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Triquetral Alignment: Measurement Techniques, Reliability, and Normal Values.

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Summary

Computer-aided analysis offers a reliable method for assessing triquetral alignment, improving diagnostic accuracy for carpal instability. This study establishes normal values for triquetral alignment using this advanced technique.

Keywords:
carpal alignmentcomputer-aided analysislunotriquetralmeasurement reliabilitynormal values

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Area of Science:

  • Orthopedic surgery
  • Radiology
  • Biomechanics

Background:

  • Assessing triquetral alignment is crucial for diagnosing carpal instability.
  • Existing methods for measuring triquetral alignment lack reliability.
  • Standardized and accurate measurement techniques are needed.

Purpose of the Study:

  • To evaluate factors influencing the reliability of triquetral angle measurements by experienced observers.
  • To establish normal values for triquetral alignment using computer-aided analysis software.
  • To compare the reliability of manual versus computer-aided measurements.

Main Methods:

  • 121 cone-beam computed tomography scans of asymptomatic wrists were analyzed using mathematical modeling software.
  • Radiotriquetral and lunotriquetral angles were measured.
  • Manual measurements were performed by hand surgeons on lateral radiographs, with and without instructions and image optimization.
  • Intra- and interobserver reliability was assessed using intraclass correlation coefficients.

Main Results:

  • Computer-aided analysis demonstrated excellent repeatability.
  • Manual measurements using the traditional axial axis showed poor to moderate reliability.
  • A novel perpendicular axis in optimized images yielded excellent reliability for manual measurements.
  • The software identified abnormal triquetral angles in patients with carpal instability.

Conclusions:

  • Manual identification of the triquetral axis on radiographs is unreliable.
  • Computer-aided analysis provides a more reliable method for assessing triquetral alignment.
  • Established normal values aid in diagnosing triquetral pathology and carpal instability.