导航监测下股骨旋转角度及胫骨截骨后内翻角度对下肢动态力线的影响

doi:10.19739/j.cnki.issn1001-9510.2020.02.005

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Abstract Objective To simulate total knee arthroplasty under the monitoring of the computer navigation system, and to observe the effects of different femoral prosthesis rotation angle and tibia varus angle on the mechanical axis alignment. Methods Total knee arthroplasty was performed on synthetic lower limb using computer navigation system. Mechanical axes at 0°,30°,60°and 90° were calculated when 0°,3°and 5° tibia varus under different femoral prosthesis malrotation, respectively, and the change trend and rule were obtained. Results Under the condition of insufficient external rotation of femoral prosthesis, the mechanical axis varus angle of lower limbs decreased with the increase of varus angle after tibial osteotomy(P＜0.05 or ＜0.01). In the case of insufficient external rotation of the femoral prosthesis, the varus angle of the lower limb gradually decreased within the interval of 0°～90° for the same posterior varus angle of the tibial osteotomy(P＜0.05). In the case of excessive external rotation of the femoral prosthesis, the varus angle of the lower limb increased with the gradual increase of the varus angle after the tibial osteotomy(P＜0.05 or ＜0.01). In the case of excessive external rotation of the femoral prosthesis, the varus angle of the lower extremity gradually increased within 0°～90° at the same posterior varus angle of the tibial osteotomy(P＜0.05). Conclusion Rotational alignment for femoral prosthesis and tibia varus were important factors in the achievement of accurate mechanical axis alignment.

Key words： total knee arthroplasty dynamic line of force of lower limb computer navigation system

Received: 28 June 2019

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R687.3

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	Articles by authors
	LIU Dan
	KONG Gang
	MA Weihua
	WANG Zhaojie

Cite this article:

LIU Dan,KONG Gang,MA Weihua, et al. Analysisi of the influence of femoral prosthesis rotation angle and tibia varus angle after tibial osteotomy on the mechanical axis alignment after computer-navigated assisted TKA[J]. 滨州医学院学报, 2020, 43(2): 101-104.

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http://manu58.magtech.com.cn/Jwk_bzyxy/EN/10.19739/j.cnki.issn1001-9510.2020.02.005 OR http://manu58.magtech.com.cn/Jwk_bzyxy/EN/Y2020/V43/I2/101

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