Abstract：Objective To investigate the relationship between anatomical types of femoral neck fractures and degree of osteoporosis.Methods Fifty-eight specimens of postoperative femoral heads collected from July 2008 to December 2012 were enrolled in the research, including 24 males and 34 females with age ranging from 48 to 88 years (average 74.7 years) . All of the samples were classified according to anatomical classification firstly, and then Singh index classification was conducted through combining preoperative X-ray and specimens′ X-ray. The proportions of every anatomical type and degree of osteoporosis were explored. Lastly, the relationship between them was analyzed.Results Analysis of anatomical types showed that the proportion of head-neck type was 58.6%(34/58), the sub-head type was 19.0%(11/58), and a new type called "special type" was discovered, which accounted for 20.7%(12/58). The rest one case was undetermined type and there was no via-neck type. The analysis of Singh index revealed that samples below grade Ⅳ accounted for 94.8%(55/58), the grade V was 5.2%(3/58) and no case of grade Ⅵ was found. The proportions of sub-head type of femoral neck fractures were 6/8 and 10.0% (5/50), respectively, in ones whose Singh index were grades Ⅰ-Ⅱ and grades Ⅲ-Ⅴ, the difference was statistically significant (χ2=14,966, P＜0.01), while the proportions of head-neck type in the two groups were 1/8 and 66.0% (33/50),respectively , the difference was also statistically significant (χ2=6.082, P<0.05).Conclusions Head-neck type is the most common anatomical type of femoral neck fractures. The new anatomical type discovered in this research is tentatively called "special type", whose peripheral fracture surface locates below the femoral head and the central part of compressive trabecular bone stretches into distance of the femoral neck, with a relatively blunt tip. Patients, whose Singh index of grade Ⅳ or below are prone to suffer from femoral neck fractures, while those of grades Ⅴ and Ⅵ are not. The anatomical types of femoral neck fractures are closely related to the degree of osteoporosis, sub-head type often occurs in ones whose Singh index are grades Ⅰ-Ⅱ, while typical head-neck type in grades Ⅲ-Ⅴ more easily.
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Xu Kailiang, Du Xinru. Research of the relationship between anatomical types of femoral neck fractures and degree of osteoporosis. Chinese Journal of Anatomy and Clinics, 2015, 20(4): 330-334.
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