Objective To analyze the value of CT scanning imaging in morphological analysis of bone blocks embedded in the posterior ankle joint.Methods The clinical data of 129 patients with ankle fracture involving the posterior malleolus diagnosed in our hospital from January 2018 to December 2022 were retrospectively analyzed.According to whether there is intraarticular impacted fragment(IAIF)in the posterior ankle fracture block during CT examination,it is divided into an IAIF group and a non IAIF group.Use CT scanning to measure the area of the posterior ankle fracture block,the length of the affected tibiofibular notch,the length and area of the IAIF,as well as the area of the stable tibia block,the stable tibia length,and the distance from the IAIF to the joint movement.The location of IAIF was described and involvement of the fibular notch and inner ankle was observed.Spearman correlation analysis were used to analyze the correlation between IAIF area and other clinical parameters.Results Among the 129 cases of posterior ankle fractures,90 patients(69.76％)had IAIF.There were differences in the distribution of Haraguchi and Mason subtypes between IAIF and non IAIF patients(P＜0.05).IAIF patients had a higher proportion of medial malleolus involvement(P=0.008),a higher proportion of tibiofibular notch involvement(P=0.011),a longer length of posterior malleolus fracture mass(P=0.004),and a larger area of posterior malleolus fracture mass(P=0.010).59 patients(65.56％)had IAIF distributed in the lateral tibial region.Using Spearman correlation analysis,it can be seen that there is a certain correlation between the area of AIF and the area of the posterior ankle fracture block(rs=-0.408,P=0.037).Conclusion The most common location of IAIF is in the lateral tibial region.When the posterior malleolus fracture line extends to the medial malleolus or tibiofibular notch,it indicates a higher risk of IAIF.
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万方数据