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Updated: May 6, 2026
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Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact
Published on: February 10, 2015
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Scaphoid translation measurements in normal wrists.
Ronit Wollstein1, Frederick W Werner, Roee Rubenstein
1Department of Surgery, Division of Plastic and Reconstructive Surgery and Department of Orthopedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.
Summary
This study introduces a precise scaphoid translation measurement using wrist radiographs. This new method aids in evaluating radiocarpal ligaments and diagnosing wrist instability.
Area of Science:
- Orthopedic Surgery
- Radiology
- Biomechanics
Background:
- Assessing radiocarpal ligament integrity is crucial for diagnosing wrist injuries.
- Current methods may not accurately capture scaphoid translation, impacting diagnosis of instability.
- Understanding normal scaphoid positioning is key to identifying pathological states.
Purpose of the Study:
- To establish a reliable measurement for normal scaphoid position in the radioulnar plane on posteroanterior radiographs.
- To develop a method for indirect evaluation of radiocarpal ligaments.
- To enable comparison between normal and pathological wrist conditions.
Main Methods:
- Measurements were performed on 74 normal wrist radiographs and 25 cadaver wrists.
- Evaluated the distance between the radial styloid and scaphoid, and scaphoid width.
- Calculated the ratio of distance to width at the mid-styloid level.
Main Results:
- The ratio of distance/width at the mid-styloid level (0.35 ± 0.1 SD) demonstrated the lowest random error.
- This ratio represents the most precise measurement of true scaphoid translation.
- The measurement is independent of scapholunate ligament integrity.
Conclusions:
- A novel, precise measurement for scaphoid translation has been established.
- This measurement aids in assessing the radiocarpal component of ulnar translational instability.
- Accurate identification of scaphoid displacement can help prevent arthritis development.
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