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Ulnolunate Distance and Lunate Height: Reliability Testing.

Mark Tyson Garon¹, William B Kleinman¹

¹Indiana Hand to Shoulder Center, Indianapolis, IN.

The Journal of Hand Surgery

|February 20, 2019

Summary

New measurements for ulnar variance, including lunate height and ulnolunate distance, showed similar reliability to existing methods. These techniques may aid in evaluating wrist conditions and improving surgeon communication.

Keywords:

Lunate height ulnar variance ulnolunate distance

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Area of Science:

Orthopedic Surgery
Radiology
Hand and Wrist Anatomy

Background:

Accurate measurement of ulnar variance is crucial for diagnosing wrist pathologies.
Existing methods for ulnar variance measurement have limitations.
Novel approaches are needed to enhance reliability in wrist assessments.

Purpose of the Study:

To introduce lunate height and ulnolunate distance measurements on the zero-rotation view.
To assess the intra- and interobserver reliability of these new measurements.
To compare their reliability against traditional ulnar variance measurements.

Main Methods:

Seven hand fellows evaluated 32 wrist radiographs.
Measurements included lunate height, ulnolunate distance, and ulnar variance.
Intraclass correlation coefficients (ICC) were calculated for reliability.

Main Results:

ICC measurements for lunate height, ulnolunate distance, and ulnar variance were similar.
Intra- and interobserver reliability did not significantly differ among the three measurements.

Conclusions:

Utilizing concave surfaces of the lunate and ulna did not improve measurement reliability over the distal radius method.
Lunate height and ulnolunate distance may serve as adjuncts to ulnar variance.
Further studies are needed to confirm clinical utility for distal radius fractures and ulnocarpal abutment.