Transforaminal Endoscopic Lumbar Discectomy with versus without Platelet-Rich Plasma Injection for Lumbar Disc Herniation: A Prospective Cohort Study

Figure 5

Comparison of disc protrusion size on PRP group preoperatively (a), at 3 days (b), and at 1 year after operation (c), which was measured by drawing a line at base of the disc and then a perpendicular line was drawn from the first line to the most protruded point on MRI.