Definition/Description
Spinal cord injury is defined as traumatic damage to the spinal cord or nerves at the end of the spinal canal. This affects conduction of sensory and motor signals across the site of the lesion.
There are two types: incomplete and complete injury. [1]
• Incomplete Lesion: not all the nerves are severed or the nerves are only slightly damaged. Recovery is possible, but never to pre-injury level.
• Complete lesion: the nerves are severed and there is no motor or sensory function preserved of this point.
Clinically Relevant Anatomy
The spinal cord is the major conduit through which motor and sensory information travels between brain and body. The spinal cord contains longitudinally oriented spinal tracts (white matter) surrounding central areas (gray matter) where most spinal neuronal cell bodies are located.
The gray matter is organized into segments comprising sensory and motor neurons. Axons from spinal sensory neurons enter and axons from motor neurons leave the spinal cord via segmental nerves or roots. The roots are numbered and named according to the foramina through which they enter/exit the vertebral column. Each root receives sensory information from skin areas called dermatomes. Similarly, each root innervates a group of muscles called a myotome.
The spinal column is divided into four regions: Cervical (7 vertebrae), thoracic (12 vertebrae), lumbar (5 vertebrae) and sacral (5 vertebrae). [2]
Epidemiology/Etiology
A recent systematic review found the prevalence of Spinal Cord Injury to be dependent on the region the studies were conducted in, ranging from 906 per million in the USA up to 250 per million in Rhone-Alpes, France.[3] Annual incidence rates also varied significantly between region, ranging from 49.1 per million in New Zealand to 8.0 per million in Spain. [3] A further review found similar results with prevalence ranging from 1298 per million to 50 per million and incidence ranging from 246 per million to 3.3 per million.[4] These results indicate that the incidence, prevalence and causation of Spinal Cord Injury can differ significantly between developing and developed countries (high in developed countries).
Strong inconsistencies in data were noted when analysed between countries but the most frequent causes of Spinal Cord Injury reported are, in order; [4]
- Motor Vehicle Accidents
- Falls
- Sport Injuries
- Violence
- Self-harm
- Work-related Accidents.
Data from the National Spinal Cord Injury Statistical Center (USA) 2010 – 2014 provided the following statistics for etiology (illustration). Other interesting statistics from this report include:
- Males account for 80% of new cases
- Average age at injury has gone up from 29 years old (1970) to 42 years old currently.
- Only about 12% of patients are employed 1 year after trauma, rising to 34.4% 20 years post injury
- Life expectancy decreases for all individuals with Spinal Cord Injury, compared to those without a spinal cord injury.
Characteristics / Clinical Presentation
As spinal cord injuries are by definition caused by traumas, the primary examination and presentation will be done in an emergency response setting. Initial evaluation includes pulmonary evaluation to determine loss of ventilatory function and/or lung injury. Signs of haemorrhage and neurogenic shock are also checked in this initial evaluation. • Aortic Artery Dissection The ideal management of acute spinal cord injury is a combination of pharmacological therapy, early surgery, aggressive volume resuscitation and blood pressure elevation to maximize spinal cord perfusion, early rehabilitation and cellular therapies.[6] There is still no commonly accepted pharmacological agent.[6] The most important candidates are:
Glucocorticoids (Methylprednisolone), which suppress many of the ‘secondary’ events of spinal cord injury. These are inflammation, lipid peroxidation and excitotoxity. Randomised clinical trials are contradictory in their results and so are the opinions of experts.[7] Thyrotropin-releasing Hormone (TRH) shows antagonistic effects against the secondary injury mediators.[6] Early surgical decompression results in a better neurological outcome.
The aim of cellular therapies is to provide functional recovery of deficit through axonal regeneration and restoration. Imaging technology is an important part of the diagnostic process of acute or chronic spinal cord injuries. Spinal cord injuries can be detected using different types of imaging which depends on the type of underlying pathology. MRI has become the golden standard for imaging neurological tissues such as the spinal cord, ligaments, discs and other soft tissues. Only MRI sequences of sagittal T2 were found to be useful for prognosticative purposes. [9] Spinal fractures and bony lesions are better characterized by computed tomography (CT) and vascular injuries van be detected by using an MR angiography or by a CT scan.[10] A diagnosis can be made through a thorough history and examination. By performing a neurological examination, if possible to participate in a reliable physical neurological examination, for the sensory and motoric functions of the body in the corresponding area of complaints. After the examination we can make a judgement of the severity and the location of the injury.[13] If the place of injury is diagnosed we can perform some extra examinations as described on the following pages: The rehabilitation of patients who had a spinal cord injury depends on which level of the spine the injury occurred . Also the therapy depends on whether it was a complete or an incomplete spinal cord injury. In case of an incomplete spinal cord injury 25% do not become independent ambulators. The therapies differ according to where the lesion happened, cervical, thoracic or lumbar. The rehabilitation of SCI is a multidisciplinary approach! [14][15] Possible Upper Incomplete SCI Therapy: Possible Lower Incomplete SCI Therapy: New therapies are emerging and showing positive evolution, such as the robotic-assisted gait training. This therapy uses a treatment of 40 minutes twice a day at a rate of 5 times a week. 3 days using the robotic-gait training and 2 days regular physical therapy. Included in the regular physical therapy are, functional electrical stimulation and physical therapy using the Bobath principles.[14][19] Complete recovery after incomplete or complete SCI is never attainable.[14][19][16] Singh, A. et al. “Global prevalence and incidence of traumatic spinal cord injury”, Clin. Epidemiol. 2014; 6: 309-331. (level of evidence 1A) ASIA – International Standards for Neurological Classification of SCI (ISNCSCI) Exam Website of National Spinal Cord Injury Statistical Center (NSCISC) – Accessed 18/11/2015 Spinal cord injuries are a serious, widespread health issue resulting in a large amount of disfunction and as such have a big socio-economic impact.
Finally, and most relevant to physical therapy, neurologic assessment is done which includes checking motor function, sensory evaluation, deep tendon reflexes and perineal evaluation.[5]
The ASIA (American Spinal Injury Association) has established an international standard neurological which can be used to classify the lesion according to a specific cord syndrome. This includes motor and sensory evaluation. This also includes an impairment scale which indicates severity of the lesion.
(for more information see Differential Diagnosis
• Epidural and Subdural Infections
• Spinal Cord Infections
• Syphilis (Tertiary)
• Vertebral Fracture
• Medical Management
Pharmacological Intervention
For more information, see [8]Surgical Intervention
Cellular Therapy Interventions
Schwann Cell is one of the most widely used cell types for repair of the spinal cord.
Olfactory Ensheating Cells are capable of promoting axonal regeneration and remyelination after injury.
Bone Marrow derived Mononuclear Cells (BM-MNC’s) transplantation is feasible, safe and have a good degree of outcome improvement.
Stimulated Macrophages invade the impaired tissue.[6]Diagnostic Procedures
Outcome Measures
– Instruments to measure impairments
– Instruments to measure disabilityExamination
• Physical Therapy Management
When the cervical spine is injured, the consequences for the patient are life changing. Patients need therapy for movement and strength recovery of the upper body and probable respiratory training.[15][16] Respiratory muscle training consists of inspiratory, expiratory or both improvement in muscle strength and endurance. Normocapnic hyperpnoea is a method of respiratory muscle endurance training that simultaneously trains the inspiratory and expiratory muscles. This device consists of a re-breathing bag that works at 30 to 40% of the patient’s vital capacity and is connected to a tube system and mouthpiece.[17] The patient must fill and empty the bag completely with each breath. Other respiratory muscle training exists and are also effective.[18]
Training of the upper limb after SCI consists usually of specific exercises or conventional therapy using Bobath principles combined with functional electrical stimulation.[15]
The main limitations with lower incomplete SCI patients, is that they have a reduced coordination, leg paresis and impaired balance.[14] These limitations can be worked on with the use of braces and tilt tables. If the leg strength improves, therapists can use braces, parallel bars and other walking aids to work on the balance weight bearing of the patient. In combination with those instruments, the therapist needs to train the patient using repetitive and intensive practice of gait. The use of a treadmill with overhead harness is applied to certain SCI cases and only by choice of the therapist. Thanks to the harness, patients can more easily focus on their gait under supervision of their therapist. In addition to this therapy, the use of functional electrical stimulation is needed to optimize rehabilitation of the patient.[14][19]Key Research
Furlan, J.C. et al. “Global incidence and prevalence of traumatic spinal cord injury.” Can J Neurol Sci. 2013 Jul;40(4):456-64. (level of evidence = 1A)
V. Cheung et al., Methylprednisolone in the management of spinal cord injuries: Lessons from randomized, controlled trials. (level of evidence =1A)
Xiao Lu et al., effects of training on upper limb function after cervical spinal cord injury: a systematic review, clinical rehabilitation 2015, vol. 29(1) 3-13 (level of evidence = 1A)
J.C.Shin et al., effect of robotic-assisted gait training in patients with incomplete spinal cord injury, Ann Rehabil Med 2014;38(6):719-725 ( level of evidence = 1B)
Berlowitz D et al., respiratory muscle training for cervical spinal cord injury, Cochrane Database of Systematic Reviews 2013, Issue 7. Art. No.: CD008507. DOI: 10.1002/14651858.CD008507.pub2.(level of evidence 1A)
Anthony B. et al., The Role of Magnetic Resonance Imaging in the Management of Acute Spinal Cord Injury, J Neurotrauma. 2011 Aug; 28(8): 1401–1411. (level of evidence 1B)
M R Hill et al., Quality of life instruments and definitions in individuals with spinal cord injury: a systematic review, Spinal Cord (2010) 48, 438–450 (level of evidence 1A)
Resources
Clinical Bottom Line
Therapy is multidisciplinary and focus should be on regaining of function (relevant to the patient!), as tissue recovery is often impossible.References
