OPLL 

Backgound 

• Idiopathic anomaly 
• Asian 
• Dx lateral X, CT to quantifyy 
• C4-C6 
• RF 
  • DM 
  • Obesity 
  • Asian 
  • Hyperparathyroidism 
  • Hypophophatemic rickets 
  • hyperinsulinemia 
  • High salt low meat diet 
  • Mechanical stress oon PLL 

RF for Developing Myelopathy 

• >60% stenosis (occupancy ratio) 
• <6mm SAC 
• Increase cervical ROM 
• OPLL laterally deviated in spinal canal 

K Line 

• Developed for OPLL oiginally 
• If OPLL is behind K line, then need to do anteriror 

Types 

• Solitary 
• Segmental 
• Continuous 
• Mixed 

Management 

• Same analysis as ceviacl myelopathy (kyphosis, K line) 
• Anteriror 
  • Just leave the OPLL attached and allow it to FLOAT