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Summary

This study established normal teardrop angle values for the middle phalanx base, finding a consistent mean range of 50°-51° across all digits. These findings provide a reliable reference for clinical and research applications in hand anatomy.

Keywords:
Finger anatomymiddle phalanx base fracturesproximal interphalangeal joint fractures

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Area of Science:

  • Orthopedic surgery
  • Hand anatomy
  • Radiographic measurement

Background:

  • The teardrop angle is a critical radiographic measurement at the base of the middle phalanx.
  • Establishing normative values is essential for diagnosing and managing hand and finger pathologies.
  • Variability in teardrop angle can indicate underlying skeletal abnormalities.

Purpose of the Study:

  • To determine normative values for the teardrop angle at the base of the middle phalanx.
  • To assess potential differences in teardrop angle between different digits.
  • To provide a standardized reference for clinical interpretation.

Main Methods:

  • Retrospective analysis of radiographic images.
  • Measurement of the teardrop angle using standardized digital calipers.
  • Statistical comparison of mean teardrop angles across digits.

Main Results:

  • A consistent mean teardrop angle was observed in the range of 50°-51°.
  • No statistically significant differences were found in the teardrop angle between the different digits.
  • The study established reliable normative values for this specific anatomical landmark.

Conclusions:

  • The mean teardrop angle at the base of the middle phalanx is consistently between 50°-51°.
  • Digit laterality does not significantly influence the teardrop angle.
  • These normative values are valuable for radiographic assessment in hand surgery and related fields.