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Ulnar variance and scaphoid fracture.

J Ramos-Escalona¹, L García-Bordes, P Martínez-Galarza

¹Department of Orthopaedic Surgery and Traumatology, Hospital General de Granollers, Granollers, Barcelona, Spain.

The Journal of Hand Surgery, European Volume

|December 17, 2009

Summary

Most scaphoid fractures exhibit negative ulnar variance, also known as ulna minus variance. This retrospective study found a higher proportion of ulna minus wrists in scaphoid fracture cases compared to prior research.

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Area of Science:

Orthopedic Surgery
Radiology
Hand Surgery

Background:

Ulnar variance, the relative length of the ulna compared to the radius, is a significant factor in wrist biomechanics.
Previous studies have explored the relationship between ulnar variance and various wrist pathologies.

Purpose of the Study:

To retrospectively analyze ulnar variance in a cohort of patients with scaphoid fractures.
To compare the distribution of ulnar variance in scaphoid fractures with existing literature.

Main Methods:

Retrospective review of 66 scaphoid fracture radiographs taken between 1997 and 2006.
Classification of wrists into 'ulna neutral', 'ulna plus', and 'ulna minus' based on ulnar variance measurements.
Statistical analysis to compare distributions and proportions with previous publications.

Main Results:

The majority of patients (59.1%) presented with 'ulna minus' wrists.
The mean ulnar variance was -1.3 mm (SD 1.8 mm).
A statistically significant difference in ulnar variance distribution (P < 0.00001) and a higher proportion of 'ulna minus' wrists (OR = 5.0) were observed compared to previous studies.

Conclusions:

Scaphoid fractures are significantly associated with 'ulna minus' variance.
Findings suggest a potential role of ulnar variance in the etiology or presentation of scaphoid fractures.
Further research is warranted to elucidate the precise relationship between ulnar variance and scaphoid bone injuries.