Active ankylosing spondylitis increases blood loss during total hip arthroplasty for a stiff hip joint

Table 2 Laboratory values, ASDAS, operation time and hemostatic

	Stable disease group	Active disease group	P
ASDAS	0.97 ± 0.20	2.55 ± 0.90	< 0.001^*
Preoperative CRP (mg/L)	3.04 ± 1.30	16.59 ± 11.91	< 0.001^*
Preoperative ESR (mm/1 h)	10.82 ± 5.92	30.37 ± 20.16	< 0.001^*
Preoperative Hb(g/L)	142.18 ± 13.03	132.41 ± 16.50	0.040
Preoperative Fbgc(g/L)	3.29 ± 8.18	3.77 ± 0.74	0.045
Preoperative ALB (g/L)	40.40 ± 2.68	38.59 ± 4.06	0.048^*
Preoperative Hct (L/L)	0.421 ± 0.033	0.406 ± 0.041	0.200
Preoperative Plt(× 10⁹/L)	246.00 ± 67.86	277.62 ± 80.79	0.176
Preoperative PT(s)	12.48 ± 0.97	11.90 ± 1.07	0.071
Preoperative PT%	85.04 ± 13.03	92.65 ± 17.45	0.122
Preoperative PT-INR()	1.08 ± 0.10	1.03 ± 0.10	0.083
Preoperative APTT(s)	33.63 ± 3.09	32.61 ± 3.19	0.122
Preoperative TT(s)	17.22 ± 1.51	16.97 ± 1.95	0.651
Operation time (min)	93.53 ± 18.83	97.47 ± 32.80	0.925^*
Osteoporosis in imaging (Y/N)	11/6	28/4	0.067^†
The strategy of using hemostatic(a/b/c/d)	7/3/4/3	14/8/3/7	0.585^†

^* non-parametric rank sum test, ^†chi-square test with Fisher’s exact test, the rest- Student t-test;
a- “neither of HCA or TXA was used” b- “only HCA was used”,
c- “only TXA was used” d- “both of HCA and TXA were used”

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