Posterior Transpedicular Dynamic Stabilization versus Total Disc Replacement in the Treatment of Lumbar Painful Degenerative Disc Disease: A Comparison of Clinical Results

Table 5

The comparison of SL (α) angles.

ALPHA		TDR (𝑛=25)	PTDS (𝑛=25)	^a𝑃
Preop ALPHA	Min–Max	4–17	4–30	0.274
	Mean ± SD	10.32±3.06	11.68±5.33
ALPHA (3 months)	Min–Max	3–19	3–33	0.566
	Mean ± SD	10.40±3.70	11.20±5.84
ALPHA (12 months)	Min–Max	4–16	2–31	0.392
	Mean ± SD	10.36±2.90	11.52±6.05
ALPHA (24 months)	Min–Max	5–14	3–30	0.248
	Mean ± SD	10.32±2.28	11.56±4.79
	^b𝑃	0.989	0.858

^aStudent’s 𝑡-test, ^brepeated measures test.
SL: segmental lordosis.