Biological vs. Biomechanical Path in Spinal Surgery: A Neurosurgical Perspective

Understanding the Biological Path

The biological path focuses on the molecular, cellular, and systemic processes that influence neurological and spinal health. This includes:

• Genetic mutations and connective tissue disorders (e.g., EDS)
• Inflammatory and autoimmune responses
• Neurodegenerative conditions
• Hormonal influences

For instance, patients with Ehlers-Danlos Syndrome often present with systemic connective tissue weakness. This biological fragility directly impacts ligamentous support, predisposing patients to CCI and AAI. In our clinic, besides the biomechanical testing (upright CBCT, lumbar prone MRI and neurophysiological assessment) we frequently evaluate these biological indicators through immunological and inflammatory panels, genetic testing, and comprehensive evaluations.

Exploring the Biomechanical Path

The biomechanical path analyzes the structural and kinetic dysfunctions within the spine, including the craniocervical area. It evaluates how load distribution, alignment, movement patterns, and gravitational forces contribute to spinal instability.

Common biomechanical dysfunctions include:

• CCI
• AAI
• Thoracic instability
• Lumbar instability
• Sacroiliac instability
• Hyperlordosis or kyphosis
• Tethered cord
• Scoliosis

Dr. Gilete and his team utilize upright CBCT, and 3D CT reconstructions to measure spinal angles and displacements under gravitational load. These tests, often overlooked in conventional neurosurgical settings, are essential to revealing instabilities that a standard supine MRI may miss.

Why Integration Matters: Dr Gilete’s Approach

In our experience, addressing only one path may lead to suboptimal results. For example, performing occipito-cervical fusion based solely on biomechanical imaging without understanding the possible underlying biological immune dysfunction weakness may result in addressing only a part of the problem (source). Conversely, focusing only on inflammation or immune dysregulation without stabilizing an unstable segment (if that is the case) can give a suboptimal outcome as per not treating the additional source of some symptoms.

Our integrated approach includes:

• Biological assessment: immune, hormonal, genetic, and inflammatory evaluation
• Biomechanical assessment: detailed analysis of instability through imaging and motion studies
• Customized treatment plans: surgery, regenerative therapy, immunomodulation, or all of them in combination

Case-Based Insight from Practice

Patients frequently come to us after years of misdiagnosis. One common profile is a person with chronic fatigue, dizziness, and severe neck pain whose supine MRI appears normal. Through dynamic upright imaging, we uncover CCI or AAI often missed elsewhere.

In one notable case, a patient presented with myalgic encephalomyelitis (ME/CFS), urinary dysfunction, and postural instability. While her previous physicians focused exclusively on fatigue management, we conducted a full biological and biomechanical workup. We diagnosed occult tethered cord and CCI, both treated surgically. Post-op follow-up revealed progressive symptom relief, allowing the patient to regain independence and mobility. In another case, not only the biomechanical surgical fixation of the instability led to an improvement, but also medical intervention for the immunological underlying condition.

Why This Matters for EDS Patients

EDS patients embody the perfect intersection of both worlds. Their biological vulnerability (faulty collagen and immune dysregulation in some cases as well as somehow a susceptibility to postviral & postinfectious syndromes) can translate into biomechanical failure (ligament laxity, instability). Surgery in these patients is complex and must be tailored to avoid over-fusion while ensuring sufficient stabilization.

Thanks to our experience as the only EDS Center of Excellence in Europe with surgical activity, we have pioneered surgical strategies and imaging protocols specifically adapted for this population.

Frequently Asked Questions (FAQs)

What is the biological path in spinal treatment?

 It refers to the approach that considers genetic, immunological, inflammatory, and systemic physiological causes affecting craniospinal health.

What is the biomechanical path?

It involves assessing mechanical forces, structural integrity, and movement-related abnormalities contributing to spinal dysfunction (instability).

Can both be addressed simultaneously?

Yes. In fact, optimal treatment often requires addressing both components for lasting relief and surgical success.

How do you assess biomechanical instability?

Through dynamic imaging (upright CBCT), and evaluation of movement under gravitational conditions.

Is surgery always necessary?

No. Surgery is a last resort. Biological therapies, regenerative medicine, and neuromodulation are considered first whenever possible.

Do EDS patients need a special protocol?

Absolutely. Their fragile tissue biology requires tailored immunological and surgical strategies, often combining minimal fusion with enhanced fixation techniques.

Conclusion

The dichotomy of biological vs. biomechanical is not a choice—it’s a clinical reality. At Promohealth SL, under the guidance of Dr. Vicenç Gilete, our interdisciplinary approach honors both paths to offer world-class care to complex spine patients.

If you suspect craniocervical or atlantoaxial instability, or suffer from conditions like EDS or ME/CFS, we invite you to contact our team. You may be just one integrated evaluation away from a life-changing diagnosis.