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Negative Ulnar Variance and Kienböck Disease.
Wouter F van Leeuwen1, Kamilcan Oflazoglu1, Mariano E Menendez1
1Department of Orthopaedic Surgery, Hand and Upper Extremity Service, Massachusetts General Hospital, Harvard Medical School, Boston, MA.
The Journal of Hand Surgery
|December 22, 2015
Summary
Ulnar variance (UV) scaled to capitate height differs significantly in Kienböck disease patients compared to controls. However, negative UV is common in both groups and not linked to age, sex, or race.
Area of Science:
- Orthopedics
- Radiology
- Hand Surgery
Background:
- Kienböck disease is a condition affecting the lunate bone in the wrist.
- Ulnar variance (UV), the relative length of the ulna compared to the radius, has been implicated in Kienböck disease.
- Previous studies suggest a link between negative UV (ulna minus) and Kienböck disease.
Purpose of the Study:
- To investigate differences in scaled ulnar variance (UV:CH ratio) between Kienböck disease patients and matched controls.
- To determine if scaled UV varies with age, sex, or race in Kienböck disease and control wrists.
Main Methods:
- Ulnar variance (UV) was measured from posteroanterior wrist radiographs.
- UV was scaled to the length of the capitate bone, creating a UV:CH ratio.
- 166 wrists with Kienböck disease were compared to 166 matched controls.
Main Results:
- A significant difference in the mean UV:CH ratio was found between Kienböck disease patients and controls.
- Negative UV was prevalent in both Kienböck disease patients and controls.
- No significant differences in mean UV:CH ratio were observed based on age, sex, or race within either group.
Conclusions:
- The study found a significant difference in scaled ulnar variance between Kienböck disease patients and controls.
- The high prevalence of negative UV in both groups and its rarity in the general population suggests its role in Kienböck disease pathogenesis remains unclear.
- The precise role of negative UV in the development of Kienböck disease requires further investigation.
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