In Vitro Comparison of Dynesys, PEEK, and Titanium Constructs in the Lumbar Spine

Table 2

Reduction in ROM at L4-L5 compared to previous studies.

Reduction in ROM normalized to intact
	Flex.	Ext.	LB	AT
DSS-FEM	51%	40%	30%	29%
DSS	54%	39%	45%	70%
DSS^†	55%		46%	41%
DYN	57%		48%	−5%
DYN^†	66%		60%	5%
PEEK	61%		53%	20%
TI	64%		66%	27%
RR	74%	62%	71%	26%
RR^†	71%		76%	58%
RR-FEM	76%	66%	62%	48%

Indicating treatment from Schmidt et al. [26]; ^†indicating treatment from Schilling et al. [13]; DSS-FEM = predicted dynamic stabilization from finite element model; DSS = Dynamic Stabilization System; DYN = Dynesys; TI = Titanium rod; RR = rigid rod; RR-FEM = predicted rigid stabilization from finite element model.