Intervertebral Disc Rehydration after Lumbar Dynamic Stabilization: Magnetic Resonance Image Evaluation with a Mean Followup of Four Years

Table 2

Distribution of treated levels.

Instrumentation	Level	Number of patients
1-level (𝑛=31)	L3-4	3 (4.2%)
	L4-5	23 (31.9%)
	L5-S1	5 (6.9%)
2-levels (𝑛=41)	L2-3-4	1 (1.4%)
	L3-4-5	33 (45.8%)
	L4-5-S1	7 (9.7%)