Lumbar Spinal Cord Injury: Understanding L1, L2, L3, L4, L5 SCI (2023)

A lumbar spinal cord injury can cause varying degrees of paralysis in the lower body, also known asparaplegia. With effective management strategies, individuals with lumbar spinal cord injuries can maximize their functional abilities and lead fulfilling lives.

To help you understand what to expect after a lumbar spinal cord injury, this article will discuss:

  • Definition
  • Functions Affected
    • L1 Spinal Cord Injury
    • L2 Spinal Cord Injury
    • L3 Spinal Cord Injury
    • L4 Spinal Cord Injury
    • L5 Spinal Cord Injury
  • Complete vs. Incomplete Lumbar SCI
  • Potential Complications
  • Recovery Methods

What is a Lumbar Spinal Cord Injury?

The lumbar region of the spinal cord consists of 5 segments, based on the five lumbar vertebrae. Each segment connects to a different area of skin for sensation and muscles for movement. When the spinal cord is partially or completely severed in this area, it is referred to as a lumbar spinal cord injury.

Traumatic lumbar spinal cord injuries are caused by an external force, such as a car accident, fall, or violence. In contrast, non-traumatic causes of lumbar spinal cord injury include tumor/cancer, infection, autoimmune disease, herniated disc/spinal stenosis, or a vascular event such as a spinal stroke.

Damage to the lumbar spinal cord can affect motor and sensory functions at and below the level of injury, while functions above the level of injury remain intact. Therefore, most individuals who have sustained a lumbar spinal cord injury experience sensory and/or motor deficits in their lower body, but can use their upper body and trunk normally.

Functions Affected by Lumbar Spinal Cord Injury

Lumbar Spinal Cord Injury: Understanding L1, L2, L3, L4, L5 SCI (1)

The level of spinal cord injury refers to the lowest level of the spinal cord in which sensory and motor functions remain intact. Medical professionals often use theInternational Standards for Neurological Classificationto determine thelevel of spinal cord injury. This involves testing sensation and motor functions in various areas of the body.

Because messages between the brain and body cannot pass through spinal cord damage, motor functions and sensationbelow the level of injurymay be impaired.

The following list explains which functions may be affected at each level of lumbar spinal cord injury:

L1 Spinal Cord Injury

L1spinal nerves affect movement and sensation of the pelvic/hip region. While motor and sensory functions in these areas will be intact with an L1 SCI, the legs may be completely paralyzed or lack sensation. Additionally, bowel and/or bladder function may be affected.

L2 Spinal Cord Injury

L2spinal nerves affect sensation in the front portion of the upper thighs. The muscles involved in bending the hips (hip flexors) and bringing the legs together (hip adductors) are also connected to the spinal cord at this level. Thus, individuals with an L2 spinal cord injury will be able to feel their upper thighs and move their hips, but may be unable to move or feel their lower legs.

L3 Spinal Cord Injury

L3spinal nerves affect sensation at the front portion of the lower thighs and knees, as well as the ability to straighten the knees (knee extension) and rotate the hip outward (external rotation). Individuals with a lumbar spinal cord injury at this level will therefore have more hip and knee movement, but may lack sensation and movement in the ankles and lower legs.

L4 Spinal Cord Injury

L4spinal nerves affect sensation at the front and inner regions of the lower legs. The ability to lift the foot upwards (ankle dorsiflexion) is primarily tested to determine whether this level of the spinal cord has been injured. However, many other motor functions are also connected at this level. Hip functions affected by the L4 spinal nerves include the ability to bring the leg back (hip extension), pull the leg outward (hip abduction), and rotate the hip inward (internal rotation).

Bending of the knee (knee flexion), side to side movement of the ankle (inversion and eversion), as well as straightening of the toes (toe extension) are also controlled by the spinalnervesat this level. Following an L4 spinal cord injury, hip, knee and some ankle functions are intact, while sensation and motor control of the foot may be affected.

L5 Spinal Cord Injury

L5spinal nerves affect sensation at the outer areas of the lower legs down to the big, second, and middle toes. The ability to bend and straighten the big toe (flexion and extension) and the ability to separate the toes (abduction) are also affected by L5 spinal nerves. Therefore, individuals with a lumbar spinal cord injury at this level will have feeling and movement in the feet, but may still lack feeling in the back of the leg and some ankle movement.

Complete vs. Incomplete Lumbar Spinal Cord Injury

Lumbar Spinal Cord Injury: Understanding L1, L2, L3, L4, L5 SCI (2)

Even individuals with the same level of injury may experience different secondary effects depending on the severity of injury. While individuals withcomplete spinal cord injurieslose all motor control and feeling below their level of injury, those withincomplete spinal cord injurieswill retain partial motor control and/or sensation below the level of injury.

In a complete spinal cord injury, the spinal cord is completely severed, leaving no spared neural pathways. This eliminates all pathways for communication between the brain and areas below the level of injury.

When the spinal cord is only partially severed, as occurs in an incomplete spinal cord injury, some neural pathways remain undamaged. Therefore, connections between areas below the level of injury and the brain still exist.

These spared neural pathways play an essential role in the recovery of lumbar spinal cord injuries (and all other SCIs). Since damaged neurons (nerve cells) in the spinal cord are not capable of regeneration, only spared neural pathways can be adapted and rewired through a process called neuroplasticity. Neuroplasticity allows spared neural pathways in the spinal cord to compensate for the pathways that were damaged.

In turn, this allows individuals to relearn functions after an incomplete spinal cord injury. There must be spared neural pathways in order for this to occur, so the more spared neural pathways that exist, the higher your potential for recovery.

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Potential Complications of Lumbar Spinal Cord Injury

No two spinal cord injuries are alike and individuals can experience a wide range of secondary complications. Generally, more severe spinal cord injuries carry a greater risk of complications.

Some potential complications following a lumbar spinal cord injury include:

  • Spasticity:involuntary muscle contractions that can cause stiff movements, muscle tightening and spasms
  • Neurogenic bowelandbladder:loss of control over the bowel and bladder muscles that can increase the risk of leaking, constipation, and urinary retention
  • Sexual dysfunction:impaired sexual functions due to the injury impeding the reflexes involved in sexual arousal. Loss of sensation and lack of lower body mobility also play a role in impaired sexual functioning
  • Chronic pain:pain can be the result of overdependence on unaffected areas (i.e over-reliance on shoulders for wheelchair mobility), bowel and bladder problems, or nerve damage
  • Muscle atrophy:reduced physical activity and limited weight-bearing can cause the leg muscles to weaken and shrink
  • Pressure sores:sitting or lying in the same position for prolonged periods places too much pressure on the skin, causing inflammation and breakdown over time

In the following section, we’ll discuss how to manage complications and promote recovery after a lumbar spinal cord injury.

Lumbar Spinal Cord Injury Recovery

Recovery outcomes following a lumbar spinal cord injury vary depending on the level and severity of the injury. With proper treatment and management techniques, many individuals are able to participate in most of their day-to-day activities with minimal or no difficulty.

Unless other medical complications are present, individuals with lumbar spinal cord injuries have normal functioning of their upper bodies. Therefore, many individuals learn to use their upper body to compensate for deficits in sensation and movement of their lower body.

Methods to help you improve and embrace life after lumbar spinal cord injury include:

Rehabilitative Therapies

Physical therapyuses targeted exercises to improve mobility, strength, and flexibility, while occupational therapy focuses on regaining independence in daily activities. Occupational therapists may encourage using adaptive techniques as necessary.

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Medical Equipment

Common types of medical equipment for lumbar spinal cord injury include:

  • Orthotics: wearable devices to promote musculoskeletal alignment
  • Mobility devices: wheelchairs, walkers, canes, etc.
  • Adaptive equipment: tools to assist with daily activities, such as a leg lifter
  • Other medical equipment: shower chairs, raised toilet seats, etc.
  • Car adaptations: such as hand controls or wheelchair locking mechanisms
  • Exoskeletons: robotic exoskeletons are currently being studied, but show promising results for allowing individuals with complete lumbar spinal cord injuries to walk again

Talk with your doctor or therapist about what equipment may be beneficial for you.

Emotional Support

The emotional effects of a lumbar spinal cord injury can be as challenging as the physical effects. Joining a SCI support groupcan help you connect with others who understand what you’re going through. For more individualized care, psychotherapymay be used to help you cope with the secondary effects of your injury.

Medical Interventions

Medicationsmay be prescribed to help manage secondary complications such as pain, constipation, and spasticity. Additionally, surgerymay be recommended for some individuals to decompress the spinal cord, stabilize the spinal column, manually lengthen spastic tendons and muscles, and minimize the hyperactivity of spastic muscles.

Lifestyle Adaptations

Creating a routinecan encourage consistency with your exercises and medications. It can also help you better predict your bladder and bowel movements. Although improvements are possible, embracing your current abilities and engaging in activities you value is important at all stages of recovery.

Thanks to the Americans with Disabilities Act, most restaurants, stores, and other public places are wheelchair accessible. For those who are used to being more active, many areas have adaptive sports, and rentals for off-roading track chairs are becoming more popular.

By learning how to maximize functional abilities, individuals with lumbar spinal cord injuries can achieve a good quality of life and pursue engaged, active lifestyles.

Understanding Lumbar SCI

Lumbar spinal cord injuries can affect movement and sensation in the lower body. However, because lumbar SCI’s do not affect upper body functions, individuals generally learn to adapt and live independent, fulfilling lives. Hopefully this article helped you understand what to expect following a lumbar spinal cord injury and how to promote recovery.

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