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What are spinal cord injuries? A spinal cord injury (SCI) happens when there’s damage to your spinal cord, a thick bundle of nerve fibers that allows your brain to communicate with other nerves almost everywhere else in your body. These injuries can range from minor and manageable to severe and permanent. The spinal cord is one of the two components of your central nervous system (CNS). Your nervous system is like a multilane expressway to and from your brain, the other component of the CNS. It has lanes for traffic leaving your brain and other lanes for traffic heading to your brain. Your spinal cord connects to your spinal nerves, which are like on- and off-ramps that connect to peripheral nerves that branch out everywhere else in your body. Nerve signals are the cars that travel this expressway and use those on- and off-ramps. Spinal cord injuries are like closures that affect the lanes in this expressway. But unlike a real-life expressway, the spinal cord has no detours. The traffic that uses the closed lanes can’t reach where it’s going. If the damage is severe enough, the closure might be permanent. That’s what causes paralysis and other severe SCI injury symptoms. Types of this condition There are two ways that experts organize the types of spinal cord injuries: By the way the injury affects your spinal cord and where in your spinal cord the injury happens. An SCI can interrupt nerve signal traffic going to and coming from anywhere below where it happens. By location Cervical spine: This section is in your neck. It goes from the bottom of your skull to about the same level as your shoulders. Thoracic spine: This section stretches from your upper back to just below your navel (belly button). Lumbar spine: This section is in your lower back. It extends about to the top of where your buttocks meet, but your spinal cord ends a couple of inches above that. Sacral spine: This section is in your back. It contains nerve roots below your butt to your tailbone. By severity Incomplete: An incomplete SCI is like a closure that only affects some lanes. Others remain open, so some abilities below the injury remain intact. Complete: A complete SCI affects all the lanes. No traffic gets through. It usually means permanent loss of all abilities below the injury, including paralysis. Your spinal cord has 31 segments (they line up with the 31 pairs of spinal nerves). Experts use letter-number combinations to designate them. The letter indicates the section of the spine, and the number indicates the segment. For example, C8 means the cervical spinal cord’s eighth (and lowermost) segment. SCIs also commonly involve multiple phases. The first phase is the initial injury. But in the following hours and days, a secondary injury can also develop, causing swelling and further damage to your spinal cord. How common are spinal cord injuries? Spinal cord injuries are uncommon. Between 250,000 and 500,000 happen every year worldwide. In the United States, there are about 18,000 new traumatic SCI cases each year. About 78% of people with a new SCI are male. The average age at the time of injury is 43. Symptoms and Causes What are the symptoms of a spinal cord injury? The symptoms of an SCI depend on the affected signals. There are three types of signals that an SCI can affect: sensory, motor and autonomic. Sensory symptoms Sensory signals carry information to your brain. They tell your brain about the world around you and what’s happening to your body. Your spinal cord mainly handles tactile (touch-based) signals. Examples include temperature, pressure, vibration, texture, etc. It also handles your self-positioning sense (proprioception). If you move your hand toward your face in a totally dark room but can stop your hand before it touches your nose, that’s an example of proprioception. Examples of sensory symptoms include: Pain. Numbness. Tingling or “pins-and-needles” (paresthesia). Motor symptoms Motor signals travel from your brain to your muscles. They’re how your brain moves parts of your body. Motor symptoms can include: Weakness (reduced strength). Paralysis (lack of muscle control). Spasticity (muscles that remain flexed uncontrollably). Autonomic symptoms Autonomic signals run processes you don’t have to think about (“autonomic” sounds like “automatic,” and autonomic signals handle automatic processes). Autonomic symptoms can include: Heart rate disruptions, especially slow heart rate (bradycardia). Blood pressure disruptions, especially low blood pressure (hypotension). Body temperature disruptions, especially low body temperature (hypothermia). Urinary incontinence or fecal incontinence. Erectile dysfunction. What can cause a spinal cord injury? Spinal cord injuries can happen for many reasons. Possible causes include (but aren’t limited to): Motor vehicle crashes. These are the most common cause. They make up more than 37% of all SCIs. Falls. They make up about 31% of all SCIs. Violence-related injuries. This includes penetrating injuries from bullets or sharp objects like knives. They make up about 15% of all SCIs. Sports-related injuries. These account for about 8% of SCIs. Diving is the most common sports-related spinal cord injury. Other common causes of or contributing factors to spinal cord injuries include: Conditions that make it easier for your bones to break, like osteopenia and osteoporosis. Spine tumors, including cancers. Cysts or fluid-filled cavities within your spinal cord (syringomyelia). Infections that attack your spinal cord, or cause swelling and inflammation in surrounding tissues that then press on your spinal cord. Lack of blood flow (ischemia) to your spinal cord. Congenital spinal conditions, such as myelomeningocele or spina bifida. Autoimmune or inflammatory conditions like Guillain-Barré syndrome, multiple sclerosis, neuromyelitis optica or transverse myelitis. Genetic conditions like hereditary spastic paraplegia. Electrocution (if the electric current travels along or near your spinal cord). What are the complications of spinal cord injuries? SCIs can have severe complications, many of which are permanent. SCIs commonly cause a partial or total loss of abilities in body parts below the injury. That can cause certain forms of paralysis: Tetraplegia (sometimes known as “quadriplegia”): This is paralysis from the neck down. It involves an injury to the cervical segments of your spinal cord. The complications can vary depending on the location of the injury. Paraplegia: This is paralysis that affects your lower body only. It involves an injury to the thoracic, lumbar or sacral segments of your spinal cord. The complications of this can also vary depending on the location of the injury, but usually affect body functions and abilities from your chest down. Other possible complications include: Autonomic dysreflexia (with injuries at or above T6, the sixth thoracic spinal nerve). Spinal (neurogenic) shock. Nerve pain (neuropathic pain). Pneumonia. Urinary tract infections. Blood clots in your legs and lungs. Pressure sores. Sepsis. Death (especially when the injury is higher up in your spine). Your healthcare provider is the best person to tell you more about the possible complications you might experience. They can also help you understand how to recognize and react to them. Diagnosis and Tests How are spinal cord injuries diagnosed? A healthcare provider can usually diagnose a spinal cord injury using multiple methods, including: A physical exam. Your provider does this to look for clues or evidence of the injury’s extent. A neurological exam. Your provider will do this to test specific abilities of your nervous system. This involves seeing if you can move your limbs by testing your strength and checking your sensation and reflexes. Imaging scans. Examples include computed tomography (CT) and magnetic resonance imaging (MRI) scans. CT scans are faster and show your provider bone-related injuries or problems. MRI scans take longer but provide ultra-detailed images of bones, soft tissues, nerves, etc. Diagnostic tests. Examples of these include electromyography and nerve conduction tests. They measure electrical signals reaching your muscles, which can help locate nerve or spinal cord damage interfering with signals. Management and Treatment How are spinal cord injuries treated? The treatment for SCIs varies widely. The first distinction is whether or not it’s injury-related. A suspected trauma-related SCI is ALWAYS a medical emergency. SCIs due to certain other causes are also medical emergencies. Emergency causes include: Infections. These can rapidly become deadly when not treated. Lack of blood flow (ischemia). Restoring blood flow is a critical, lifesaving priority. Autoimmune conditions. These can also cause severe complications without quick treatment when they develop suddenly (such as with Guillain-Barré syndrome). When to see a doctor Anyone who has an injury to the head or neck needs an immediate medical evaluation. It is safest to assume that the person has a spinal injury until proved otherwise. This is important because: A serious spinal injury is not always immediately obvious. If a spinal injury occurs but it is not known, worse injury may occur. Numbness or paralysis can happen quickly or come on gradually. The time between injury and treatment can be critical. Learning the level of the injury can help determine the possible recovery.

Key Specification Spinal Cord Injury

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