The Effect of Lumbar Lordosis on Screw Loosening in Dynesys Dynamic Stabilization: Four-Year Follow-Up with Computed Tomography

Table 5

The comparison outcome of total patients and patients over 2-year follow-up.

	Number of patients	Follow-up (months)		Rate of loosening; per patient (%)	Rate of loosening; per screw (%)
		Clinical	Radiological
All patients	291	46.4 ± 22.7	32.6 ± 21.2	21.3	8.4
Follow-up >2 years	206	51.1 ± 20.8	40.7 ± 19.7	20.4	8.2