The knee joint is relatively unstable because there is no interlocking of bones in the joint.
膝关节是相对不稳定的,因为没有共同联锁骨骼的研究。
2
According to the introduction of Yingzao Fash, the joint method of Pubofang is Goutou Dazhang structure, much like the interlocking structure in modern times.
Therefore, we can deduce that the structure of Wooden Tower may exist the grooves-and-tongues joint structure which is close to the Interlocking structure in foreign countries.