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Abstract Objective To investigate the biomechanics of fibula osteotomy and the mechanism of treating knee osteoarthritis.Methods Three healthy adult lower limb specimens were obtained，2 male specimens and 1 female specimen，aged 30，33 and 40 years，respectively.Including 2 right knee joints and 1 left knee joint.The pressure load of the four quadrants of the anterior and posterior tibiofemoral compartment of the fibula was measured with a film pressure sensor manufactured by takscan company under a longitudinal load of 800 N.Results The results showed that the pressure distribution in the knee joint was uneven，but had similar rules.The pressure in the posterolateral quadrant was the largest，followed by the anterior inner quadrant.The total pressure of the lateral platform was greater than that of the medial，and the pressure in the anterolateral and posteromedial quadrants was the smallest.After fibular osteotomy，the pressure in the anterior inner quadrant and the anterior outer quadrant decreased，but the pressure in the posterior outer quadrant was greater，and the pressure in the posterior inner quadrant also increased.Conclusion Fibular osteotomy can reduce the medial pressure of knee joint and can be used for the treatment of knee varus arthritis.The medial pain of knee arthritis can be relieved or disappear after fibula osteotomy.However，adaptive rehabilitation training should be carried out after operation to make the knee joint adapt to the new load distribution and prevent the disease from repeating or aggravating caused by the increase of tibial load after fibula osteotomy.
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