Spinal Balance/Alignment - Clinical Relevance and Biomechanics

Area of Science:

• Spine biomechanics
• Orthopedic surgery
• Spinal deformities

Background:

• The spine's natural curvature (C7 plumb line) centers the head over the pelvis for optimal balance and minimal muscular activity.
• Deformities like scoliosis, kyphosis, trauma, or surgery disrupt this alignment, increasing muscular effort and potentially causing pain.
• Parameters such as thoracic kyphosis, lumbar lordosis, and pelvic incidence significantly influence sagittal balance.

Purpose of the Study:

• To review the clinical aspects and biomechanics of spinal imbalance.
• To examine the impact of spinal deformities (ankylosing spondylitis, scoliosis, kyphosis) on sagittal balance.
• To discuss surgical corrections and associated postural complications.

Main Methods:

• Literature review focusing on spinal biomechanics, deformities, and surgical interventions.
• Analysis of clinical parameters influencing spinal alignment.
• Examination of compensatory mechanisms and quality of life impacts.

Main Results:

• Global sagittal imbalance is energetically costly and leads to compensatory mechanisms that impair quality of life.
• Deformities and surgical interventions significantly alter spinal biomechanics and alignment.
• Postural complications like proximal and distal junctional kyphosis can arise after surgical corrections.

Conclusions:

• Understanding the biomechanics of spinal balance is critical for managing spinal deformities.
• Surgical corrections, while necessary, can introduce new challenges like junctional kyphosis.
• Further research is needed to optimize spinal alignment and improve patient outcomes.