Risk modeling of femoral neck fracture based on geometric parameters of the proximal epiphysis

Table 1 Values of the geometric parameters of the proximal epiphysis of the femur

	Range	Mean value	Standard deviation	Standard error	Coefficient of variation
Neck-shaft angle (degrees)	103-144	125.99	9.09	1.08	0.07
Angle of the minimal resistance zone (degrees)	14-36	23.90	5.67	0.67	0.24
АС	32.3-61.48	48.60	7.10	0.84	0.15
АВ	17.94-57.3	38.61	10.05	1.19	0.26
ВС	55.51-94.42	78.00	8.66	1.03	0.11
Upper neck length	14.19-33.79	21.44	5.09	0.60	0.24
Lower neck length	21.72-45.94	33.67	5.19	0.62	0.15

Table 2 Scale for determining the risk of femoral neck base fractures according to the morphometric parameters

	Neck-shaft angle	Angle of minimal resistance zone	The ratio of the top and bottom neck lengths
1 point	130.24 and more	14 and less	0.56 and less
2 points	127.5-130.24	18.95-29.95	0.57-0.74
3 points	Less than 127.5	More than 29.95	0.75 and more