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Minimally invasive cervical expansile laminoplasty: an initial cadaveric study
Michael Y Wang1, Barth A Green, Ernesto Coscarella
1Department of Neurological Surgery, University of Miami, Miami, Florida, USA. myw@usc.edu
Neurosurgery
|January 22, 2003
Summary
A novel minimally invasive laminoplasty technique in cadavers successfully expanded the cervical spinal canal. This approach may reduce muscle dissection, potentially decreasing postoperative neck pain and kyphosis after cervical surgery.
Area of Science:
- Neurosurgery
- Orthopedic Surgery
- Spinal Surgery
Background:
- Expansile laminoplasty is a standard treatment for cervical myelopathy due to spinal stenosis.
- Posterior cervical muscle detachment during traditional laminoplasty may lead to axial neck pain and kyphosis.
- Minimizing muscle dissection is a potential strategy to mitigate these adverse outcomes.
Purpose of the Study:
- To evaluate the feasibility of a minimally invasive laminoplasty technique in human cadavers.
- To assess the potential for reducing muscular dissection compared to conventional methods.
Main Methods:
- A minimally invasive laminoplasty was performed on six human cadaveric spines using a tubular dilator port.
- Access was gained through bilateral stab incisions (C4-C5, C5-C6) to reach lamina-facet junctions (C2-C7).
- Laminae were lifted en bloc after bilateral trough drilling, with rib allograft spacers used to maintain the gap.
Main Results:
- The technique allowed exposure of six cervical levels via two small bilateral incisions.
- Drilling was performed without dural violations.
- Significant increases in spinal canal dimensions were observed: mean midsagittal diameter increased by 38% and mean canal area by 43% at C5.
Conclusions:
- A minimally invasive cervical laminoplasty approach is feasible in human cadavers.
- The demonstrated expansion of the spinal canal space aligns with findings associated with neurological improvement or stabilization.