Fig. 4From: Percutaneous endoscopic lumbar discectomy combined with platelet-rich plasma injection for lumbar disc herniation: analysis of clinical and imaging outcomesSchematic diagram of DHI measurement, DHI = [2(disc height)] / [(height of the upper vertebrae) + (height of the lower vertebrae)] *100%. Comparison of DHI on lumbar X-ray preoperatively (A), 3 months (B) and 12 months (C) postoperativelyBack to article page