When maintenance personnel are on car roof, car running is absolutely prohibited, and so is the personnel's stepping on the non-weight bearing area of the car roof;

维保人员在轿顶时，绝对禁止轿厢的运行，绝对禁止维保人员踏足轿顶非承重部位；

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Materials and methods: Making the animal model of the longitudinal crack and horizontal defect on the weight-bearing area and non weight-bearing area of the medial femoral condyle on rabbit.

材料和方法：制做兔股骨内髁关节软骨负重区和非负重区纵行裂伤和水平缺损动物模型。

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