Vacuum phenomenon as a predictor of kyphosis after implant removal following posterior pedicle screw fixation without fusion for thoracolumbar burst fracture: a single-center retrospective study

Table 4 Loss of correction

	Loss of correction		OR	95% CI	P value
	(+); n = 35	(−); n = 25	OR	95% CI	P value
Old age	3	2	3.8	0.5–30.6	0.21
Female	10	21	0.5	0.2–1.7	0.27
Initial severe kyphosis	16	23	1.7	0.5–6.0	0.45
Severe wedge deformity	5	8	0.9	0.2–3.8	0.90
Vacuum phenomenon	15	14	3.9	1.2–13.1	0.03

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