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Segmental motor paralysis after expansive open-door laminoplasty
Kazuhiro Chiba1, Yoshiaki Toyama, Morio Matsumoto
1Department of Orthopaedic Surgery, School of Medicine, Keio University, Tokyo, Japan. kchiba@sc.itc.keio.ac.jp
Spine
|October 24, 2002
Summary
Segmental motor paralysis after cervical laminoplasty may stem from spinal cord gray matter impairment, not just nerve root issues. This finding offers new insights into postoperative complications and recovery.
Area of Science:
- Neurosurgery
- Spinal Cord Pathology
- Cervical Myelopathy
Background:
- Segmental motor paralysis post-expansive open-door laminoplasty for cervical myelopathy is uncommon.
- Traditionally attributed to nerve root injury or spinal cord tethering.
- Spinal cord pathology is an under-explored mechanism in existing literature.
Observation:
- A retrospective study analyzed 15 patients with post-laminoplasty segmental motor paralysis.
- Paralysis predominantly affected C5, often on the hinge side, with delayed onset (average 4.6 days).
- Preoperative severe hand numbness/dysesthesia was common, with lower recovery rates for sensory disturbance.
Findings:
- Postoperative MRI revealed T2 high-signal intensity zones in the spinal cord in all affected patients.
- These signal abnormalities correlated with paralyzed segments in most cases.
- Complete paralysis resolution occurred in 11 out of 15 patients.
Implications:
- The findings suggest spinal cord gray matter impairment as a potential cause of segmental motor paralysis.
- This challenges traditional explanations focusing solely on nerve root involvement.
- Understanding this mechanism can improve diagnostic and therapeutic strategies for post-laminoplasty complications.