The Orthobullets Podcast Hand | Ulnar Variance
Aug 25, 2025
Discover the intriguing world of ulnar variance, a condition that can affect wrist function dramatically. Learn how it's defined and diagnosed, along with various treatment options. The discussion also highlights epidemiology and risk factors that contribute to this condition. Imaging techniques play a crucial role in understanding its implications, ensuring listeners get a comprehensive view of how ulnar variance impacts daily life and activities.
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Definition And Radiographic Diagnosis
- Ulnar variance measures the relative length of the ulna to the radius at the wrist on PA radiographs.
- Positive means a longer ulna and negative means a shorter ulna relative to the radius.
Epidemiology And Risk Groups
- Ulnar variance is more common and increases with age and is lower in males than females.
- Child gymnasts are at risk due to distal radial growth plate injuries causing premature physeal closure.
Causes Of Ulnar Variance
- Causes include congenital (Madelung/reverse Madelung), traumatic (distal radius fractures, growth arrest, DRUJ injuries), and iatrogenic factors.
- Procedures like radial head resection or leveling osteotomies can create positive ulnar variance.