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Axially dynamic implants for stabilization of the cervical spine
Michael P Steinmetz1, Edward C Benzel, Ronald I Apfelbaum
1Department of Neurosurgery, Cleveland Clinic Spine Institute, Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA.
Neurosurgery
|October 17, 2006
Summary
Dynamic cervical spine implants allow natural subsidence, promoting better bone healing and reducing implant failures. This load-sharing approach leads to more robust and earlier spinal fusions compared to rigid instrumentation.
Area of Science:
- Spine Surgery
- Biomechanical Engineering
- Orthopedic Research
Background:
- Spinal subsidence is a natural process during aging and post-surgery.
- Rigid cervical spine instrumentation can impede natural subsidence, leading to increased load on implants.
- This can result in higher rates of construct failures and pseudoarthrosis.
Purpose of the Study:
- To evaluate the efficacy of dynamic implants in cervical spine stabilization.
- To compare the outcomes of dynamic versus rigid instrumentation regarding subsidence and fusion rates.
Main Methods:
- Dynamic implants were utilized, allowing natural subsidence while preventing excessive spinal movement.
- Axially dynamic implants facilitate load sharing between the implant and bone graft.
- This approach works synergistically with natural bone healing biology.
Main Results:
- Dynamic implants have been associated with diminished incidences of construct failures.
- Load sharing promotes more robust and earlier spinal fusions.
Conclusions:
- Dynamic implants represent a preferred system for ventral cervical stabilization in select patients.
- They offer improved outcomes by accommodating natural subsidence and enhancing load sharing.
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