Thoracic and lumbar spine trauma classification systems fail to predict post-traumatic kyphotic deformity

Area of Science:

• Orthopedic Surgery
• Radiology
• Spine Trauma

Background:

• Post-traumatic kyphosis of the thoracic and lumbar spine can lead to significant pain and functional impairment.
• Magnetic Resonance Imaging (MRI) is often used to evaluate ligamentous integrity and the risk of developing kyphosis following spinal trauma.

Purpose of the Study:

• To investigate the predictive value of current classification systems and MRI-based assessment of posterior ligamentous complex (PLC) integrity in the development of post-traumatic kyphosis.
• To analyze the relationship between injury characteristics and the progression of kyphotic deformity.

Main Methods:

• Retrospective review of thoracic and lumbar spine MRIs and follow-up radiographs from trauma patients.
• Classification of injuries using Denis, TLICS, AO, and load sharing systems by two independent observers.
• Measurement of kyphosis changes and comparison with initial radiology reports.

Main Results:

• Kyphosis (≥10°) developed in a significant proportion of cases, irrespective of PLC integrity (intact, partially injured, or completely disrupted).
• Development of kyphosis was observed even in cases with an intact PLC, particularly with multi-vertebral involvement or anterior longitudinal ligament (ALL) injury.
• High interobserver variability was noted in assessing ligamentous injury severity on MRI.

Conclusions:

• Current classification systems for thoracic and lumbar spine injuries are insufficient to predict the risk of post-traumatic kyphosis.
• Integrity of the posterior ligamentous complex (PLC), as assessed by MRI, does not reliably predict the development of post-traumatic kyphotic deformity.