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The cutoff value of ossification of posterior longitudinal ligament (OPLL) for early diagnosis of myelopathy using somatosensory evoked potential in cervical OPLL patients

 S Y Yoon  ;  T H Park  ;  N L Eun  ;  Y G Park 
 SPINAL CORD, Vol.55(6) : 606-611, 2017 
Journal Title
Issue Date
Early Diagnosis ; Evoked Potentials, Somatosensory* ; Female ; Humans ; Male ; Median Nerve/physiopathology ; Middle Aged ; Ossification of Posterior Longitudinal Ligament/complications ; Ossification of Posterior Longitudinal Ligament/diagnostic imaging* ; Ossification of Posterior Longitudinal Ligament/physiopathology* ; Retrospective Studies ; Sensitivity and Specificity ; Spinal Cord/diagnostic imaging ; Spinal Cord Diseases/complications ; Spinal Cord Diseases/diagnosis* ; Spinal Cord Diseases/physiopathology* ; Tibial Nerve/physiopathology ; Tomography, X-Ray Computed
STUDY DESIGN: Retrospective study.

OBJECTIVES: The objective of this study was to find out whether ossification of posterior longitudinal ligament (OPLL) characteristics, including size, shape and subtype, can be used to diagnose myelopathy using somatosensory evoked potential (SEP) in cervical OPLL patients.

SETTING: Yonsei University College of Medicine, Seoul, Korea.

METHODS: We retrospectively reviewed the medical records of 153 cervical OPLL patients who underwent SEP study. OPLL anterior-posterior (AP) diameter, area and involved longitudinal vertebral level were measured. OPLL was classified into subtypes according to longitudinal continuity and shape. Correlation analysis and receiver operating curve were used.

RESULTS: Tibial SEP latency was significantly correlated with OPLL AP diameter (P=0.001), diameter occupying ratio (P=0.019), area (P=0.007), area occupying ratio (P=0.008), involved longitudinal vertebral level (P=0.028) and space available for the spinal cord (P=0.019). The cutoff values that were diagnostic for SEP prolongation suggesting myelopathy were 4.91 mm for OPLL AP diameter, 6.02 mm for space available for the spinal cord, 44.5% for diameter occupying ratio, 63.4 mm2 for area, 36.1% for area occupying ratio and level 2 for the involved longitudinal vertebral level.

CONCLUSIONS: Our results revealed that tibial SEP latency was significantly correlated with OPLL size and suggested cutoff values of OPLL diameter (4.91 mm, 44.5%) and area (63.4 mm2, 36.1%) for early diagnosis of myelopathy. These results can help to establish treatment plans.
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1. College of Medicine (의과대학) > Dept. of Rehabilitation Medicine (재활의학교실) > 1. Journal Papers
Yonsei Authors
Park, Yoon Ghil(박윤길) ORCID logo https://orcid.org/0000-0001-9054-5300
Eun, Na Lae(은나래) ORCID logo https://orcid.org/0000-0002-7299-3051
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