Table 1.

Synovial fluid parameters in saline lavage and nonlavage aspirations based on infection status

Variable	Infected (n = 23 hips)	Not infected (n = 75 hips)	Mean difference (95% CI)	p Value
WBC count (cells/µL)
Saline lavage	782 ± 696 (n = 6)	307 ± 343 (n = 15)	475 (−253 to 1203)	0.161
Nonlavage	6680 ± 6980 (n = 17)	2001 ± 4825 (n = 60)	4679 (923–8436)	0.015
PMN percentage (%)
Saline lavage	67 ± 15 (n = 6)	58 ± 28 (n = 15)	10 (−11 to 30)	0.331
Nonlavage	83 ± 13 (n = 17)	44 ± 30 (n = 60)	39 (39–49)	< 0.001

Values = mean ± SD; WBC = white blood cell; PMN = polymorphonuclear cells.