title: Kinematic characteristics of tenodesis grasp in C6 quadriplegia.
abstract: METHODS
  Descriptive control case study.
  
  
  OBJECTIVE
  To analyze the kinematics of tenodesis grasp in participants with C6 quadriplegia and healthy control participants in a pointing task and two daily life tasks involving a whole hand grip (apple) or a lateral grip (floppy disk).
  
  
  METHODS
  France.
  
  
  METHODS
  Four complete participants with C6 quadriplegia were age matched with four healthy control participants. All participants were right-handed. The measured kinematic parameters were the movement time (MT), the peak velocity (PV), the time of PV (TPV) and the wrist angle in the sagittal plane at movement onset, at the TPV and at the movement end point.
  
  
  RESULTS
  The participants with C6 quadriplegia had significantly longer MTs in both prehension tasks. No significant differences in TPV were found between the two groups. Unlike control participants, for both prehension tasks the wrist of participants with C6 quadriplegia was in a neutral position at movement onset, in flexion at the TPV, and in extension at the movement end point.
  
  
  CONCLUSIONS
  Two main kinematic parameters characterize tenodesis grasp movements in C6 quadriplegics: wrist flexion during reaching and wrist extension during the grasping phase, and increased MT reflecting the time required to adjust the wrist's position to achieve the tenodesis grasp. These characteristics were observed for two different grips (whole hand and lateral grip). These results suggest sequential planning of reaching and tenodesis grasp, and should be taken into account for prehension rehabilitation in patients with quadriplegia.
authors.affiliation: INSERM U1028, CNRS UMR5292, Lyon Neuroscience Research Center, ImpAct Team, Lyon, France. sebastien.mateo@chu-lyon.fr
authors.forename: S
authors.initials: S
authors.lastname: Mateo
authors.forename: P
authors.initials: P
authors.lastname: Revol
authors.forename: M
authors.initials: M
authors.lastname: Fourtassi
authors.forename: Y
authors.initials: Y
authors.lastname: Rossetti
authors.forename: C
authors.initials: C
authors.lastname: Collet
authors.forename: G
authors.initials: G
authors.lastname: Rode
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D002574:Cervical Vertebrae; D005260:Female; D018737:Hand Strength / Q000502:physiology*; D006801:Humans; D008297:Male; D009068:Movement / Q000502:physiology*; D011782:Quadriplegia / Q000209:etiology / Q000503:physiopathology*; D013119:Spinal Cord Injuries / Q000150:complications / Q000503:physiopathology*