The quadriceps contracts, pulling on the patella which is connected to the tibia by the patellar tendon. The force of this contraction brings the knee into extension.
四头肌缩短，连接胫骨髌腱拉动髌骨上拉。这收缩的力量带来膝进入延长。
The quadriceps contracts, pulling on the patella which is connected to the tibia by the patellar tendon. The force of this contraction brings the knee into extension.
四头肌缩短，连接胫骨髌腱拉动髌骨上拉。这收缩的力量带来膝进入延长。
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