Effection of monoplanar pedicle screw on facet joint degeneration in thoracolumbar vertebral fractures

Table 7 Summary of ABCI measured by X-ray

		FAPS group	P Value	MPPS group	P Value
ABCI (%)	Pre-op	57.1 ± 11.2	< 0.001^a	53.3 ± 8.7	< 0.001^c
	Immediate post-op	89.2 ± 10.3	/	88.1 ± 9.1	/
	12–18 months post-op	89.0 ± 11.0	> 0.5^b	86.3 ± 8.9	> 0.1^d

ABCI anterior body compression index, FAPS fixed-axis pedicle screw, MPPS monoplanar pedicle screw
^aRepresents a significant difference from immediate post-op in FAPS group(P < 0.001)
^bRepresents no significant difference from immediate post-op in FAPS group (P > 0.5)
^cRepresents a significant difference from immediate post-op in MPPS group (P < 0.001)
^dRepresents no significant difference from immediate post-op in MPPS group (P > 0.1)

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