Fig. 3: Development of "disc height" dh
(Mean and Standard Errors, dimensionless numbers) preoperatively (pre), postoperatively (post), and at follow-up (fu).
1: unfused cranial adjacent segment,
2: topmost fusion segment (only fused segment in case of one-level fusion),
3: second fusion segment (in case of two-level fusion),
4: unfused caudal adjacent segment.
Note temporary distraction and consecutive loss off correction in all segments. Adjacent segments start at a higher "baseline" than fusion segments.