Delayed-Onset Ulnar Neuropathy at the Wrist Associated With Distal Radioulnar Joint Arthritis After Radius Malunion: Report of Two Cases

Anatomy 470Causes of ulnar corner pain 472Tendon 474Hook of hamate non-union 475Luno-triquetral instability 476Ulnar translation of carpus 477Distal radioulnar joint 478Ulno–carpal joint 480Pisotriquetral joint 482Other causes of ulnar corner pain 484Surgical procedures 486Ulnar head—270° cartilage, articulates with sigmoid notch of distal radius. Variable concavity of sigmoid notch = variable contribution to stability and variable exposure to ulnar corner symptoms after distal radius malunion....

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Treatment Options for Distal Radioulnar Joint Arthritis

Hand Clinics ◽

10.1016/j.hcl.2021.06.010 ◽

2021 ◽

Vol 37 (4) ◽

pp. 575-586

Author(s):

Gina Farias-Eisner ◽

Stephen D. Zoller ◽

Nicholas Iannuzzi

Keyword(s):

Treatment Options ◽

Distal Radioulnar Joint ◽

Radioulnar Joint ◽

Joint Arthritis

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Effects of distal radius malunion on distal radioulnar joint mechanics—an in vivo study

Journal of Orthopaedic Research® ◽

10.1002/jor.20322 ◽

2007 ◽

Vol 25 (4) ◽

pp. 547-555 ◽

Cited By ~ 49

Author(s):

Joseph J. Crisco ◽

Douglas C. Moore ◽

G. Elisabeta Marai ◽

David H. Laidlaw ◽

Edward Akelman ◽

...

Keyword(s):

Distal Radius ◽

Distal Radioulnar Joint ◽

In Vivo Study ◽

Joint Mechanics ◽

Radioulnar Joint ◽

Distal Radius Malunion ◽

Radius Malunion

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Subluxation-related ulnar neuropathy (SUN) syndrome related to distal radioulnar joint instability

Journal of Hand Surgery (European Volume) ◽

10.1177/1753193411432707 ◽

2011 ◽

Vol 37 (7) ◽

pp. 652-664 ◽

Cited By ~ 6

Author(s):

P. S. C. Malone ◽

C. E. Hutchinson ◽

N. S. Kalson ◽

C. J. Twining ◽

G. Terenghi ◽

...

Keyword(s):

Imaging Study ◽

Distal Radioulnar Joint ◽

Ulnar Neuropathy ◽

Diagnostic Study ◽

Historical Cohort ◽

Radioulnar Joint ◽

Qualitative And Quantitative ◽

Druj Instability ◽

Level Ii ◽

Quantitative Analyses

Ulnar neuropathy coexistent with distal radioulnar joint (DRUJ) instability has previously been observed in our practice. The aim of this study was to define this phenomenon and investigate the hypothesis that the cause of this intermittent, positional ulnar neuropathy is related to kinking of the ulnar nerve about the DRUJ. Ulna neuropathy was present in 10/51 (19.6%) of a historical cohort of patients who presented with DRUJ instability. Nine subsequent patients with DRUJ instability and coexistent ulnar neuropathy underwent 3-T magnetic resonance imaging to better understand the mechanism of the observed syndrome. Both 3D qualitative and quantitative analyses were used to assess the presence of nerve ‘kinking’, displacing the nerve from its normal course and causing nerve compression/distraction in the distal forearm and Guyon’s canal. Results of the quantitative analysis were statistically significant ( p < 0.05). The clinical features of the condition have been delineated and termed subluxation-related ulnar neuropathy or SUN syndrome. The imaging study was a level II diagnostic study.

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