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Computer-based three-dimensional measurement of carpal alignment: measurement techniques and normal ranges
Robert M J Sippo1, Theresa E K Höglund1, Eero Waris1
1Department of Hand Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.
The Journal of Hand Surgery, European Volume
|August 19, 2021
Summary
This study establishes normal three-dimensional carpal alignment values using advanced CT scans in healthy individuals. The computer-based analysis proved highly reliable for assessing wrist joint alignment.
Area of Science:
- Orthopedics
- Radiology
- Biomechanics
Background:
- Accurate assessment of carpal alignment is crucial for diagnosing wrist pathologies.
- Traditional methods for measuring carpal alignment can be subjective and lack precision.
- Three-dimensional imaging offers a more comprehensive view of carpal bone relationships.
Purpose of the Study:
- To establish normal three-dimensional carpal alignment values in asymptomatic volunteers.
- To evaluate the reliability of a computer-based cone-beam CT analysis for carpal alignment.
- To provide a reference database for automated carpal angle measurements.
Main Methods:
- 121 asymptomatic volunteers underwent neutral wrist position imaging using cone-beam CT.
- Custom analysis software utilized image segmentation and mathematical modeling for automated angle calculation.
- Intercarpal angles (scapholunate, radiolunate, lunocapitate) were measured.
- Intra-observer reliability was assessed by re-imaging 20 wrists.
Main Results:
- Mean scapholunate angle: 57° (SD 9°).
- Mean radiolunate angle: 2° (SD 10°).
- Mean lunocapitate angle: -14° (SD 9°).
- The automated analysis demonstrated excellent intra-observer reliability (ICC = 0.97).
Conclusions:
- Computer-based cone-beam CT analysis provides a reproducible and automated method for assessing carpal alignment.
- This study offers valuable normative data for three-dimensional carpal angles.
- The findings support the use of this technology for clinical diagnosis and research.
