The visible and hidden blood loss of Asia proximal femoral nail anti-rotation and dynamic hip screw in the treatment of intertrochanteric fractures of elderly high- risk patients: a retrospective comparative study with a minimum 3 years of follow-up

Table 4 The hidden and visible blood loss of PFNA-II and DHS in the treatment of inter-trochanter fracture (x ± s)

	Number	Operation time (min)	Intraoperation bleed (ml)	Postoperation drainage (ml)	Hidden blood loss (ml)	Visible blood loss (ml)	Total blood loss (ml)
PFNA-II^a
Male	81	34.1 ± 1.2	33.0 ± 1.8	53.6 ± 2.1	272.9 ± 6.9	86.6 ± 2.6	359.5 ± 7.0
Female	105	36.5 ± 0.3*	36.0 ± 2.2*	55.6 ± 2.4*	280.5 ± 6.3*	91.6 ± 3.5*	372.1 ± 7.3*
Total	186	35.5 ± 1.4	34.7 ± 2.5	54.7 ± 2.5	277.2 ± 7.6	89.4 ± 4.0	366.6 ± 9.5
DHS^b
Male	80	49.9 ± 0.6	100.0 ± 4.3	77.6 ± 3.9	133.0 ± 7.0	177.6 ± 5.6	310.5 ± 9.2
Female	97	52.1 ± 1.1*	103.7 ± 8.3*	79.7 ± 5.1*	144.6 ± 8.1*	183.5 ± 10.3*	328.1 ± 14.2*
Total	177	51.1 ± 1.4^#	102.0 ± 7.0 ^#	78.8 ± 4.7^#	139.3 ± 9.6^#	180.8 ± 9.0^#	320.1 ± 15.0^#

PFNA-II Asia proximal femoral nail anti-rotation; DHS Dynamic hip screw. *p < 0.01, the male patients vs. the female patients in the same group; ^#p < 0.01 total patients in Group PFNA-II vs. total patients in Group DHS. Visible blood loss = Intra operation bleed + Post operation drainage. ^aSmith & Nephew, Memphis, Tennessee; ^bSynthes, West Chester, PA, USA

ISSN: 1471-2474