# Spinal Cord Injury: Acute Management and Prognosis

## Introduction

Spinal cord injury (SCI) is a devastating condition that demands rapid, systematic evaluation and intervention. The orthopedic surgeon plays a critical role in the acute stabilization of the spinal column and in establishing the foundation for neurological recovery. Understanding the mechanisms, classification, and time-sensitive management principles is essential for optimizing patient outcomes.

## Epidemiology and Mechanisms of Injury

The estimated annual incidence is 17,900 new cases per year in the United States. Motor vehicle accidents remain the leading cause, followed by falls, violence, and sports-related injuries. The cervical spine is the most commonly injured region, with C5 being the single most frequent level. The age distribution is bimodal, affecting young adults in trauma and the elderly in falls with pre-existing stenosis. Males are affected approximately four times more frequently than females.

## Initial Assessment and Primary Survey

### Prehospital Care

Strict spinal precautions are maintained with a rigid cervical collar and log-roll technique. Excessive traction or manipulation during extrication must be avoided. Transport should be directed to a designated trauma center with spine surgery capability.

### Emergency Department Evaluation

The ATLS protocol is followed, with airway, breathing, and circulation taking priority over spine evaluation. A thorough neurological examination is performed as soon as the patient is hemodynamically stable, documenting motor strength on a 0 to 5 scale, sensory levels by pinprick and light touch, and rectal tone. Classification follows the ASIA (American Spinal Injury Association) Impairment Scale.

## Classification Systems

### ASIA Impairment Scale

Grade A is a complete injury with no motor or sensory function below the level of injury, including the sacral segments. Grade B is sensory incomplete, with sensory but no motor function preserved below the level including the sacral segments. Grade C is motor incomplete, with motor function preserved below the level but more than half of key muscles grading less than 3. Grade D is motor incomplete with at least half of key muscles grading 3 or better. Grade E indicates normal motor and sensory function.

### Spinal Cord Syndromes

| Syndrome | Mechanism | Motor Deficit | Sensory Deficit | Prognosis |
|----------|-----------|---------------|-----------------|-----------|
| Central cord | Hyperextension in stenotic spine | UE > LE weakness | Variable | Best (most common incomplete SCI) |
| Anterior cord | Flexion/vascular | Complete motor loss below level | Loss of pain/temperature; preserved proprioception | Poor motor recovery |
| Brown-Sequard | Penetrating trauma/hemisection | Ipsilateral motor loss | Ipsilateral proprioception loss; contralateral pain/temp loss | Best motor prognosis |
| Conus medullaris | Injury at L1-L2 | LMN bladder/bowel; variable LE | Perianal sensory loss | Variable |
| Cauda equina | Below L2 | Asymmetric LMN; bladder retention | Asymmetric; saddle anesthesia | Variable (peripheral nerve recovery) |

Central cord syndrome presents with upper extremity weakness greater than lower extremity weakness and is the most common incomplete SCI. Anterior cord syndrome involves loss of motor function and pain/temperature sensation with preserved proprioception. Brown-Sequard syndrome produces ipsilateral motor and proprioception loss with contralateral pain and temperature loss. Conus medullaris syndrome causes lower motor neuron bladder and bowel dysfunction with variable lower extremity findings. Cauda equina syndrome presents with asymmetric lower motor neuron findings and bladder retention.

## Acute Medical Management

### Hemodynamic Support

Neurogenic shock must be distinguished from hemorrhagic shock: it is characterized by hypotension with bradycardia rather than tachycardia. The mean arterial pressure (MAP) should be maintained above 85 mmHg for the first 5 to 7 days to optimize spinal cord perfusion. Vasopressors (norepinephrine preferred) are used when volume resuscitation alone is insufficient.

### Respiratory Management

Injuries at C3 to C5 compromise diaphragmatic function, and the need for mechanical ventilation should be anticipated. Forced vital capacity and negative inspiratory force are monitored serially. Early tracheostomy may be indicated for high cervical injuries.

### Thromboprophylaxis

SCI patients are at extremely high risk for deep vein thrombosis and pulmonary embolism. Mechanical prophylaxis should be initiated immediately, with chemical prophylaxis started within 72 hours when safe.

## Surgical Decision-Making

### Timing of Surgery

Early surgical decompression within 24 hours is supported by the STASCIS trial for improved neurological outcomes in cervical SCI. Urgent intervention is indicated for progressive neurological deterioration, bilateral locked facets, or open injuries. Even fracture-dislocations with complete neurological injury benefit from early stabilization to facilitate mobilization.

### Goals of Surgical Intervention

The three goals are decompression of neural elements, reduction of malalignment, and stabilization to prevent further injury and facilitate rehabilitation.

### Surgical Approaches

Anterior approaches are used for disc herniations, corpectomies, and ventral compression. Posterior approaches address facet injuries, laminar fractures, and multisegmental stabilization. Combined anterior-posterior procedures are used for highly unstable injuries or complex deformities.

## Prognosis and Recovery

The ASIA grade at 72 hours is the strongest predictor of neurological recovery. ASIA A injuries have less than a 5% chance of meaningful motor recovery below the level of injury. ASIA B injuries convert to ASIA C or D in approximately 30% of cases. Patients with central cord syndrome have the most favorable prognosis among incomplete injuries. MRI findings of hemorrhage within the cord portend a poor prognosis, while isolated edema is more favorable. Maximum neurological recovery typically plateaus by 12 to 18 months post-injury.

## Clinical Pearls

Always distinguish neurogenic shock (hypotension with bradycardia) from hemorrhagic shock (hypotension with tachycardia) in the acute trauma setting. The ASIA examination at 72 hours post-injury is the most reliable prognostic indicator and should be documented meticulously. Early surgical decompression within 24 hours is associated with improved neurological outcomes and should be pursued when feasible. Central cord syndrome in elderly patients with pre-existing stenosis may present after a low-energy mechanism such as a ground-level fall, and a high index of suspicion must be maintained.

## References
1. Fehlings MG, Vaccaro A, Wilson JR, et al. Early versus delayed decompression for traumatic cervical spinal cord injury: results of the Surgical Timing in Acute Spinal Cord Injury Study (STASCIS). *PLoS One*. 2012;7(2):e32037.
2. Kirshblum SC, Burns SP, Biering-Sorensen F, et al. International standards for neurological classification of spinal cord injury (revised 2011). *J Spinal Cord Med*. 2011;34(6):535-546.
3. Walters BC, Hadley MN, Hurlbert RJ, et al. Guidelines for the management of acute cervical spine and spinal cord injuries: 2013 update. *Neurosurgery*. 2013;60(CN_suppl_1):82-91.
4. Ryken TC, Hurlbert RJ, Hadley MN, et al. The acute cardiopulmonary management of patients with cervical spinal cord injuries. *Neurosurgery*. 2013;72(suppl_3):84-92.