title: Gait cycle analysis: parameters sensitive for functional evaluation of peripheral nerve recovery in rat hind limbs.
abstract: BACKGROUND
  Video-assisted gait kinetics analysis has been a sensitive method to assess rat sciatic nerve function after injury and repair. However, in conduit repair of sciatic nerve defects, previously reported kinematic measurements failed to be a sensitive indicator because of the inferior recovery and inevitable joint contracture.
  
  
  OBJECTIVE
  This study aimed to explore the role of physiotherapy in mitigating joint contracture and to seek motion analysis indices that can sensitively reflect motor function.
  
  
  METHODS
  Data were collected from 26 rats that underwent sciatic nerve transection and conduit repair. Regular postoperative physiotherapy was applied. Parameters regarding step length, phase duration, and ankle angle were acquired and analyzed from video recording of gait kinetics preoperatively and at regular postoperative intervals.
  
  
  RESULTS
  Stride length ratio (step length of uninjured foot/step length of injured foot), percent swing of the normal paw (percentage of the total stride duration when the uninjured paw is in the air), propulsion angle (toe-off angle subtracted by midstance angle), and clearance angle (ankle angle change from toe off to midswing) decreased postoperatively comparing with baseline values. The gradual recovery of these measurements had a strong correlation with the post-nerve repair time course.
  
  
  CONCLUSIONS
  Ankle joint contracture persisted despite rigorous physiotherapy. Parameters acquired from a 2-dimensional motion analysis system, that is, stride length ratio, percent swing of the normal paw, propulsion angle, and clearance angle, could sensitively reflect nerve function impairment and recovery in the rat sciatic nerve conduit repair model despite the existence of joint contractures.
authors: From the *Department of Neurologic Surgery, Mayo Clinic, Rochester, MN; †Department of Hand Surgery, Huashan Hospital, Fudan University, Shanghai, People's Republic of China; ‡Departments of Orthopedic Surgery and Biomedical Engineering, and §Department of Neurology, Mayo Clinic, Rochester, MN; and ∥Shanghai Key Laboratory of Peripheral Nerve and Microsurgery, Shanghai, People's Republic of China.
authors: Jing
authors: J
authors: Rui
authors: M Brett
authors: MB
authors: Runge
authors: Robert J
authors: RJ
authors: Spinner
authors: Michael J
authors: MJ
authors: Yaszemski
authors: Anthony J
authors: AJ
authors: Windebank
authors: Huan
authors: H
authors: Wang
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D003286:Contracture / Q000209:etiology / Q000517:prevention & control*; D005260:Female; D005684:Gait; D006614:Hindlimb; D009416:Nerve Regeneration; D026741:Physical Therapy Modalities; D011182:Postoperative Care; D011183:Postoperative Complications / Q000517:prevention & control*; D016059:Range of Motion, Articular; D051381:Rats; D020127:Recovery of Function; D012584:Sciatic Nerve / Q000293:injuries / Q000502:physiology / Q000601:surgery*; D013647:Task Performance and Analysis; D014741:Video Recording