In Meyerding grading of spondylolisthesis, a Grade IV slip means the vertebral body has slipped forward by:
- A 26–50% of the AP diameter of the subjacent vertebra
- B 51–75% of the AP diameter
- C 76–100% of the AP diameter ✓
- D Complete forward displacement off the subjacent vertebra (spondyloptosis)
Correct answer: C. 76–100% of the AP diameter
Explanation
Meyerding classification divides the AP dimension of the subjacent vertebral body into four equal quarters: Grade I = 0–25% slip; Grade II = 26–50%; Grade III = 51–75%; Grade IV = 76–100%. Spondyloptosis (Grade V) refers to complete anterior displacement of the vertebral body off the sacrum/next vertebra. High-grade spondylolisthesis (Grades III–IV) typically requires surgical reduction and fusion. This classification applies most commonly to L5-S1 isthmic spondylolisthesis.
Reference: Maheshwari Essential Orthopaedics, 6th ed.
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Written and medically reviewed by the StethoPrep medical team.