Is Sarcopenia a Risk Factor for Postoperative Surgical Site Infection After Posterior Lumbar Spinal Fusion?

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Table

Baseline characteristic differences for high vs low PLVI groups and for infected vs noninfected groups.

Characteristics	Total	Low PLVI <0.74	High PLVI ≥0.74	P Value	Noninfected	Infected	P Value
n	304	154	150		280	24
Age at surgery, y, mean ± SD	64 ± 5.9	64.6 ± 6.0	63.6 ± 5.9	0.273	63.9 ± 5.8	66.2 ± 7.0	0.096
Gender, M/F	149/155	47/107	104/46	<0.001	136/144	13/11	0.599
Body mass index, mean ± SD	26.8 ± 3.5	25.2 ± 4.3	28.1 ± 3.5	0.313	25 ± 4.7	27.2 ± 4.0	0.202
Diabetes mellitus, n	26	12	14	0.631	22	4	0.139
Smoking history, n	68	36	32	0.670	60	8	0.058
Charlson Comorbidity Index, mean ± SD	2.5 ± 1.3	2.8 ± 1.6	2.3 ± 1.0	0.218	2.4 ± 1.2	3.6 ± 1.9	0.008
American Society of Anesthesiology score, mean ± SD	2.0 ± 0.6	2.1 ± 0.6	2.0 ± 0.6	0.663	2 ± 0.5	2.4 ± 0.8	0.017
Length of stay, d, mean ± SD	7.3 ± 5.6	9.9 ± 8.6	7.9 ± 3.8	0.625	9.7 ± 4.7	12.7 ± 13.5	0.075
Operative time, min, mean ± SD	191.4 ± 60.2	185 ± 62.5	197.4 ± 57.3	0.232	188.9 ± 60.0	214 ± 58.7	0.138
Infection, n (%)	24 (7.9%)	12 (7.8%)	12 (8%)	0.947
PLVI, mean ± SD	0.74 ± 0.2	0.56 ± 0.1	0.85 ± 0.1	<0.001	0.75 ± 0.2	0.73 ± 0.2	0.686
PLVI, low/high , n	154/150				142/138	12/12	0.947