PEEK Cages versus PMMA Spacers in Anterior Cervical Discectomy: Comparison of Fusion, Subsidence, Sagittal Alignment, and Clinical Outcome with a Minimum 1-Year Follow-Up

Table 2

Bony fusion, subsidence, and sagittal alignment.

	PEEK; cage	PMMA; Sulcem	PMMA; Palacos	Overall	𝑃; (cage versus Sulcem)	𝑃; (cage versus Palacos)	𝑃; (Sulcem versus Palacos)
Fused levels^∧	31/48 (64.6%)	28/49 (57.1%)	19/41 (46.3%)	78/138 (56.5%)	0.534	0.092	0.397
Fused patients^∧	23/37 (62.2%)	19/37 (51.3%)	13/31 (41.9%)	55/105 (52.4%)	0.482	0.143	0.474
Subsidence (mm)^#	2.3±2.8	2.6±3.1	2.3±2.9	2.4±3.0	0.647	0.948	0.721
Change in SSA^#	−4.1^∘±4.3^∘	−2.4^∘±6.2^∘	−1.0^∘±4.6^∘	−2.7°	0.129	0.003^∗	0.260
Change in CSA^#	−3.1^∘±10.1^∘	−5.2^∘±10.7^∘	−1.3^∘±10.0^∘	−3.6°	0.420	0.500	0.168

The table shows ratios of fused levels and fused patients as well as means with standard deviations of subsidence and change in segmental and cervical alignment.
SSA: segmental sagittal alignment.
CSA: cervical sagittal alignment.
^#Student's 𝑡-test (two-tailed).
^∧Fisher exact test (two-tailed).
^∗𝑃<0.05.