Objective To study the correlation between the anatomical parameters of knee joint and non-contact anterior cruciate ligament injury by propensity score matching. Methods Unilateral non-contact ACL injury patients (Nc-ACL group) who were treated in our hospital from July 2013 to July 2018 were selected. The control group was the patients who having knee joint injuries examined by MRI, but no abnormal anatomical structure of bone and soft tissue. The Nc-ACL group and the control group went propensity score matching in terms of age, gender, height and weight. Anatomical parameters of knee joint were measured on MIR: notch width index (NWI), notch shape index (NSI), lateral tibial plateau slope (LTS), medial tibial plateau slope (MTS), patellar tendon-tibial shaft angle (PTTSA). Results Total of 136 cases (136 knees) were enrolled in Nc-ACL group. In the control group, 358 cases (358 knees) were enrolled. The Nc-ACL group and the control group went propensity score matching in terms of age, gender, height and weight. The matching was completed with the method of same size ratio non-substituted nearest neighbor. The two groups were enrolled respectively into 68 cases (68 knees). NWI with statistical difference in Nc-ACL group was lower than that in control group (P<0.05). LTS, MT and PTTSA with statistical difference in Nc-ACL group were higher than those in control group (P<0.05). The NWI of male/female subgroup with statistical difference in Nc-ACL group was lower than that of male/female subgroup in control group (P<0.05). LTS, MT and PTTSA of male/female subgroup with statistical difference in Nc-ACL group were higher than those of male/female subgroup in control group (P<0.05). There was no statistical difference in the parameters of NWI, NSI, LTS, MT and PTTSA between male and female (P>0.05). The best truncation value of NWI was 0.261, sensitivity 64.94%, specificity 77.14%; LTS 9.11, sensitivity 89.66%, specificity 57.86%; MTS 8.84, sensitivity 70.11%, specificity 65.71%; PTTSA was 26.58, sensitivity 83.91%, specificity was 69.29%. Conclusions The abnormalities of NWI, MTS, LTS and PTTSA may be closely related to non-contact ACL injury. However, this conclusion needs more samples to be confirmed.
Key words
Knee joint; Anterior cruciate ligament; Anatomical parameters /
Injury /
Gender
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