title: Extensor musculature of the cervical spine after laminoplasty: morphologic evaluation by coronal view of the magnetic resonance image.
abstract: METHODS
  A radiographic study in 22 patients using magnetic resonance imaging was conducted.
  
  
  OBJECTIVE
  To describe the relation between postoperative cervical alignment and morphologic evaluation of the cervical extensor musculature, especially semispinalis cervics in laminoplasty.
  
  
  BACKGROUND
  Cervical laminoplasty has been widely accepted as a treatment for cervical myelopathy. Posterior procedures, however, involve the extensor musculature of the cervical spine.
  
  
  METHODS
  In this study, 22 patients who underwent laminoplasty for repair of the extensor musculature were reviewed prospectively. The semispinalis cervics was evaluated by coronal view of the magnetic resonance image 1 month, 12 months, and 24 months after surgery. Cervical alignment at last follow-up assessment was compared with preoperative alignment using the lateral view of cervical radiographs.
  
  
  RESULTS
  In 18 patients (82%), morphologic repair of semispinalis cervics had been maintained (Group A), but in 4 patients (18%), but it had not been maintained at the last follow-up assessment (Group B). Cervical alignment in Group A had been maintained, but maximum loss of cervical lordosis occurred in Group B. Moreover, Group B consisted of elderly women.
  
  
  CONCLUSIONS
  The findings from this magnetic resonance imaging study suggest that the degree of semispinalis cervics repair affects postoperative cervical alignment, and significant loss of cervical lordosis tends to occur in elderly women who undergo laminoplasty.
authors.affiliation: Section of Orthopaedic Surgery, Geriatrics Research Institute and Hospital, Gunma, Japan. ihaku@showa.gunma-u.ac.jp
authors.forename: H
authors.initials: H
authors.lastname: Iizuka
authors.forename: T
authors.initials: T
authors.lastname: Shimizu
authors.forename: K
authors.initials: K
authors.lastname: Tateno
authors.forename: N
authors.initials: N
authors.lastname: Toda
authors.forename: H
authors.initials: H
authors.lastname: Edakuni
authors.forename: H
authors.initials: H
authors.lastname: Shimada
authors.forename: K
authors.initials: K
authors.lastname: Takagishi
mesh_terms: D000328:Adult; D000368:Aged; D002574:Cervical Vertebrae / Q000000981:diagnostic imaging / Q000601:surgery*; D005260:Female; D006801:Humans; D007796:Laminectomy / Q000009:adverse effects*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000473:pathology* / Q000601:surgery; D011446:Prospective Studies; D011859:Radiography; D019651:Plastic Surgery Procedures / Q000009:adverse effects*; D014945:Wound Healing