's hand. This anatomical variation showed nearly complete fusion with specific radiographic findings.

Area of Science:

  • Anatomy
  • Osteology
  • Human Variation

Background:

  • Carpal bone anatomy is crucial for understanding hand function.
  • Variations in carpal bone morphology can impact biomechanics.
  • The os capitatotrapezoid (OCT) is an uncommon carpal bone fusion.

Purpose of the Study:

  • To document and describe a case of fused capitate and trapezoid bones (os capitatotrapezoid).
  • To analyze the morphological and radiographic characteristics of this rare carpal anomaly.

Main Methods:

  • Gross examination of an articulated male skeleton's right hand.
  • Radiographic analysis (e.g., X-ray) to assess internal bone structure and joint integrity.
  • Comparative anatomical review of carpal bone fusions.

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Main Results:

  • Discovery of a complete fusion between the capitate and trapezoid bones, forming an os capitatotrapezoid (OCT).
  • The fusion exhibited shallow grooves indicating the fused margins.
  • Radiology confirmed normal trabecular bone patterns and the absence of a joint cavity within the fused bones.
  • Absence of the styloid process of the third metacarpal was also noted.

Conclusions:

  • This case represents a rare instance of os capitatotrapezoid (OCT) in human anatomy.
  • The radiographic findings suggest a solid bony union without functional joint space.
  • The associated absence of the third metacarpal styloid process may indicate a broader developmental field defect.