Nerve conduction study in cervical spinal cord injury: significance for hand function

1996 ◽  
Vol 7 (3) ◽  
pp. 165-173 ◽  
Author(s):  
A Curt
2021 ◽  
pp. 1-7
Author(s):  
Allan D. Levi ◽  
Jan M. Schwab

The corticospinal tract (CST) is the preeminent voluntary motor pathway that controls human movements. Consequently, long-standing interest has focused on CST location and function in order to understand both loss and recovery of neurological function after incomplete cervical spinal cord injury, such as traumatic central cord syndrome. The hallmark clinical finding is paresis of the hands and upper-extremity function with retention of lower-extremity movements, which has been attributed to injury and the sparing of specific CST fibers. In contrast to historical concepts that proposed somatotopic (laminar) CST organization, the current narrative summarizes the accumulated evidence that 1) there is no somatotopic organization of the corticospinal tract within the spinal cord in humans and 2) the CST is critically important for hand function. The evidence includes data from 1) tract-tracing studies of the central nervous system and in vivo MRI studies of both humans and nonhuman primates, 2) selective ablative studies of the CST in primates, 3) evolutionary assessments of the CST in mammals, and 4) neuropathological examinations of patients after incomplete cervical spinal cord injury involving the CST and prominent arm and hand dysfunction. Acute traumatic central cord syndrome is characterized by prominent upper-extremity dysfunction, which has been falsely predicated on pinpoint injury to an assumed CST layer that specifically innervates the hand muscles. Given the evidence surveyed herein, the pathophysiological mechanism is most likely related to diffuse injury to the CST that plays a critically important role in hand function.


2019 ◽  
Vol 7 (3) ◽  
pp. 129-135 ◽  
Author(s):  
Wenbin Ding ◽  
Shaocheng Zhang ◽  
Dajiang Wu ◽  
Yanpeng Zhang ◽  
Hualong Ye

Objective:The objective of this study was to show that hand functions could be recovered using nerve segment insert grafting in quadriplegic patients with chronic incomplete lower cervical spinal cord injury (CSCI) (C5/6/7/8).Methods:A retrospective analysis was performed in 18 quadriplegic patients (12 male and 6 female patients; mean age, 27 years; age range, 17–55 years) with chronic incomplete lower CSCI who had undergone nerve segment insert grafting from January 2001 to June 2015. Among the 18 patients, the right upper limb was involved in 7, left upper limb in 4, and bilateral upper limbs in 7 patients.Results:The mean follow-up period was 16 months (range, 3 months–3 years), and all patients exhibited obvious relief of limb spasm. Among all patients, 15 patients experienced no obvious spasm attacks and exhibited recovery of living abilities, i.e., recovery of the hand functions of grasping, holding, and pinching, and recovery of pain and temperature sensation in the fingers and palms; furthermore, they were able to steer an ordinary wheelchair independently postoperatively. The remaining three patients exhibited a significant and continuous improvement in hand functions over time, without any significant donor nerve dysfunction.Conclusions:Nerve segment insert grafting is an effective method that helps recover hand functions in quadriplegic patients with chronic incomplete lower CSCI. Moreover, spasticity can be relieved and partial normal innervation can be obtained in the spastic muscles postoperatively.


2008 ◽  
Vol 18 (2) ◽  
pp. 53-61 ◽  
Author(s):  
Rosalynn Miller ◽  
Milos Popovic ◽  
Adam Thrasher ◽  
Molly Verrier

OBJECTIVE AND IMPORTANCE: To present case studies of two individuals with chronic cervical spinal cord injury (SCI) who participated in functional electrical stimulation (FES) therapy with the objective to restore voluntary grasp function. CLINICAL PRESENTATION: Both individuals (right hand dominant males, age 24 and 31) had a sustained a cervical SCI (C6 and C4-5, respectively) at least 8 years prior to participation in this study. INTERVENTION: Both individuals participated in an individualized FES therapy program for 6 weeks. FES therapy was administered through a regimen of three, one-hour sessions, per week for three months. A single arm of each participant (n = 2) was treated. FES therapy is an integrative intervention strategy combining muscle strengthening, functional movement training and stretching. The participant's hand movement abilities were assessed pre and post FES therapy using the Manual Muscle Test (MMT), a modified Sollerman Hand Function Test (mSHFT), and the Reach, Grasp, Transport and Release Task (RGTR). DISCUSSION: As the injuries of participants in the current study were chronic and thus neurologically stable, no spontaneous improvements/recovery in hand function was expected. However, FES as part of an integrated therapeutic approach affected restoration and improvement of hand function in both participants. CONCLUSION: The concurrent improvement in strength, integrated motor function and object contact following FES therapy, demonstrated that there is potential for affecting change in hand function of individuals with chronic SCI.


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