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目的：探讨胫骨前肌肌腱在膝关节置换术胫骨髓外定位系统的作用。方法59例行膝关节置换术中患者的59个下肢，用X线定位胫骨冠状位力线以及踝关节中点，并在皮肤上标志，标志胫骨前肌肌腱内侧缘纵轴，在内、外踝连线上测量胫骨前肌肌腱内侧缘距离踝关节中点的距离，测量胫骨力线与胫骨前肌肌腱交点到内、外踝连线距离，并用独立t检验做统计学分析。结果胫骨前肌肌腱内侧缘在内、外踝连线上与踝关节中点距离为(13.32±2.75) mm，胫骨前肌与胫骨力线交点与内外踝连线距离(71.23±6.45) mm，均有统计学意义(P<0.001)。结论胫骨前肌肌腱在胫骨远端有2个可以作为膝关节置换术中髓外定位系统中胫骨远端解剖标记，具有实际应用价值。“,”Objective To explore the effect of the tibialis anterior tendon in the total knee arthroplasty of the extramedullary alignment. Methods The ankle center and the tibial coronal alignment in 59 lower limbs of the 59 osteoarthritis were confirmed with X-ray and was marked in the skin, the medial border of tibialis anterior tendon was also marked in the skin. The distance of the tibialis anterior tendon to the ankle center was measured at the ankle line, the distance of junction of tibialis anterior tendon and tibial coronal alignment to the ankle line also was measured. The independent t test was performed for both distances. Results The distance of the tibialis anterior tendon to the ankle center was (13.32±2.75) mm (P<0.001), and the distance of the junction of the tibialis anterior tendon and the tibial alignment to the ankle line was (71.23 ± 6.45) mm (P<0.001). Conclusion The tibialis anterior tendon has 2 points that could serve as the distal tibial anatomical landmark in extramedullary alignment of total knee arthroplasty, it could be applied in the total knee arthroplasty clinically.