Department of Mechanical Engineering, University of British Columbia, Vancouver, Canada.
J Arthroplasty. 2010 Aug;25(5):793-802. doi: 10.1016/j.arth.2009.04.023. Epub 2009 Jul 29.
The optimal amount of patellar component medialization in knee arthroplasty is unknown. We measured the impact, on patellofemoral kinematics and contact force distribution, of 0.0-, 2.5-, and 5.0-mm patellar component medialization in 7 cadaveric specimens implanted with knee arthroplasty components. The knees were flexed dynamically in a weight-bearing rig. Medialization led to lateral shift of the patellar bone, slight medial shift of the patellar component in the femoral groove, lateral tilt of the patella, reduced patellofemoral contact force in later flexion, and lateral shift of the center of pressure in early flexion. Effects on shift and tilt were proportional to the amount of medialization. As a result of this investigation, we recommend medializing the patellar component slightly-on the order of 2.5 mm.
膝关节置换术中髌骨组件的最佳内侧化量尚不清楚。我们在 7 个植入膝关节置换组件的尸体标本中测量了髌骨组件内侧化 0.0、2.5 和 5.0 毫米对髌股运动学和接触力分布的影响。膝关节在负重架上进行动态弯曲。内侧化导致髌骨外侧移位，髌骨组件在股骨沟中轻微内侧移位，髌骨外侧倾斜，后期弯曲时髌股接触力减小，早期弯曲时压力中心向外侧移位。移位和倾斜的效果与内侧化的量成正比。基于这项研究的结果，我们建议将髌骨组件轻微地内侧化-大约 2.5 毫米。
