title: Ultrasonographic evaluation of displaced neurovascular bundle in Dupuytren disease.
abstract: OBJECTIVE
  Neurovascular injury is a serious complication after surgery for Dupuytren disease. The purpose of this study was to evaluate the relationship between the cord and the neurovascular bundle ultrasonographically.
  
  
  METHODS
  We included 22 healthy volunteers and 14 Dupuytren disease patients (25 fingers) in this study. We evaluated the cord and the digital artery with high-resolution ultrasound. We first investigated the effect of the angle of metacarpophalangeal joint on the position of the radial and ulnar digital arteries in volunteers without evidence of Dupuytren disease. We compared 3 parameters of the radial and ulnar digital arteries, including differences in depth, differences in lateral shift, and the shape of the cross-section of the artery, between volunteers and patients with Dupuytren disease.
  
  
  RESULTS
  None of these parameters changed with flexion of the metacarpophalangeal joint of 0°, 30°, and 60°. Digital arteries and cords could be identified ultrasonographically in all patients, and we confirmed ultrasonographic findings by operative findings in 13 fingers. We classified the fingers into 3 subgroups based on the ultrasonographic findings: type A (n = 13), in which the cord was above the artery; type B (n = 5), in which the cord was below the artery; and type C (n = 7), in which the cord was located between the radial and ulnar digital arteries. Types A, B, and C corresponded to natatory cord/abductor digiti minimi cord, spiral cord, and central cord, respectively. Comparisons among volunteers and patient subgroups showed that the difference in depth in type B patients was significantly larger than that of the other groups. When we set the cutoff point of the difference in depth to 3 mm, sensitivity and specificity to detect the spiral cord were 80% and 76%, respectively.
  
  
  CONCLUSIONS
  The relationship between the neurovascular bundle and the type of Dupuytren disease cord can be evaluated by high-resolution ultrasound.
  
  
  METHODS
  Diagnostic III.
authors.affiliation: Department of Orthopaedic Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.
authors.forename: Kosuke
authors.initials: K
authors.lastname: Uehara
authors.forename: Toshiki
authors.initials: T
authors.lastname: Miura
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Morizaki
authors.forename: Hideaki
authors.initials: H
authors.lastname: Miyamoto
authors.forename: Takashi
authors.initials: T
authors.lastname: Ohe
authors.forename: Sakae
authors.initials: S
authors.lastname: Tanaka
mesh_terms: D001158:Arteries; D004387:Dupuytren Contracture / Q000000981:diagnostic imaging* / Q000503:physiopathology; D005385:Fingers / Q000098:blood supply / Q000000981:diagnostic imaging / Q000294:innervation*; D006801:Humans; D008662:Metacarpophalangeal Joint / Q000503:physiopathology; D018615:Ultrasonography, Doppler, Color