Vertebral column development and its relation to adult pathology

Area of Science:

• Spinal Anatomy and Biomechanics
• Developmental Biology
• Orthopedics

Background:

• Intervertebral disc weakness results from notochordal and vascular attrition, predisposing to intravertebral prolapse.
• Vertebral development exhibits asymmetry, influencing spinal alignment and potentially contributing to pain.
• Age-related changes in spinal joint structure affect biomechanical stability and stress distribution.

Purpose of the Study:

• To investigate the mechanisms behind intervertebral disc prolapse and associated somatic spinal pain.
• To explore the role of asymmetrical vertebral growth in spinal development and alignment.
• To analyze the functional changes in spinal joints (Luschka's and zygapophyseal) throughout development and their impact on disc protection and biomechanics.

Main Methods:

• Analysis of normal notochordal and vascular attrition in intervertebral discs.
• Observation of asymmetrical and asynchronous growth patterns in vertebral arches.
• Examination of the developmental changes and orientation of cervical and lumbar zygapophyseal joints.

Main Results:

• Weak spots in intervertebral discs facilitate intravertebral prolapse, a cause of spinal pain.
• Asymmetrical vertebral growth leads to rotational changes in thoracic vertebral bodies during development.
• Development of Luschka's joints in the cervical spine offers some protection against posterolateral disc prolapse, while lumbar zygapophyseal joints adapt to restrain rotation and excessive flexion with age.

Conclusions:

• Normal attrition processes create vulnerabilities in intervertebral discs, leading to prolapse and pain.
• Developmental asymmetry in vertebral growth is a key factor in spinal alignment.
• The evolving structure of zygapophyseal joints throughout life is crucial for spinal stability and managing age-related stress.