The Meyerding classification grades lumbar spondylolisthesis based on the percentage of slip of one vertebra over the next. A Meyerding Grade III slip corresponds to:
- A 0–25% slip
- B 26–50% slip
- C 51–75% slip ✓
- D 76–100% slip
Correct answer: C. 51–75% slip
Explanation
Meyerding grading of spondylolisthesis: Grade I = 0–25%; Grade II = 26–50%; Grade III = 51–75%; Grade IV = 76–100%; Grade V (spondyloptosis) = >100% (complete dislocation, vertebral body falls anterior to the sacrum). Grades I–II are typically managed conservatively or with in-situ fusion; Grades III–IV often require reduction and instrumented posterior fusion, particularly when there is neurological compromise.
Reference: Maheshwari Essential Orthopaedics, 6th ed.
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Written and medically reviewed by the StethoPrep medical team.