Risk factor analysis for delayed union after subtrochanteric femur fracture: quality of reduction and valgization are the key to success

Table 1 Baseline Characteristics and radio-morphometric measurement results

N = 61	Group I (uncomplicated healing)			Group II (delayed union)			Level of significance	Total
Age at time of injury in years	54.27 ± 16.34			58.51 ± 20.06			p = 0.381	56.7 ± 18.54
BMI at time of injury	26.9 ± 4.1			28.42 ± 6.65			p = 0.336	27.79 ± 5.75
Grade of Quality of reduction (Baumgaertner)	I	II	III	I	II	III	p = 0.022^*
Grade of Quality of reduction (Baumgaertner)	30.8%	50.0%	19.2%	11.4%	60.0%	28.6%	p = 0.022^*
Postoperative ventral dislocation of the proximal fragment in mm (x)	5.5 ± 5.7			7.74 ± 5.48			p = 0.155	6.27 ± 5.39
Postoperative lateral dislocation of the proximal fragment in mm (y)	6.62 ± 6.83			6.0 ± 4.05			p = 0.686	6.12 ± 5.40
Ipsilateral CCD-angle (β) (postoperative)	127.46 ± 6.24			123.23 ± 7.05			p = 0.019^*	125.06 ± 6.98
Contralateral CCD-angle in ° (β‘)	131.21 ± 5.91			128.66 ± 6.06			p = 0.106	129.75 ± 6.09
Tip-Apex-Distance postoperative in mm	24.87 ± 9.37			28.81 ± 13.91			p = 0.256	27.14 ± 12.25
RUSH-Score at 6 months postoperative	25.15 ± 2.78			17.63 ± 2.34			p = 0.001^*	21.32 ± 4.57
Leg-length shortening at 6 months postoperative in mm	1.06 ± 1.3			4.07 ± 8.14			p = 0.193	2.42 ± 5.65

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