title: Correlation between "hourglass-like fascicular constriction" and idiopathic anterior interosseous nerve palsy.
abstract: In recent operative cases of anterior interosseous nerve palsy (AINP), hourglass-like fascicular constrictions have been reported. We prospectively investigated the ultrasonographic history of these lesions to better understand the role of this lesion in AINP.
  
  
  
  Seven patients who were diagnosed with idiopathic AINP based on classic clinical findings and had hourglass-like fascicular constrictions found on ultrasonography were included. All but 1 patient selected surgery, and we followed up all patients clinically and with ultrasonography.
  
  
  
  In the 5 patients treated surgically in whom paralysis recovered to a level greater than M4, postoperative ultrasonography revealed less constriction. The other patient experienced little recovery after surgery, and the severe constriction remained. In a conservatively treated patient, the paralysis recovered completely, and upon ultrasonography, the constriction had lessened.
  
  
  
  Although the mechanism is still unknown, hourglass-like fascicular constriction lessened with relief of motor weakness both in operatively and conservatively treated patients. Muscle Nerve 55: 508-512, 2017.
authors.affiliation: Department of Orthopedic Surgery, Hiroshima University Hospital, 1-2-3 Kasumi, Hiroshima, 734-8551, Japan.|Laboratory of Analysis and Control of Upper Extremity Function, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Sunagawa
authors.affiliation: Department of Orthopedic Surgery, Hiroshima University Hospital, 1-2-3 Kasumi, Hiroshima, 734-8551, Japan.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Nakashima
authors.affiliation: Department of Orthopedic Surgery, Hiroshima University Hospital, 1-2-3 Kasumi, Hiroshima, 734-8551, Japan.
authors.forename: Rikuo
authors.initials: R
authors.lastname: Shinomiya
authors.affiliation: Laboratory of Analysis and Control of Upper Extremity Function, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kurumadani
authors.affiliation: Department of Orthopedic Surgery, Hiroshima University Hospital, 1-2-3 Kasumi, Hiroshima, 734-8551, Japan.
authors.forename: Nobuo
authors.initials: N
authors.lastname: Adachi
authors.affiliation: Department of Orthopedic Surgery, Hiroshima University Hospital, 1-2-3 Kasumi, Hiroshima, 734-8551, Japan.
authors.forename: Mitsuo
authors.initials: M
authors.lastname: Ochi
mesh_terms: D000328:Adult; D003251:Constriction, Pathologic / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D005260:Female; D005542:Forearm / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D019635:Neurosurgical Procedures / Q000379:methods; D020127:Recovery of Function / Q000502:physiology; D020424:Ulnar Neuropathies / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D055815:Young Adult
keywords: anterior interosseous nerve; follow-up; hourglass-like constriction; nerve fascicle; peripheral nerve palsy; ultrasonography