title: Effect of the number of involved spinal cord segments on gait function in patients with cervical spondylotic myelopathy.
abstract: METHODS
  Retrospective.
  
  
  OBJECTIVE
  To determine the effect of severity of cervical spondylotic myelopathy (CSM) on gait parameters according to the number of involved spinal cord segments.
  
  
  BACKGROUND
  Although there are a large number of studies on CSM, almost all studies have focused on hand function and only a few studies have examined the gait function in patients with CSM.
  
  
  METHODS
  Twenty-three patients with CSM underwent magnetic resonance imaging and gait analysis. The subjects were divided into 2 groups; group I consisted of 9 patients with a single-level stenotic lesion and group II comprised 14 patients with multi-level stenotic lesions. Gait parameters were compared between the 2 groups and the normal control group.
  
  
  RESULTS
  There was no significant difference in the Japanese Orthopaedic Association score between the 2 groups. Cadence, walking speed, stride length, and step length were decreased in group II compared to group I and normal control group. Peak ankle plantar flexion moments during the stance phase and peak knee flexion angle during the swing phase were decreased in group II. Peak ankle, knee, and hi p power generation during the stance phase were decreased in group II; in addition, the peak ankle power generation was decreased in group II than in the normal control group.
  
  
  CONCLUSIONS
  Patients with multi-level stenotic lesions had decreased gait ability compared to that in patients with a single-level stenotic lesion. The number of involved spinal cord segments can be one cause of gait deterioration in patients with CSM. Performing a gait analysis is useful for accurate evaluation of the patient.
authors.affiliation: Motion Analysis Laboratory, Inje University Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea.
authors.forename: Ji Yeon
authors.initials: JY
authors.lastname: Yoon
authors.forename: Han
authors.initials: H
authors.lastname: Chang
authors.forename: Kun Bo
authors.initials: KB
authors.lastname: Park
authors.forename: Sang Jin
authors.initials: SJ
authors.lastname: Lee
authors.forename: Byung Wan
authors.initials: BW
authors.lastname: Choi
keywords: Cervical spondylotic myelopathy; Gait analysis; Multi-level