Effect of different locations of necrotic focus on the natural course of non-traumatic osteonecrosis of the femoral head

doi:10.12307/2024.010

Abstract

Abstract: BACKGROUND: For non-traumatic osteonecrosis of the femoral head, if the femoral head collapses, it will have a great impact on the normal life of the patients. Thus, it is necessary to use an appropriate way to evaluate the risk of femoral head collapse and then to take targeted measures to delay the process of femoral head collapse.
OBJECTIVE: To analyze the natural course of early osteonecrosis of the femoral head (without collapse) under different locations of necrotic lesions.
METHODS: 121 patients (191 hips) with early non-traumatic osteonecrosis of the femoral head who were treated in the Outpatient Department of Honghui Hospital Affiliated to Xi’an Jiaotong University from October 2016 to October 2017 were enrolled in this study. The clinical data of all patients were followed up for 5 years to observe the collapse of osteonecrosis of the femoral head and the risk coefficient of femoral head collapse among different JIC types. The collapse rate of osteonecrosis of the femoral head was calculated during the follow-up.
RESULTS AND CONCLUSION: (1) A total of 191 hips were included in this study. The femoral head collapsed in 86 hips during follow-up, with a total collapse rate of 45.0%. Among the influencing factors, age, ARCO stage and JIC classification were the main influencing factors of femoral head collapse (P < 0.05), but body mass index, sex, incidence side and pathogenic factors were not the main influencing factors (P > 0.05). (2) Among 191 hips, in JIC classification, the total collapse rates of type A, type B, type C1 and type C2 were 11.1%(2/18), 30.2%(16/53), 52.4%(43/82), and 65.8%(25/38), respectively. There were significant differences in the total collapse rate of the femoral head among all types (P < 0.05). The collapse risk results showed that the collapse risk of type B, type C1 and type C2 was 2.41, 5.22 and 7.89 times higher than that of type A, respectively. (3) Both JIC classification and ARCO stage were correlated with femoral head collapse (P < 0.01). There was no significant difference in the collapse rate of the femoral head among all JIC types in ARCO I stage hips (P > 0.05). In the hips with ARCO II stage, the collapse rates of the femoral head of JIC types A, B, C1 and C2 were 1.2%, 19.5%, 50.0% and 29.3%, respectively, and there were significant differences in the collapse rates among different types (P < 0.05). (4) During follow-up, the collapse rates of the femoral head in the first to fifth years were 29.3%, 7.9%, 4.7%, 2.6% and 0.5%, respectively. (5) Results showed that for early non-traumatic osteonecrosis of the femoral head, the risk of collapse of osteonecrosis of the femoral head is high within one year, and the location of the focus of osteonecrosis affects the risk of collapse of the femoral head. The effect of the location of the focus on the prognosis of the disease should be considered in clinical treatment.

Key words: non-traumatic osteonecrosis of the femoral head, femoral head collapse, focus location, JIC classification, natural course

CLC Number:

Zhao Rushun, Hao Yangquan, Xu Peng, Zheng Xin, Jiang Yonghong, Zhang Yuting, Wang Mengfei, Lu Chao. Effect of different locations of necrotic focus on the natural course of non-traumatic osteonecrosis of the femoral head[J]. Chinese Journal of Tissue Engineering Research, 2024, 28(6): 917-921.

Figures/Tables 4

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